diff --git a/package.json b/package.json
index b89ac90f..4dbe6ed3 100644
--- a/package.json
+++ b/package.json
@@ -49,6 +49,7 @@
     "i18next": "23.14.0",
     "i18next-browser-languagedetector": "8.0.0",
     "i18next-http-backend": "2.6.1",
+    "jsonrepair": "3.8.0",
     "material-ui-popup-state": "5.3.1",
     "mui-nested-menu": "3.4.0",
     "p-limit": "6.1.0",
diff --git a/public/locales/en.json b/public/locales/en.json
index b8f6897d..707a676c 100644
--- a/public/locales/en.json
+++ b/public/locales/en.json
@@ -328,6 +328,7 @@
       "restore": "Restore",
       "resume": "Resume",
       "retry": "Retry",
+      "save": "Save",
       "select": "Select",
       "select_all": "Select all",
       "set": "Set",
@@ -818,18 +819,48 @@
       }
     },
     "appearance": {
-      "device_theme": "Device theme",
-      "pure_black_mode": "Pure black dark mode",
-      "theme": "Theme",
-      "themes": {
-        "crimson": "Crimson",
-        "dune": "Dune",
-        "forest_dew": "Forest dew",
-        "lavendar": "Lavendar",
-        "minty_miracles": "Minty Miracles",
-        "mountain_sunset": "Mountain sunset",
-        "orange_juice": "Orange juice",
-        "rosegold": "Rosegold"
+      "theme": {
+        "create": {
+          "action": "Creating theme…",
+          "dialog": {
+            "error": {
+              "invalid_json": "Invalid json",
+              "invalid_name": "The theme name must be unique and has a limit of 16 characters"
+            },
+            "info": {
+              "creating_theme": "Create a custom theme with the <2>MUI Theme Creator</2>, copy everything after \"themeOptions\" from \"{\" to \"}\" and paste it into the \"theme\" text field.",
+              "theme_mode_lock": "In case the \"mode\" is defined in the \"palette\" object, the theme will be locked into this mode and will not change regardless of the apps device theme"
+            },
+            "theme_name": "Name"
+          },
+          "failure": "Could not create theme",
+          "success": "Created theme",
+          "title": "Create theme"
+        },
+        "delete": {
+          "action": "Deleting theme \"{{theme}}\"…",
+          "failure": "Could not delete theme \"{{theme}}\"",
+          "success": "Deleted theme \"{{theme}}\""
+        },
+        "device_theme": "Device theme",
+        "edit": {
+          "action": "Saving theme changes…",
+          "failure": "Could not save theme changes",
+          "success": "Saved theme changes",
+          "title": "Edit theme"
+        },
+        "pure_black_mode": "Pure black dark mode",
+        "themes": {
+          "crimson": "Crimson",
+          "dune": "Dune",
+          "forest_dew": "Forest dew",
+          "lavender": "Lavender",
+          "minty_miracles": "Minty Miracles",
+          "mountain_sunset": "Mountain sunset",
+          "orange_juice": "Orange juice",
+          "rosegold": "Rosegold"
+        },
+        "title": "Theme"
       },
       "title": "Appearance"
     },
diff --git a/src/App.tsx b/src/App.tsx
index 7e6becd6..8c121887 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -46,7 +46,7 @@ const { DeviceSetting } = loadable(() => import('@/components/settings/DeviceSet
 const { TrackingSettings } = loadable(() => import('@/screens/settings/TrackingSettings.tsx'), lazyLoadFallback);
 const { TrackerOAuthLogin } = loadable(() => import('@/screens/TrackerOAuthLogin.tsx'), lazyLoadFallback);
 const { LibraryDuplicates } = loadable(() => import('@/screens/settings/LibraryDuplicates.tsx'), lazyLoadFallback);
-const { Appearance } = loadable(() => import('@/screens/settings/Appearance.tsx'), lazyLoadFallback);
+const { Appearance } = loadable(() => import('@/screens/settings/appearance/Appearance.tsx'), lazyLoadFallback);
 
 if (process.env.NODE_ENV !== 'production') {
     // Adds messages only in a dev environment
diff --git a/src/components/context/AppContext.tsx b/src/components/context/AppContext.tsx
index 51ef3a82..59d2c84b 100644
--- a/src/components/context/AppContext.tsx
+++ b/src/components/context/AppContext.tsx
@@ -23,7 +23,8 @@ import { NavBarContextProvider } from '@/components/navbar/NavBarContextProvider
 import { LibraryOptionsContextProvider } from '@/components/library/LibraryOptionsProvider';
 import { ActiveDevice, DEFAULT_DEVICE, setActiveDevice } from '@/util/device.ts';
 import { MediaQuery } from '@/lib/ui/MediaQuery.tsx';
-import { AppThemes } from '@/lib/ui/AppThemes.ts';
+import { AppThemes, getTheme } from '@/lib/ui/AppThemes.ts';
+import { useMetadataServerSettings } from '@/lib/metadata/metadataServerSettings.ts';
 
 interface Props {
     children: React.ReactNode;
@@ -50,6 +51,10 @@ export const AppContext: React.FC<Props> = ({ children }) => {
         directionRef.current = currentDirection;
     }
 
+    const {
+        settings: { customThemes },
+    } = useMetadataServerSettings();
+
     const [systemThemeMode, setSystemThemeMode] = useState<ThemeMode>(MediaQuery.getSystemThemeMode());
     useLayoutEffect(() => {
         const unsubscribe = MediaQuery.listenToSystemThemeChange(setSystemThemeMode);
@@ -80,8 +85,8 @@ export const AppContext: React.FC<Props> = ({ children }) => {
     );
 
     const theme = useMemo(
-        () => createAndSetTheme(themeMode, appTheme, pureBlackMode, currentDirection),
-        [themeMode, currentDirection, systemThemeMode, pureBlackMode, appTheme],
+        () => createAndSetTheme(themeMode, getTheme(appTheme, customThemes), pureBlackMode, currentDirection),
+        [themeMode, currentDirection, systemThemeMode, pureBlackMode, appTheme, customThemes],
     );
 
     setActiveDevice(activeDevice);
diff --git a/src/lib/metadata/metadata.ts b/src/lib/metadata/metadata.ts
index 7a01e5c0..22bbe958 100644
--- a/src/lib/metadata/metadata.ts
+++ b/src/lib/metadata/metadata.ts
@@ -57,6 +57,9 @@ const GLOBAL_METADATA_KEYS: AppMetadataKeys[] = [
 
     // sources
     'savedSearches',
+
+    // themes
+    'customThemes',
 ];
 
 /**
diff --git a/src/lib/metadata/metadataServerSettings.ts b/src/lib/metadata/metadataServerSettings.ts
index 3ffb464d..615938d7 100644
--- a/src/lib/metadata/metadataServerSettings.ts
+++ b/src/lib/metadata/metadataServerSettings.ts
@@ -12,6 +12,7 @@ import {
     Metadata,
     MetadataServerSettingKeys,
     MetadataServerSettings,
+    MetadataThemeSettings,
 } from '@/typings.ts';
 import { requestManager } from '@/lib/requests/RequestManager.ts';
 import { convertFromGqlMeta, getMetadataFrom, requestUpdateServerMetadata } from '@/lib/metadata/metadata.ts';
@@ -50,6 +51,9 @@ export const getDefaultSettings = (): MetadataServerSettings => ({
     // updates
     webUIInformAvailableUpdate: true,
     serverInformAvailableUpdate: true,
+
+    // themes
+    customThemes: {},
 });
 
 export const convertSettingsToMetadata = (
@@ -57,6 +61,7 @@ export const convertSettingsToMetadata = (
 ): Metadata<string, AllowedMetadataValueTypes> => ({
     ...settings,
     devices: JSON.stringify(settings.devices),
+    customThemes: JSON.stringify(settings.customThemes),
 });
 
 export const convertMetadataToSettings = (
@@ -66,6 +71,9 @@ export const convertMetadataToSettings = (
         ...getDefaultSettings(),
         ...(metadata as unknown as MetadataServerSettings),
         devices: jsonSaveParse<string[]>((metadata.devices as string) ?? '') ?? getDefaultSettings().devices,
+        customThemes:
+            jsonSaveParse<MetadataThemeSettings['customThemes']>((metadata.customThemes as string) ?? '') ??
+            getDefaultSettings().customThemes,
     }) satisfies MetadataServerSettings;
 
 const getMetadataServerSettingsWithDefaultFallback = (
diff --git a/src/lib/ui/AppThemes.ts b/src/lib/ui/AppThemes.ts
index 703cb1d4..28390cd7 100644
--- a/src/lib/ui/AppThemes.ts
+++ b/src/lib/ui/AppThemes.ts
@@ -6,120 +6,165 @@
  * file, You can obtain one at https://mozilla.org/MPL/2.0/.
  */
 
-import { PaletteOptions } from '@mui/material/styles';
+import { ThemeOptions } from '@mui/material/styles';
 import { t as translate } from 'i18next';
+import { defaultPromiseErrorHandler } from '@/util/defaultPromiseErrorHandler.ts';
 
-type Theme = { getName: () => string; palette: PaletteOptions };
+type Theme = { isCustom: boolean; getName: () => string; muiTheme: ThemeOptions };
 
 const themes = {
     default: {
+        isCustom: false,
         getName: () => translate('global.label.default'),
-        palette: {
-            primary: {
-                main: '#5b74ef',
-            },
-            secondary: {
-                main: '#efd65b',
+        muiTheme: {
+            palette: {
+                primary: {
+                    main: '#5b74ef',
+                },
+                secondary: {
+                    main: '#efd65b',
+                },
             },
         },
     },
     lavender: {
-        getName: () => translate('settings.appearance.themes.lavendar'),
-        palette: {
-            primary: {
-                main: '#5c58dc',
-            },
-            secondary: {
-                main: '#d8dc58',
+        isCustom: false,
+        getName: () => translate('settings.appearance.theme.themes.lavender'),
+        muiTheme: {
+            palette: {
+                primary: {
+                    main: '#5c58dc',
+                },
+                secondary: {
+                    main: '#d8dc58',
+                },
             },
         },
     },
     dune: {
-        getName: () => translate('settings.appearance.themes.dune'),
-        palette: {
-            primary: {
-                main: '#897869',
-            },
-            secondary: {
-                main: '#697a89',
+        isCustom: false,
+        getName: () => translate('settings.appearance.theme.themes.dune'),
+        muiTheme: {
+            palette: {
+                primary: {
+                    main: '#897869',
+                },
+                secondary: {
+                    main: '#697a89',
+                },
             },
         },
     },
     rosegold: {
-        getName: () => translate('settings.appearance.themes.rosegold'),
-        palette: {
-            primary: {
-                main: '#f1a886',
-            },
-            secondary: {
-                main: '#86cff1',
+        isCustom: false,
+        getName: () => translate('settings.appearance.theme.themes.rosegold'),
+        muiTheme: {
+            palette: {
+                primary: {
+                    main: '#f1a886',
+                },
+                secondary: {
+                    main: '#86cff1',
+                },
             },
         },
     },
-    forestDew: {
-        getName: () => translate('settings.appearance.themes.forest_dew'),
-        palette: {
-            primary: {
-                main: '#53a584',
-            },
-            secondary: {
-                main: '#a55374',
+    'forest dew': {
+        isCustom: false,
+        getName: () => translate('settings.appearance.theme.themes.forest_dew'),
+        muiTheme: {
+            palette: {
+                primary: {
+                    main: '#53a584',
+                },
+                secondary: {
+                    main: '#a55374',
+                },
             },
         },
     },
-    mountainSunset: {
-        getName: () => translate('settings.appearance.themes.mountain_sunset'),
-        palette: {
-            primary: {
-                main: '#c55a77',
-            },
-            secondary: {
-                main: '#5ac5a8',
+    'montain sunset': {
+        isCustom: false,
+        getName: () => translate('settings.appearance.theme.themes.mountain_sunset'),
+        muiTheme: {
+            palette: {
+                primary: {
+                    main: '#c55a77',
+                },
+                secondary: {
+                    main: '#5ac5a8',
+                },
             },
         },
     },
     crimson: {
-        getName: () => translate('settings.appearance.themes.crimson'),
-        palette: {
-            primary: {
-                main: '#ff0033',
-            },
-            secondary: {
-                main: '#00ffcc',
+        isCustom: false,
+        getName: () => translate('settings.appearance.theme.themes.crimson'),
+        muiTheme: {
+            palette: {
+                primary: {
+                    main: '#ff0033',
+                },
+                secondary: {
+                    main: '#00ffcc',
+                },
             },
         },
     },
-    mintyMiracles: {
-        getName: () => translate('settings.appearance.themes.minty_miracles'),
-        palette: {
-            primary: {
-                main: '#9defc3',
-            },
-            secondary: {
-                main: '#ef9dc9',
+    'minty miracles': {
+        isCustom: false,
+        getName: () => translate('settings.appearance.theme.themes.minty_miracles'),
+        muiTheme: {
+            palette: {
+                primary: {
+                    main: '#9defc3',
+                },
+                secondary: {
+                    main: '#ef9dc9',
+                },
             },
         },
     },
-    orangeJuice: {
-        getName: () => translate('settings.appearance.themes.orange_juice'),
-        palette: {
-            primary: {
-                main: '#ffb546',
-            },
-            secondary: {
-                main: '#4690ff',
+    'orange juice': {
+        isCustom: false,
+        getName: () => translate('settings.appearance.theme.themes.orange_juice'),
+        muiTheme: {
+            palette: {
+                primary: {
+                    main: '#ffb546',
+                },
+                secondary: {
+                    main: '#4690ff',
+                },
             },
         },
     },
 } as const satisfies Record<string, Theme>;
 
-export type AppThemes = keyof typeof themes;
+export type AppThemes = keyof typeof themes | string;
 
-export type AppTheme = Theme & { id: AppThemes };
+export type AppTheme = Theme & { id: AppThemes; isCustom: boolean };
 
 export const appThemes = (Object.entries(themes) as [AppThemes, Theme][]).map(([id, theme]) => ({
     id,
     ...theme,
 })) satisfies AppTheme[];
 
-export const getTheme = (id: AppThemes): AppTheme => ({ id, ...themes[id] });
+export const getTheme = (id: AppThemes, customThemes: Record<string, AppTheme> = {}): AppTheme => {
+    try {
+        const allThemes = { ...themes, ...customThemes };
+        const theme = (allThemes[id as keyof typeof themes] as AppTheme) ?? themes.default;
+
+        return {
+            // @ts-ignore - custom themes do not have a "getName" function
+            getName: () => id,
+            ...theme,
+        };
+    } catch (e) {
+        defaultPromiseErrorHandler('getTheme')(e);
+    }
+    return { id, ...themes[id as keyof typeof themes] };
+};
+
+export const isThemeNameUnique = (id: string, customThemes: Record<string, AppTheme>): boolean =>
+    Object.keys({ ...themes, ...customThemes }).every((themeId) => themeId.toLowerCase() !== id.toLowerCase());
diff --git a/src/screens/settings/Appearance.tsx b/src/screens/settings/Appearance.tsx
deleted file mode 100644
index ee0654af..00000000
--- a/src/screens/settings/Appearance.tsx
+++ /dev/null
@@ -1,262 +0,0 @@
-/*
- * Copyright (C) Contributors to the Suwayomi project
- *
- * This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at https://mozilla.org/MPL/2.0/.
- */
-
-import { useTranslation } from 'react-i18next';
-import { useContext, useEffect, useMemo } from 'react';
-import List from '@mui/material/List';
-import ListItem from '@mui/material/ListItem';
-import ListItemText from '@mui/material/ListItemText';
-import MenuItem from '@mui/material/MenuItem';
-import ListSubheader from '@mui/material/ListSubheader';
-import Switch from '@mui/material/Switch';
-import Link from '@mui/material/Link';
-import Box from '@mui/material/Box';
-import Typography from '@mui/material/Typography';
-import Stack from '@mui/material/Stack';
-import { styled, ThemeProvider } from '@mui/material/styles';
-import CheckCircleIcon from '@mui/icons-material/CheckCircle';
-import Card from '@mui/material/Card';
-import CardActionArea from '@mui/material/CardActionArea';
-import { NavBarContext } from '@/components/context/NavbarContext.tsx';
-import { ThemeMode, ThemeModeContext } from '@/components/context/ThemeModeContext.tsx';
-import { Select } from '@/components/atoms/Select.tsx';
-import { MediaQuery } from '@/lib/ui/MediaQuery.tsx';
-import { NumberSetting } from '@/components/settings/NumberSetting.tsx';
-import { useLocalStorage } from '@/util/useStorage.tsx';
-import { I18nResourceCode, i18nResources } from '@/i18n';
-import { langCodeToName } from '@/util/language.tsx';
-import { AppTheme, appThemes } from '@/lib/ui/AppThemes.ts';
-import { createTheme } from '@/theme.ts';
-
-const ThemePreviewBadge = styled(Box)(({ theme }) => ({
-    width: '15px',
-    height: '20px',
-    borderRadius: theme.shape.borderRadius,
-}));
-
-const ThemePreview = ({ theme }: { theme: AppTheme }) => {
-    const { getName } = theme;
-
-    const { themeMode, setAppTheme, appTheme, pureBlackMode } = useContext(ThemeModeContext);
-
-    const isSelected = theme.id === appTheme;
-
-    const muiTheme = useMemo(
-        () => createTheme(themeMode, theme.id, pureBlackMode),
-        [theme.id, themeMode, pureBlackMode],
-    );
-
-    return (
-        <Stack
-            sx={{
-                padding: 1,
-                justifyContent: 'center',
-                alignItems: 'center',
-                minWidth: '150px',
-                maxWidth: '150px',
-                gap: 1,
-            }}
-        >
-            <ThemeProvider theme={muiTheme}>
-                <Card
-                    sx={{
-                        width: '100%',
-                        height: '225px',
-                        outline: '4px solid',
-                        outlineColor: isSelected ? muiTheme.palette.primary.light : muiTheme.palette.background.paper,
-                        borderRadius: 1,
-                        p: 0,
-                    }}
-                >
-                    <CardActionArea
-                        sx={{ height: '100%', backgroundColor: 'background.default' }}
-                        onClick={() => setAppTheme(theme.id)}
-                    >
-                        <Stack sx={{ height: '100%' }}>
-                            <Stack sx={{ height: '100%', gap: 2, p: 1 }}>
-                                <Stack
-                                    sx={{
-                                        maxHeight: '20px',
-                                        flexDirection: 'row',
-                                        justifyContent: 'space-between',
-                                        alignItems: 'center',
-                                    }}
-                                >
-                                    <Box
-                                        sx={{
-                                            width: '65%',
-                                            height: '20px',
-                                            backgroundColor: 'primary.dark',
-                                            borderRadius: 1,
-                                        }}
-                                    />
-                                    {isSelected && (
-                                        <CheckCircleIcon
-                                            sx={{
-                                                visibility: isSelected ? 'visible' : 'hidden',
-                                                color: 'primary.light',
-                                            }}
-                                        />
-                                    )}
-                                </Stack>
-                                <Stack
-                                    sx={{
-                                        flexDirection: 'row',
-                                        width: '55%',
-                                        height: '65%',
-                                        backgroundColor: 'background.paper',
-                                        borderRadius: 1,
-                                        p: 1,
-                                    }}
-                                >
-                                    <ThemePreviewBadge sx={{ backgroundColor: 'primary.main' }} />
-                                    <ThemePreviewBadge sx={{ backgroundColor: 'secondary.main' }} />
-                                </Stack>
-                            </Stack>
-                            <Stack
-                                sx={{
-                                    height: '80px',
-                                    backgroundColor: muiTheme.palette.background.paper,
-                                    justifyContent: 'center',
-                                    alignItems: 'center',
-                                    flexDirection: 'row',
-                                    gap: 1,
-                                }}
-                            >
-                                <Box
-                                    sx={{
-                                        width: '20px',
-                                        height: '20px',
-                                        borderRadius: '50%',
-                                        backgroundColor: 'primary.main',
-                                    }}
-                                />
-                                <Box
-                                    sx={{
-                                        flexGrow: 0.75,
-                                        height: '20px',
-                                        borderRadius: 1,
-                                        backgroundColor: 'primary.light',
-                                    }}
-                                />
-                            </Stack>
-                        </Stack>
-                    </CardActionArea>
-                </Card>
-            </ThemeProvider>
-            <Typography>{getName()}</Typography>
-        </Stack>
-    );
-};
-
-const ThemePicker = () => (
-    <Stack sx={{ flexDirection: 'row', flexWrap: 'no-wrap', overflowX: 'auto', gap: 3, mx: 1 }}>
-        {appThemes.map((theme) => (
-            <ThemePreview key={theme.id} theme={theme} />
-        ))}
-    </Stack>
-);
-
-export const Appearance = () => {
-    const { t, i18n } = useTranslation();
-    const { themeMode, setThemeMode, pureBlackMode, setPureBlackMode } = useContext(ThemeModeContext);
-    const isDarkMode = MediaQuery.getThemeMode() === ThemeMode.DARK;
-
-    const { setTitle, setAction } = useContext(NavBarContext);
-    useEffect(() => {
-        setTitle(t('settings.appearance.title'));
-        setAction(null);
-
-        return () => {
-            setTitle('');
-            setAction(null);
-        };
-    }, [t]);
-
-    const DEFAULT_ITEM_WIDTH = 300;
-    const [itemWidth, setItemWidth] = useLocalStorage<number>('ItemWidth', DEFAULT_ITEM_WIDTH);
-
-    return (
-        <List
-            subheader={
-                <ListSubheader component="div" id="appearance-theme">
-                    {t('settings.appearance.theme')}
-                </ListSubheader>
-            }
-        >
-            <ListItem>
-                <ListItemText primary={t('settings.appearance.device_theme')} />
-                <Select<ThemeMode> value={themeMode} onChange={(e) => setThemeMode(e.target.value as ThemeMode)}>
-                    <MenuItem key={ThemeMode.SYSTEM} value={ThemeMode.SYSTEM}>
-                        System
-                    </MenuItem>
-                    <MenuItem key={ThemeMode.DARK} value={ThemeMode.DARK}>
-                        Dark
-                    </MenuItem>
-                    <MenuItem key={ThemeMode.LIGHT} value={ThemeMode.LIGHT}>
-                        Light
-                    </MenuItem>
-                </Select>
-            </ListItem>
-            <ThemePicker />
-            {isDarkMode && (
-                <ListItem>
-                    <ListItemText primary={t('settings.appearance.pure_black_mode')} />
-                    <Switch checked={pureBlackMode} onChange={(_, enabled) => setPureBlackMode(enabled)} />
-                </ListItem>
-            )}
-            <List
-                subheader={
-                    <ListSubheader component="div" id="appearance-theme">
-                        {t('global.label.display')}
-                    </ListSubheader>
-                }
-            >
-                <ListItem>
-                    <ListItemText
-                        primary={t('global.language.label.language')}
-                        secondary={
-                            <>
-                                <span>{t('settings.label.language_description')} </span>
-                                <Link
-                                    href="https://hosted.weblate.org/projects/suwayomi/suwayomi-webui"
-                                    target="_blank"
-                                    rel="noreferrer"
-                                >
-                                    {t('global.language.title.weblate')}
-                                </Link>
-                            </>
-                        }
-                    />
-                    <Select
-                        value={i18nResources.includes(i18n.language as I18nResourceCode) ? i18n.language : 'en'}
-                        onChange={({ target: { value: language } }) => i18n.changeLanguage(language)}
-                    >
-                        {i18nResources.map((language) => (
-                            <MenuItem key={language} value={language}>
-                                {langCodeToName(language)}
-                            </MenuItem>
-                        ))}
-                    </Select>
-                </ListItem>
-                <NumberSetting
-                    settingTitle={t('settings.label.manga_item_width')}
-                    settingValue={`px: ${itemWidth}`}
-                    value={itemWidth}
-                    defaultValue={DEFAULT_ITEM_WIDTH}
-                    minValue={100}
-                    maxValue={1000}
-                    stepSize={10}
-                    valueUnit="px"
-                    showSlider
-                    handleUpdate={setItemWidth}
-                />
-            </List>
-        </List>
-    );
-};
diff --git a/src/screens/settings/appearance/Appearance.tsx b/src/screens/settings/appearance/Appearance.tsx
new file mode 100644
index 00000000..218eb871
--- /dev/null
+++ b/src/screens/settings/appearance/Appearance.tsx
@@ -0,0 +1,127 @@
+/*
+ * Copyright (C) Contributors to the Suwayomi project
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
+import { useTranslation } from 'react-i18next';
+import { useContext, useEffect } from 'react';
+import List from '@mui/material/List';
+import ListItem from '@mui/material/ListItem';
+import ListItemText from '@mui/material/ListItemText';
+import MenuItem from '@mui/material/MenuItem';
+import ListSubheader from '@mui/material/ListSubheader';
+import Switch from '@mui/material/Switch';
+import Link from '@mui/material/Link';
+import { NavBarContext } from '@/components/context/NavbarContext.tsx';
+import { ThemeMode, ThemeModeContext } from '@/components/context/ThemeModeContext.tsx';
+import { Select } from '@/components/atoms/Select.tsx';
+import { MediaQuery } from '@/lib/ui/MediaQuery.tsx';
+import { NumberSetting } from '@/components/settings/NumberSetting.tsx';
+import { useLocalStorage } from '@/util/useStorage.tsx';
+import { I18nResourceCode, i18nResources } from '@/i18n';
+import { langCodeToName } from '@/util/language.tsx';
+import { getTheme } from '@/lib/ui/AppThemes.ts';
+import { ThemeList } from '@/screens/settings/appearance/theme/ThemeList.tsx';
+
+export const Appearance = () => {
+    const { t, i18n } = useTranslation();
+    const { themeMode, setThemeMode, pureBlackMode, setPureBlackMode, appTheme } = useContext(ThemeModeContext);
+    const isDarkMode =
+        getTheme(appTheme).muiTheme.palette?.mode === 'dark' || MediaQuery.getThemeMode() === ThemeMode.DARK;
+
+    const { setTitle, setAction } = useContext(NavBarContext);
+    useEffect(() => {
+        setTitle(t('settings.appearance.title'));
+        setAction(null);
+
+        return () => {
+            setTitle('');
+            setAction(null);
+        };
+    }, [t]);
+
+    const DEFAULT_ITEM_WIDTH = 300;
+    const [itemWidth, setItemWidth] = useLocalStorage<number>('ItemWidth', DEFAULT_ITEM_WIDTH);
+
+    return (
+        <List
+            subheader={
+                <ListSubheader component="div" id="appearance-theme">
+                    {t('settings.appearance.theme.title')}
+                </ListSubheader>
+            }
+        >
+            <ListItem>
+                <ListItemText primary={t('settings.appearance.theme.device_theme')} />
+                <Select<ThemeMode> value={themeMode} onChange={(e) => setThemeMode(e.target.value as ThemeMode)}>
+                    <MenuItem key={ThemeMode.SYSTEM} value={ThemeMode.SYSTEM}>
+                        System
+                    </MenuItem>
+                    <MenuItem key={ThemeMode.DARK} value={ThemeMode.DARK}>
+                        Dark
+                    </MenuItem>
+                    <MenuItem key={ThemeMode.LIGHT} value={ThemeMode.LIGHT}>
+                        Light
+                    </MenuItem>
+                </Select>
+            </ListItem>
+            <ThemeList />
+            {isDarkMode && (
+                <ListItem>
+                    <ListItemText primary={t('settings.appearance.theme.pure_black_mode')} />
+                    <Switch checked={pureBlackMode} onChange={(_, enabled) => setPureBlackMode(enabled)} />
+                </ListItem>
+            )}
+            <List
+                subheader={
+                    <ListSubheader component="div" id="appearance-theme">
+                        {t('global.label.display')}
+                    </ListSubheader>
+                }
+            >
+                <ListItem>
+                    <ListItemText
+                        primary={t('global.language.label.language')}
+                        secondary={
+                            <>
+                                <span>{t('settings.label.language_description')} </span>
+                                <Link
+                                    href="https://hosted.weblate.org/projects/suwayomi/suwayomi-webui"
+                                    target="_blank"
+                                    rel="noreferrer"
+                                >
+                                    {t('global.language.title.weblate')}
+                                </Link>
+                            </>
+                        }
+                    />
+                    <Select
+                        value={i18nResources.includes(i18n.language as I18nResourceCode) ? i18n.language : 'en'}
+                        onChange={({ target: { value: language } }) => i18n.changeLanguage(language)}
+                    >
+                        {i18nResources.map((language) => (
+                            <MenuItem key={language} value={language}>
+                                {langCodeToName(language)}
+                            </MenuItem>
+                        ))}
+                    </Select>
+                </ListItem>
+                <NumberSetting
+                    settingTitle={t('settings.label.manga_item_width')}
+                    settingValue={`px: ${itemWidth}`}
+                    value={itemWidth}
+                    defaultValue={DEFAULT_ITEM_WIDTH}
+                    minValue={100}
+                    maxValue={1000}
+                    stepSize={10}
+                    valueUnit="px"
+                    showSlider
+                    handleUpdate={setItemWidth}
+                />
+            </List>
+        </List>
+    );
+};
diff --git a/src/screens/settings/appearance/theme/CreateThemeButton.tsx b/src/screens/settings/appearance/theme/CreateThemeButton.tsx
new file mode 100644
index 00000000..9ce4a053
--- /dev/null
+++ b/src/screens/settings/appearance/theme/CreateThemeButton.tsx
@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) Contributors to the Suwayomi project
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
+import { useTranslation } from 'react-i18next';
+import Typography from '@mui/material/Typography';
+import Stack from '@mui/material/Stack';
+import Button from '@mui/material/Button';
+import AddCircleIcon from '@mui/icons-material/AddCircle';
+import { bindDialog, bindTrigger, usePopupState } from 'material-ui-popup-state/hooks';
+import { ThemeCreationDialog } from '@/screens/settings/appearance/theme/CreateThemeDialog.tsx';
+
+export const CreateThemeButton = () => {
+    const { t } = useTranslation();
+
+    const popupState = usePopupState({ variant: 'popover', popupId: 'theme-creation-dialog' });
+
+    return (
+        <>
+            <Stack sx={{ alignItems: 'center', gap: 1 }}>
+                <Button
+                    sx={{ minWidth: '150px', height: '225px', m: 1, mb: 0 }}
+                    variant="contained"
+                    size="large"
+                    {...bindTrigger(popupState)}
+                >
+                    <AddCircleIcon />
+                </Button>
+                <Typography>{t('settings.appearance.theme.create.title')}</Typography>
+            </Stack>
+            {popupState.isOpen && <ThemeCreationDialog bindDialogProps={bindDialog(popupState)} mode="create" />}
+        </>
+    );
+};
diff --git a/src/screens/settings/appearance/theme/CreateThemeDialog.tsx b/src/screens/settings/appearance/theme/CreateThemeDialog.tsx
new file mode 100644
index 00000000..7c06bc53
--- /dev/null
+++ b/src/screens/settings/appearance/theme/CreateThemeDialog.tsx
@@ -0,0 +1,220 @@
+/*
+ * Copyright (C) Contributors to the Suwayomi project
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
+import { Trans, useTranslation } from 'react-i18next';
+import { useState } from 'react';
+import Typography from '@mui/material/Typography';
+import Stack from '@mui/material/Stack';
+import Button from '@mui/material/Button';
+import { bindDialog } from 'material-ui-popup-state/hooks';
+import Dialog from '@mui/material/Dialog';
+import DialogTitle from '@mui/material/DialogTitle';
+import DialogContent from '@mui/material/DialogContent';
+import DialogActions from '@mui/material/DialogActions';
+import TextField from '@mui/material/TextField';
+import Link from '@mui/material/Link';
+import { jsonrepair } from 'jsonrepair';
+import { jsonSaveParse } from '@/util/HelperFunctions.ts';
+import { AppTheme, isThemeNameUnique } from '@/lib/ui/AppThemes.ts';
+import {
+    createUpdateMetadataServerSettings,
+    useMetadataServerSettings,
+} from '@/lib/metadata/metadataServerSettings.ts';
+import { MetadataThemeSettings, TranslationKey } from '@/typings.ts';
+import { makeToast } from '@/components/util/Toast.tsx';
+import { EmptyView } from '@/components/util/EmptyView.tsx';
+import { LoadingPlaceholder } from '@/components/util/LoadingPlaceholder.tsx';
+import { defaultPromiseErrorHandler } from '@/util/defaultPromiseErrorHandler.ts';
+
+const baseCustomTheme: AppTheme = {
+    id: '',
+    isCustom: true,
+    getName: () => '',
+    muiTheme: {
+        palette: {
+            primary: {
+                main: '#1976d2',
+            },
+            secondary: {
+                main: '#9c27b0',
+            },
+        },
+    },
+};
+
+type DialogMode = 'create' | 'edit';
+
+const dialogModeToTranslationKey: Record<
+    DialogMode,
+    {
+        title: TranslationKey;
+        button: TranslationKey;
+        action: TranslationKey;
+        success: TranslationKey;
+        failure: TranslationKey;
+    }
+> = {
+    create: {
+        title: 'settings.appearance.theme.create.title',
+        button: 'global.button.ok',
+        action: 'settings.appearance.theme.create.action',
+        success: 'settings.appearance.theme.create.success',
+        failure: 'settings.appearance.theme.create.failure',
+    },
+    edit: {
+        title: 'settings.appearance.theme.edit.title',
+        button: 'global.button.save',
+        action: 'settings.appearance.theme.edit.action',
+        success: 'settings.appearance.theme.edit.success',
+        failure: 'settings.appearance.theme.edit.failure',
+    },
+};
+
+export const ThemeCreationDialog = ({
+    bindDialogProps,
+    mode,
+    appTheme = baseCustomTheme,
+}: {
+    bindDialogProps: ReturnType<typeof bindDialog>;
+    mode: DialogMode;
+    appTheme?: AppTheme;
+}) => {
+    const { t } = useTranslation();
+
+    const {
+        settings: { customThemes },
+        request: { loading, error, refetch },
+    } = useMetadataServerSettings();
+
+    const updateCustomThemes = createUpdateMetadataServerSettings<keyof MetadataThemeSettings>((e) => {
+        throw e;
+    });
+
+    const [theme, setTheme] = useState<AppTheme>(appTheme);
+    const [invalidName, setInvalidName] = useState(false);
+    const [invalidTheme, setInvalidTheme] = useState(false);
+    const [isCreating, setIsCreating] = useState(false);
+    const [didThemeChange, setDidThemeChange] = useState(mode === 'create');
+
+    return (
+        <Dialog {...bindDialogProps} fullWidth maxWidth="md">
+            <DialogTitle>{t(dialogModeToTranslationKey[mode].title)}</DialogTitle>
+            <DialogContent>
+                {loading && <LoadingPlaceholder />}
+                {error && (
+                    <EmptyView
+                        message={t('global.error.label.failed_to_load_data')}
+                        messageExtra={error.message}
+                        retry={() => refetch().catch(defaultPromiseErrorHandler('ThemeCreationDialog::refetch'))}
+                    />
+                )}
+                {!error && (
+                    <Stack sx={{ gap: 2 }}>
+                        <Typography>
+                            <Trans i18nKey="settings.appearance.theme.create.dialog.info.creating_theme">
+                                Create a custom theme with the{' '}
+                                <Link
+                                    href="https://zenoo.github.io/mui-theme-creator/"
+                                    target="_blank"
+                                    rel="noreferrer"
+                                >
+                                    MUI Theme Creator
+                                </Link>{' '}
+                                , copy everything after &quot;themeOptions&quot; from &quot;{'{'}&quot; to &quot;{'}'}
+                                &quot; and paste it into the &quot;theme&quot; text field.
+                            </Trans>
+                        </Typography>
+                        <Typography>{t('settings.appearance.theme.create.dialog.info.theme_mode_lock')}</Typography>
+                        <TextField
+                            disabled={mode === 'edit'}
+                            label={t('settings.appearance.theme.create.dialog.theme_name')}
+                            value={theme.getName()}
+                            error={invalidName}
+                            helperText={invalidName && t('settings.appearance.theme.create.dialog.error.invalid_name')}
+                            onChange={(e) => {
+                                const name = e.target.value.trim();
+
+                                const isValidLength = name.length <= 16;
+                                const isUnique = isThemeNameUnique(name, customThemes);
+                                setInvalidName(!isValidLength || !isUnique);
+
+                                setTheme({
+                                    ...theme,
+                                    id: e.target.value,
+                                    getName: () => e.target.value,
+                                });
+                            }}
+                        />
+                        <TextField
+                            label={t('settings.appearance.theme.title')}
+                            multiline
+                            error={invalidTheme}
+                            helperText={invalidTheme && t('settings.appearance.theme.create.dialog.error.invalid_json')}
+                            defaultValue={JSON.stringify(theme.muiTheme, null, 2)}
+                            onChange={(e) => {
+                                const invalidThemeStr = 'invalid';
+                                const newMuiTheme = (() => {
+                                    try {
+                                        return jsonrepair(e.target.value);
+                                    } catch (_) {
+                                        return invalidThemeStr;
+                                    }
+                                })();
+
+                                const newMuiThemeParsed = jsonSaveParse(newMuiTheme);
+                                const isInvalid = newMuiTheme === invalidThemeStr || !newMuiThemeParsed;
+                                const isThemeDifferentFromOriginal =
+                                    JSON.stringify(newMuiThemeParsed) !== JSON.stringify(appTheme.muiTheme);
+
+                                setDidThemeChange(mode === 'create' ? true : isThemeDifferentFromOriginal);
+                                setInvalidTheme(isInvalid);
+
+                                const didPaletteChange =
+                                    !isInvalid && JSON.stringify(newMuiThemeParsed) !== JSON.stringify(theme.muiTheme);
+                                if (didPaletteChange) {
+                                    setTheme({ ...theme, muiTheme: newMuiThemeParsed });
+                                }
+                            }}
+                        />
+                    </Stack>
+                )}
+            </DialogContent>
+            <DialogActions>
+                <Button autoFocus onClick={bindDialogProps.onClose} color="primary">
+                    {t('global.button.cancel')}
+                </Button>
+                <Button
+                    disabled={invalidTheme || invalidName || isCreating || !didThemeChange}
+                    onClick={(e) => {
+                        makeToast(t(dialogModeToTranslationKey[mode].action, { theme: theme.getName() }), 'info');
+
+                        setIsCreating(true);
+                        updateCustomThemes('customThemes', { ...customThemes, [theme.id]: theme })
+                            .then(() => {
+                                makeToast(
+                                    t(dialogModeToTranslationKey[mode].success, { theme: theme.getName() }),
+                                    'success',
+                                );
+                                bindDialogProps.onClose(e);
+                            })
+                            .catch(() =>
+                                makeToast(
+                                    t(dialogModeToTranslationKey[mode].failure, { theme: theme.getName() }),
+                                    'error',
+                                ),
+                            )
+                            .finally(() => setIsCreating(false));
+                    }}
+                    color="primary"
+                >
+                    {t(dialogModeToTranslationKey[mode].button)}
+                </Button>
+            </DialogActions>
+        </Dialog>
+    );
+};
diff --git a/src/screens/settings/appearance/theme/ThemeList.tsx b/src/screens/settings/appearance/theme/ThemeList.tsx
new file mode 100644
index 00000000..ae70cd1e
--- /dev/null
+++ b/src/screens/settings/appearance/theme/ThemeList.tsx
@@ -0,0 +1,92 @@
+/*
+ * Copyright (C) Contributors to the Suwayomi project
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
+import { useTranslation } from 'react-i18next';
+import Stack from '@mui/material/Stack';
+import { useMemo } from 'react';
+import { appThemes } from '@/lib/ui/AppThemes.ts';
+import {
+    createUpdateMetadataServerSettings,
+    useMetadataServerSettings,
+} from '@/lib/metadata/metadataServerSettings.ts';
+import { MetadataThemeSettings } from '@/typings.ts';
+import { makeToast } from '@/components/util/Toast.tsx';
+import { EmptyView } from '@/components/util/EmptyView.tsx';
+import { LoadingPlaceholder } from '@/components/util/LoadingPlaceholder.tsx';
+import { defaultPromiseErrorHandler } from '@/util/defaultPromiseErrorHandler.ts';
+import { CreateThemeButton } from '@/screens/settings/appearance/theme/CreateThemeButton.tsx';
+import { ThemePreview } from '@/screens/settings/appearance/theme/ThemePreview.tsx';
+
+export const ThemeList = () => {
+    const { t } = useTranslation();
+
+    const {
+        settings: { customThemes },
+        request: { loading, error, refetch },
+    } = useMetadataServerSettings();
+
+    const allThemes = useMemo(
+        () => [
+            ...appThemes,
+            ...Object.values(customThemes).map((customTheme) => ({
+                ...customTheme,
+                getName: () => customTheme.id,
+            })),
+        ],
+        [customThemes],
+    );
+
+    const updateCustomThemes = createUpdateMetadataServerSettings<keyof MetadataThemeSettings>((e) => {
+        throw e;
+    });
+
+    if (loading) {
+        return <LoadingPlaceholder />;
+    }
+
+    if (error) {
+        return (
+            <EmptyView
+                message={t('global.error.label.failed_to_load_data')}
+                messageExtra={error.message}
+                retry={() => refetch().catch(defaultPromiseErrorHandler('ThemeList::refetch'))}
+            />
+        );
+    }
+
+    return (
+        <Stack sx={{ flexDirection: 'row', flexWrap: 'no-wrap', overflowX: 'auto', gap: 1, mx: 1 }}>
+            <CreateThemeButton />
+            {allThemes.map((theme) => (
+                <ThemePreview
+                    key={theme.id}
+                    theme={theme}
+                    onDelete={() => {
+                        makeToast(t('settings.appearance.theme.delete.action', { theme: theme.getName() }), 'info');
+                        updateCustomThemes(
+                            'customThemes',
+                            Object.fromEntries(Object.entries(customThemes).filter(([id]) => id !== theme.id)),
+                        )
+                            .then(() =>
+                                makeToast(
+                                    t('settings.appearance.theme.delete.success', { theme: theme.getName() }),
+                                    'success',
+                                ),
+                            )
+                            .catch(() =>
+                                makeToast(
+                                    t('settings.appearance.theme.delete.failure', { theme: theme.getName() }),
+                                    'error',
+                                ),
+                            );
+                    }}
+                />
+            ))}
+        </Stack>
+    );
+};
diff --git a/src/screens/settings/appearance/theme/ThemePreview.tsx b/src/screens/settings/appearance/theme/ThemePreview.tsx
new file mode 100644
index 00000000..4f99e175
--- /dev/null
+++ b/src/screens/settings/appearance/theme/ThemePreview.tsx
@@ -0,0 +1,185 @@
+/*
+ * Copyright (C) Contributors to the Suwayomi project
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
+import { useTranslation } from 'react-i18next';
+import { useContext, useMemo } from 'react';
+import Box from '@mui/material/Box';
+import Typography from '@mui/material/Typography';
+import Stack from '@mui/material/Stack';
+import { styled, ThemeProvider } from '@mui/material/styles';
+import CheckCircleIcon from '@mui/icons-material/CheckCircle';
+import Card from '@mui/material/Card';
+import CardActionArea from '@mui/material/CardActionArea';
+import DeleteIcon from '@mui/icons-material/Delete';
+import IconButton from '@mui/material/IconButton';
+import Tooltip from '@mui/material/Tooltip';
+import EditIcon from '@mui/icons-material/Edit';
+import { bindDialog, usePopupState } from 'material-ui-popup-state/hooks';
+import { ThemeModeContext } from '@/components/context/ThemeModeContext.tsx';
+import { AppTheme } from '@/lib/ui/AppThemes.ts';
+import { createTheme } from '@/theme.ts';
+import { ThemeCreationDialog } from '@/screens/settings/appearance/theme/CreateThemeDialog.tsx';
+
+const ThemePreviewBadge = styled(Box)(({ theme }) => ({
+    width: '15px',
+    height: '20px',
+    borderRadius: theme.shape.borderRadius,
+}));
+
+export const ThemePreview = ({ theme, onDelete }: { theme: AppTheme; onDelete: () => void }) => {
+    const { getName } = theme;
+
+    const { t } = useTranslation();
+    const { themeMode, setAppTheme, appTheme, pureBlackMode } = useContext(ThemeModeContext);
+
+    const popupState = usePopupState({ variant: 'popover', popupId: `theme-edit-dialog-${theme.id}` });
+
+    const isSelected = theme.id === appTheme;
+
+    const muiTheme = useMemo(() => createTheme(themeMode, theme, pureBlackMode), [theme, themeMode, pureBlackMode]);
+
+    return (
+        <>
+            <Stack
+                sx={{
+                    m: 1,
+                    justifyContent: 'center',
+                    alignItems: 'center',
+                    minWidth: '150px',
+                    maxWidth: '150px',
+                    gap: 1,
+                    position: 'relative',
+                }}
+            >
+                <ThemeProvider theme={muiTheme}>
+                    <Card
+                        sx={{
+                            width: '100%',
+                            height: '225px',
+                            outline: '4px solid',
+                            outlineColor: isSelected
+                                ? muiTheme.palette.primary.light
+                                : muiTheme.palette.background.paper,
+                            borderRadius: 1,
+                            p: 0,
+                        }}
+                    >
+                        <CardActionArea
+                            sx={{ height: '100%', backgroundColor: 'background.default' }}
+                            onClick={() => setAppTheme(theme.id)}
+                        >
+                            <Stack sx={{ height: '100%' }}>
+                                <Stack sx={{ height: '100%', gap: 2, p: 1 }}>
+                                    <Stack
+                                        sx={{
+                                            maxHeight: '20px',
+                                            flexDirection: 'row',
+                                            justifyContent: 'space-between',
+                                            alignItems: 'center',
+                                        }}
+                                    >
+                                        <Box
+                                            sx={{
+                                                width: '65%',
+                                                height: '20px',
+                                                backgroundColor: 'primary.dark',
+                                                borderRadius: 1,
+                                            }}
+                                        />
+                                        <Stack sx={{ height: '100%', alignItems: 'center', gap: 1 }}>
+                                            {isSelected && (
+                                                <CheckCircleIcon
+                                                    sx={{
+                                                        visibility: isSelected ? 'visible' : 'hidden',
+                                                        color: 'primary.light',
+                                                    }}
+                                                />
+                                            )}
+                                            {!isSelected && theme.isCustom && (
+                                                <IconButton
+                                                    onClick={(e) => {
+                                                        e.preventDefault();
+                                                        e.stopPropagation();
+                                                        onDelete();
+                                                    }}
+                                                    component="div"
+                                                    size="small"
+                                                >
+                                                    <Tooltip title={t('global.button.delete')}>
+                                                        <DeleteIcon />
+                                                    </Tooltip>
+                                                </IconButton>
+                                            )}
+                                            {theme.isCustom && (
+                                                <IconButton
+                                                    onClick={(e) => {
+                                                        e.preventDefault();
+                                                        e.stopPropagation();
+                                                        popupState.open();
+                                                    }}
+                                                    component="div"
+                                                    size="small"
+                                                >
+                                                    <Tooltip title={t('global.button.edit')}>
+                                                        <EditIcon />
+                                                    </Tooltip>
+                                                </IconButton>
+                                            )}
+                                        </Stack>
+                                    </Stack>
+                                    <Stack
+                                        sx={{
+                                            flexDirection: 'row',
+                                            width: '55%',
+                                            height: '65%',
+                                            backgroundColor: 'background.paper',
+                                            borderRadius: 1,
+                                            p: 1,
+                                        }}
+                                    >
+                                        <ThemePreviewBadge sx={{ backgroundColor: 'primary.main' }} />
+                                        <ThemePreviewBadge sx={{ backgroundColor: 'secondary.main' }} />
+                                    </Stack>
+                                </Stack>
+                                <Stack
+                                    sx={{
+                                        height: '80px',
+                                        backgroundColor: muiTheme.palette.background.paper,
+                                        justifyContent: 'center',
+                                        alignItems: 'center',
+                                        flexDirection: 'row',
+                                        gap: 1,
+                                    }}
+                                >
+                                    <Box
+                                        sx={{
+                                            width: '20px',
+                                            height: '20px',
+                                            borderRadius: '50%',
+                                            backgroundColor: 'primary.main',
+                                        }}
+                                    />
+                                    <Box
+                                        sx={{
+                                            flexGrow: 0.75,
+                                            height: '20px',
+                                            borderRadius: 1,
+                                            backgroundColor: 'primary.light',
+                                        }}
+                                    />
+                                </Stack>
+                            </Stack>
+                        </CardActionArea>
+                    </Card>
+                </ThemeProvider>
+                <Typography>{getName()}</Typography>
+            </Stack>
+            <ThemeCreationDialog bindDialogProps={bindDialog(popupState)} mode="edit" appTheme={theme} />
+        </>
+    );
+};
diff --git a/src/theme.ts b/src/theme.ts
index 95616d4f..f67e19aa 100644
--- a/src/theme.ts
+++ b/src/theme.ts
@@ -17,28 +17,32 @@ import {
 } from '@mui/material/styles';
 import { ThemeMode } from '@/components/context/ThemeModeContext.tsx';
 import { MediaQuery } from '@/lib/ui/MediaQuery.tsx';
-import { AppThemes, getTheme } from '@/lib/ui/AppThemes.ts';
+import { AppTheme } from '@/lib/ui/AppThemes.ts';
 
 export const SCROLLBAR_WIDTH = 14;
 
 export const createTheme = (
     themeMode: ThemeMode,
-    appThemeId: AppThemes,
+    appTheme: AppTheme,
     pureBlackMode: boolean = false,
     direction: Direction = 'ltr',
 ) => {
-    const appTheme = getTheme(appThemeId);
-
     const systemMode = MediaQuery.getSystemThemeMode();
-    const mode = themeMode === ThemeMode.SYSTEM ? systemMode : themeMode;
+
+    const isStaticThemeMode = !!appTheme.muiTheme.palette?.mode;
+    const appThemeMode = appTheme.muiTheme.palette?.mode === 'dark' ? ThemeMode.DARK : ThemeMode.LIGHT;
+    const staticThemeMode = isStaticThemeMode ? appThemeMode : undefined;
+
+    const mode = staticThemeMode ?? (themeMode === ThemeMode.SYSTEM ? systemMode : themeMode);
     const isDarkMode = mode === ThemeMode.DARK;
     const setPureBlackMode = isDarkMode && pureBlackMode;
 
     const baseTheme = createMuiTheme({
         direction,
+        ...appTheme.muiTheme,
         palette: {
             mode,
-            ...appTheme.palette,
+            ...(appTheme.muiTheme.palette ?? {}),
         },
     });
 
@@ -55,7 +59,11 @@ export const createTheme = (
         default: lighten(baseTheme.palette.primary.dark, 0.85),
     };
     const backgroundThemeMode = isDarkMode ? backgroundDark : backgroundLight;
-    const background = setPureBlackMode ? backgroundTrueBlack : backgroundThemeMode;
+    const automaticBackground = setPureBlackMode ? backgroundTrueBlack : backgroundThemeMode;
+    const appThemeBackground = appTheme.muiTheme.palette?.background;
+
+    const requiresAutomaticBackground = setPureBlackMode || !appThemeBackground;
+    const background = requiresAutomaticBackground ? automaticBackground : appThemeBackground;
 
     const colorTheme = createMuiTheme(baseTheme, {
         palette: {
diff --git a/src/typings.ts b/src/typings.ts
index 8298a673..e8cfa5a5 100644
--- a/src/typings.ts
+++ b/src/typings.ts
@@ -20,6 +20,7 @@ import {
     SourcePreferenceChangeInput,
     TrackerType,
 } from '@/lib/graphql/generated/graphql.ts';
+import { AppTheme } from '@/lib/ui/AppThemes.ts';
 
 type GenericLocation<State = any> = Omit<Location, 'state'> & { state?: State };
 
@@ -156,13 +157,18 @@ export type MetadataUpdateSettings = {
     serverInformAvailableUpdate: boolean;
 };
 
+export type MetadataThemeSettings = {
+    customThemes: Record<string, AppTheme>;
+};
+
 export type MetadataServerSettings = MetadataDownloadSettings &
     MetadataLibrarySettings &
     MetadataClientSettings &
     MetadataMigrationSettings &
     MetadataBrowseSettings &
     MetadataTrackingSettings &
-    MetadataUpdateSettings;
+    MetadataUpdateSettings &
+    MetadataThemeSettings;
 
 export interface ISearchSettings {
     ignoreFilters: boolean;
diff --git a/yarn.lock b/yarn.lock
index 4c31e7d4..9075beac 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -5862,6 +5862,11 @@ jsonify@^0.0.1:
   resolved "https://registry.yarnpkg.com/jsonify/-/jsonify-0.0.1.tgz#2aa3111dae3d34a0f151c63f3a45d995d9420978"
   integrity sha512-2/Ki0GcmuqSrgFyelQq9M05y7PS0mEwuIzrf3f1fPqkVDVRvZrPZtVSMHxdgo8Aq0sxAOb/cr2aqqA3LeWHVPg==
 
+jsonrepair@3.8.0:
+  version "3.8.0"
+  resolved "https://registry.yarnpkg.com/jsonrepair/-/jsonrepair-3.8.0.tgz#33a1b0d3630c452e9945ef07d760469cdfad8823"
+  integrity sha512-89lrxpwp+IEcJ6kwglF0HH3Tl17J08JEpYfXnvvjdp4zV4rjSoGu2NdQHxBs7yTOk3ETjTn9du48pBy8iBqj1w==
+
 "jsx-ast-utils@^2.4.1 || ^3.0.0", jsx-ast-utils@^3.3.5:
   version "3.3.5"
   resolved "https://registry.yarnpkg.com/jsx-ast-utils/-/jsx-ast-utils-3.3.5.tgz#4766bd05a8e2a11af222becd19e15575e52a853a"