diff --git a/native/types/themes.js b/lib/types/theme-types.js
copy from native/types/themes.js
copy to lib/types/theme-types.js
--- a/native/types/themes.js
+++ b/lib/types/theme-types.js
@@ -1,7 +1,5 @@
 // @flow
 
-import { Platform } from 'react-native';
-
 export type GlobalTheme = 'light' | 'dark';
 export type GlobalThemePreference = GlobalTheme | 'system';
 
@@ -11,10 +9,6 @@
   +preference: GlobalThemePreference,
 };
 
-export const osCanTheme: boolean =
-  (Platform.OS === 'ios' && parseInt(Platform.Version, 10) >= 13) ||
-  (Platform.OS === 'android' && Platform.Version >= 29);
-
 export const defaultGlobalThemeInfo = {
   // revert to `activeTheme: osCanTheme ? null : 'light'` to re-enable theming
   activeTheme: 'dark',
diff --git a/native/chat/settings/delete-thread.react.js b/native/chat/settings/delete-thread.react.js
--- a/native/chat/settings/delete-thread.react.js
+++ b/native/chat/settings/delete-thread.react.js
@@ -45,7 +45,6 @@
 import type { NavigationRoute } from '../../navigation/route-names.js';
 import { useSelector } from '../../redux/redux-utils.js';
 import { type Colors, useColors, useStyles } from '../../themes/colors.js';
-import type { GlobalTheme } from '../../types/themes.js';
 import Alert from '../../utils/alert.js';
 import type { ChatNavigationProp } from '../chat.react.js';
 
@@ -63,7 +62,6 @@
   +threadInfo: ResolvedThreadInfo,
   +shouldUseDeleteConfirmationAlert: boolean,
   +loadingStatus: LoadingStatus,
-  +activeTheme: ?GlobalTheme,
   +colors: Colors,
   +styles: typeof unboundStyles,
   // Redux dispatch functions
@@ -269,7 +267,6 @@
     const resolvedThreadInfo = useResolvedThreadInfo(threadInfo);
 
     const loadingStatus = useSelector(loadingStatusSelector);
-    const activeTheme = useSelector(state => state.globalThemeInfo.activeTheme);
 
     const colors = useColors();
     const styles = useStyles(unboundStyles);
@@ -290,7 +287,6 @@
         threadInfo={resolvedThreadInfo}
         shouldUseDeleteConfirmationAlert={shouldUseDeleteConfirmationAlert}
         loadingStatus={loadingStatus}
-        activeTheme={activeTheme}
         colors={colors}
         styles={styles}
         dispatchActionPromise={dispatchActionPromise}
diff --git a/native/markdown/styles.js b/native/markdown/styles.js
--- a/native/markdown/styles.js
+++ b/native/markdown/styles.js
@@ -3,8 +3,9 @@
 import _memoize from 'lodash/memoize.js';
 import { Platform } from 'react-native';
 
+import { type GlobalTheme } from 'lib/types/theme-types.js';
+
 import { getStylesForTheme } from '../themes/colors.js';
-import type { GlobalTheme } from '../types/themes.js';
 
 const unboundStyles = {
   link: {
diff --git a/native/navigation/nav-selectors.js b/native/navigation/nav-selectors.js
--- a/native/navigation/nav-selectors.js
+++ b/native/navigation/nav-selectors.js
@@ -15,6 +15,7 @@
   ComposableMessageInfo,
   RobotextMessageInfo,
 } from 'lib/types/message-types.js';
+import type { GlobalTheme } from 'lib/types/theme-types.js';
 import type { ThreadInfo } from 'lib/types/thread-types.js';
 
 import type { NavContextType } from './navigation-context.js';
@@ -43,7 +44,6 @@
 import type { RemoveEditMode } from '../chat/message-list-types';
 import { useSelector } from '../redux/redux-utils.js';
 import type { NavPlusRedux } from '../types/selector-types.js';
-import type { GlobalTheme } from '../types/themes.js';
 
 const baseCreateIsForegroundSelector = (routeName: string) =>
   createSelector(
diff --git a/native/profile/appearance-preferences.react.js b/native/profile/appearance-preferences.react.js
--- a/native/profile/appearance-preferences.react.js
+++ b/native/profile/appearance-preferences.react.js
@@ -6,17 +6,17 @@
 import { useDispatch } from 'react-redux';
 
 import type { Dispatch } from 'lib/types/redux-types.js';
+import type {
+  GlobalThemeInfo,
+  GlobalThemePreference,
+} from 'lib/types/theme-types.js';
 
 import Button from '../components/button.react.js';
 import SWMansionIcon from '../components/swmansion-icon.react.js';
 import { updateThemeInfoActionType } from '../redux/action-types.js';
 import { useSelector } from '../redux/redux-utils.js';
 import { type Colors, useColors, useStyles } from '../themes/colors.js';
-import {
-  type GlobalThemePreference,
-  type GlobalThemeInfo,
-  osCanTheme,
-} from '../types/themes.js';
+import { osCanTheme } from '../types/themes.js';
 
 const CheckIcon = () => (
   <SWMansionIcon
diff --git a/native/profile/edit-password.react.js b/native/profile/edit-password.react.js
--- a/native/profile/edit-password.react.js
+++ b/native/profile/edit-password.react.js
@@ -31,7 +31,6 @@
 import type { NavigationRoute } from '../navigation/route-names.js';
 import { useSelector } from '../redux/redux-utils.js';
 import { type Colors, useColors, useStyles } from '../themes/colors.js';
-import type { GlobalTheme } from '../types/themes.js';
 import Alert from '../utils/alert.js';
 
 type BaseProps = {
@@ -43,7 +42,6 @@
   // Redux state
   +loadingStatus: LoadingStatus,
   +username: ?string,
-  +activeTheme: ?GlobalTheme,
   +colors: Colors,
   +styles: typeof unboundStyles,
   // Redux dispatch functions
@@ -351,7 +349,6 @@
       }
       return undefined;
     });
-    const activeTheme = useSelector(state => state.globalThemeInfo.activeTheme);
     const colors = useColors();
     const styles = useStyles(unboundStyles);
 
@@ -363,7 +360,6 @@
         {...props}
         loadingStatus={loadingStatus}
         username={username}
-        activeTheme={activeTheme}
         colors={colors}
         styles={styles}
         dispatchActionPromise={dispatchActionPromise}
diff --git a/native/push/in-app-notif.react.js b/native/push/in-app-notif.react.js
--- a/native/push/in-app-notif.react.js
+++ b/native/push/in-app-notif.react.js
@@ -4,8 +4,9 @@
 import { View, StyleSheet, Platform } from 'react-native';
 import { SafeAreaView } from 'react-native-safe-area-context';
 
+import type { GlobalTheme } from 'lib/types/theme-types.js';
+
 import SingleLine from '../components/single-line.react.js';
-import type { GlobalTheme } from '../types/themes.js';
 
 const edges = ['top'];
 
diff --git a/native/push/push-handler.react.js b/native/push/push-handler.react.js
--- a/native/push/push-handler.react.js
+++ b/native/push/push-handler.react.js
@@ -25,6 +25,7 @@
 import type { RawMessageInfo } from 'lib/types/message-types.js';
 import type { Dispatch } from 'lib/types/redux-types.js';
 import { type ConnectionInfo } from 'lib/types/socket-types.js';
+import type { GlobalTheme } from 'lib/types/theme-types.js';
 import { type ThreadInfo } from 'lib/types/thread-types.js';
 import {
   useServerCall,
@@ -78,7 +79,6 @@
 import { useSelector } from '../redux/redux-utils.js';
 import { RootContext, type RootContextType } from '../root-context.js';
 import type { EventSubscription } from '../types/react-native.js';
-import { type GlobalTheme } from '../types/themes.js';
 import Alert from '../utils/alert.js';
 
 LogBox.ignoreLogs([
diff --git a/native/redux/action-types.js b/native/redux/action-types.js
--- a/native/redux/action-types.js
+++ b/native/redux/action-types.js
@@ -5,13 +5,13 @@
 import { saveMessagesActionType } from 'lib/actions/message-actions.js';
 import type { Shape } from 'lib/types/core.js';
 import type { BaseAction } from 'lib/types/redux-types.js';
+import type { GlobalThemeInfo } from 'lib/types/theme-types.js';
 
 import type { DimensionsInfo } from './dimensions-updater.react.js';
 import type { AppState } from './state-types.js';
 import type { DeviceCameraInfo } from '../types/camera.js';
 import type { ConnectivityInfo } from '../types/connectivity.js';
 import type { LocalSettings } from '../types/local-settings-types.js';
-import type { GlobalThemeInfo } from '../types/themes.js';
 
 export const updateDimensionsActiveType = 'UPDATE_DIMENSIONS';
 export const updateConnectivityActiveType = 'UPDATE_CONNECTIVITY';
diff --git a/native/redux/default-state.js b/native/redux/default-state.js
--- a/native/redux/default-state.js
+++ b/native/redux/default-state.js
@@ -7,6 +7,7 @@
 import { defaultCalendarQuery } from 'lib/types/entry-types.js';
 import { defaultCalendarFilters } from 'lib/types/filter-types.js';
 import { defaultConnectionInfo } from 'lib/types/socket-types.js';
+import { defaultGlobalThemeInfo } from 'lib/types/theme-types.js';
 import { defaultNotifPermissionAlertInfo } from 'lib/utils/push-alerts.js';
 import { ashoatKeyserverID } from 'lib/utils/validation-utils.js';
 
@@ -15,7 +16,6 @@
 import { defaultNavInfo } from '../navigation/default-state.js';
 import { defaultDeviceCameraInfo } from '../types/camera.js';
 import { defaultConnectivityInfo } from '../types/connectivity.js';
-import { defaultGlobalThemeInfo } from '../types/themes.js';
 import { defaultURLPrefix, natNodeServer } from '../utils/url-utils.js';
 
 const defaultState = ({
diff --git a/native/redux/persist.js b/native/redux/persist.js
--- a/native/redux/persist.js
+++ b/native/redux/persist.js
@@ -59,6 +59,7 @@
   defaultConnectionInfo,
   type ConnectionInfo,
 } from 'lib/types/socket-types.js';
+import { defaultGlobalThemeInfo } from 'lib/types/theme-types.js';
 import type { ClientDBThreadInfo } from 'lib/types/thread-types.js';
 import {
   translateClientDBMessageInfoToRawMessageInfo,
@@ -91,7 +92,6 @@
 import { updateRolesAndPermissions } from './update-roles-and-permissions.js';
 import { commCoreModule } from '../native-modules.js';
 import { defaultDeviceCameraInfo } from '../types/camera.js';
-import { defaultGlobalThemeInfo } from '../types/themes.js';
 import { isTaskCancelledError } from '../utils/error-handling.js';
 
 const migrations = {
diff --git a/native/redux/state-types.js b/native/redux/state-types.js
--- a/native/redux/state-types.js
+++ b/native/redux/state-types.js
@@ -15,6 +15,7 @@
 import type { MessageStore } from 'lib/types/message-types.js';
 import type { UserPolicies } from 'lib/types/policy-types.js';
 import type { ReportStore } from 'lib/types/report-types.js';
+import type { GlobalThemeInfo } from 'lib/types/theme-types.js';
 import type { ThreadActivityStore } from 'lib/types/thread-activity-types';
 import type { ThreadStore } from 'lib/types/thread-types.js';
 import type { CurrentUserInfo, UserStore } from 'lib/types/user-types.js';
@@ -25,7 +26,6 @@
 import type { DeviceCameraInfo } from '../types/camera.js';
 import type { ConnectivityInfo } from '../types/connectivity.js';
 import type { LocalSettings } from '../types/local-settings-types.js';
-import type { GlobalThemeInfo } from '../types/themes.js';
 
 export type AppState = {
   +navInfo: NavInfo,
diff --git a/native/redux/theme-reducer.js b/native/redux/theme-reducer.js
--- a/native/redux/theme-reducer.js
+++ b/native/redux/theme-reducer.js
@@ -7,13 +7,13 @@
   logInActionTypes,
   registerActionTypes,
 } from 'lib/actions/user-actions.js';
+import {
+  defaultGlobalThemeInfo,
+  type GlobalThemeInfo,
+} from 'lib/types/theme-types.js';
 import { setNewSessionActionType } from 'lib/utils/action-utils.js';
 
 import { updateThemeInfoActionType, type Action } from './action-types.js';
-import {
-  type GlobalThemeInfo,
-  defaultGlobalThemeInfo,
-} from '../types/themes.js';
 
 export default function reduceGlobalThemeInfo(
   state: GlobalThemeInfo,
diff --git a/native/themes/colors.js b/native/themes/colors.js
--- a/native/themes/colors.js
+++ b/native/themes/colors.js
@@ -4,11 +4,12 @@
 import { StyleSheet } from 'react-native';
 import { createSelector } from 'reselect';
 
+import type { GlobalTheme } from 'lib/types/theme-types.js';
+
 import { selectBackgroundIsDark } from '../navigation/nav-selectors.js';
 import { NavContext } from '../navigation/navigation-context.js';
 import { useSelector } from '../redux/redux-utils.js';
 import type { AppState } from '../redux/state-types.js';
-import type { GlobalTheme } from '../types/themes.js';
 
 const designSystemColors = Object.freeze({
   shadesWhite100: '#ffffff',
diff --git a/native/themes/theme-handler.react.js b/native/themes/theme-handler.react.js
--- a/native/themes/theme-handler.react.js
+++ b/native/themes/theme-handler.react.js
@@ -6,14 +6,11 @@
 import { useDispatch } from 'react-redux';
 
 import type { Shape } from 'lib/types/core.js';
+import type { GlobalTheme, GlobalThemeInfo } from 'lib/types/theme-types.js';
 
 import { updateThemeInfoActionType } from '../redux/action-types.js';
 import { useSelector } from '../redux/redux-utils.js';
-import {
-  type GlobalTheme,
-  type GlobalThemeInfo,
-  osCanTheme,
-} from '../types/themes.js';
+import { osCanTheme } from '../types/themes.js';
 
 function ThemeHandler(): null {
   const globalThemeInfo = useSelector(state => state.globalThemeInfo);
diff --git a/native/types/themes.js b/native/types/themes.js
--- a/native/types/themes.js
+++ b/native/types/themes.js
@@ -2,24 +2,6 @@
 
 import { Platform } from 'react-native';
 
-export type GlobalTheme = 'light' | 'dark';
-export type GlobalThemePreference = GlobalTheme | 'system';
-
-export type GlobalThemeInfo = {
-  +activeTheme: ?GlobalTheme,
-  +systemTheme: ?GlobalTheme,
-  +preference: GlobalThemePreference,
-};
-
 export const osCanTheme: boolean =
   (Platform.OS === 'ios' && parseInt(Platform.Version, 10) >= 13) ||
   (Platform.OS === 'android' && Platform.Version >= 29);
-
-export const defaultGlobalThemeInfo = {
-  // revert to `activeTheme: osCanTheme ? null : 'light'` to re-enable theming
-  activeTheme: 'dark',
-  systemTheme: null,
-  // revert to `preference: osCanTheme ? 'system' : 'light'`
-  // to re-enable theming
-  preference: 'dark',
-};
diff --git a/native/utils/alert.js b/native/utils/alert.js
--- a/native/utils/alert.js
+++ b/native/utils/alert.js
@@ -2,8 +2,12 @@
 
 import { Alert } from 'react-native';
 
+import {
+  defaultGlobalThemeInfo,
+  type GlobalTheme,
+} from 'lib/types/theme-types.js';
+
 import { store } from '../redux/redux-setup.js';
-import { type GlobalTheme, defaultGlobalThemeInfo } from '../types/themes.js';
 
 type AlertWrapper = {
   +alert: typeof Alert.alert,