diff --git a/lib/handlers/dm-activity-handler.js b/lib/handlers/dm-activity-handler.js
new file mode 100644
index 000000000..25c06a5e8
--- /dev/null
+++ b/lib/handlers/dm-activity-handler.js
@@ -0,0 +1,107 @@
+// @flow
+import invariant from 'invariant';
+import * as React from 'react';
+
+import { updateActivityActionTypes } from '../actions/activity-actions.js';
+import {
+  type OutboundDMOperationSpecification,
+  dmOperationSpecificationTypes,
+} from '../shared/dm-ops/dm-op-utils.js';
+import { useProcessAndSendDMOperation } from '../shared/dm-ops/process-dm-ops.js';
+import { getMostRecentNonLocalMessageID } from '../shared/message-utils.js';
+import { threadIsPending } from '../shared/thread-utils.js';
+import type { ActivityUpdateSuccessPayload } from '../types/activity-types.js';
+import type { DMChangeThreadReadStatusOperation } from '../types/dm-ops.js';
+import type { RawThreadInfo } from '../types/minimally-encoded-thread-permissions-types.js';
+import { threadTypeIsThick } from '../types/thread-types-enum.js';
+import { useDispatchActionPromise } from '../utils/redux-promise-utils.js';
+import { useSelector } from '../utils/redux-utils.js';
+
+function useUpdateDMActivity(): (
+  viewerID: string,
+  activeThreadInfo: RawThreadInfo,
+) => Promise<ActivityUpdateSuccessPayload> {
+  const processAndSendDMOperation = useProcessAndSendDMOperation();
+  return React.useCallback(
+    async (viewerID: string, activeThreadInfo: RawThreadInfo) => {
+      invariant(
+        threadTypeIsThick(activeThreadInfo.type),
+        'thread must be thick',
+      );
+      const op: DMChangeThreadReadStatusOperation = {
+        type: 'change_thread_read_status',
+        time: Date.now(),
+        threadID: activeThreadInfo.id,
+        creatorID: viewerID,
+        unread: false,
+      };
+
+      const opSpecification: OutboundDMOperationSpecification = {
+        type: dmOperationSpecificationTypes.OUTBOUND,
+        op,
+        recipients: { type: 'self_devices' },
+      };
+
+      await processAndSendDMOperation(opSpecification);
+      return { activityUpdates: {}, result: { unfocusedToUnread: [] } };
+    },
+    [processAndSendDMOperation],
+  );
+}
+
+function useDMActivityHandler(activeThread: ?string): void {
+  const activeThreadInfo = useSelector(state =>
+    activeThread ? state.threadStore.threadInfos[activeThread] : null,
+  );
+  const activeThreadLatestMessage = useSelector(state =>
+    activeThread
+      ? getMostRecentNonLocalMessageID(activeThread, state.messageStore)
+      : null,
+  );
+  const processAndSendDMOperation = useProcessAndSendDMOperation();
+
+  const prevActiveThreadRef = React.useRef<?string>();
+  const prevActiveThreadLatestMessageRef = React.useRef<?string>();
+
+  const viewerID = useSelector(
+    state => state.currentUserInfo && state.currentUserInfo.id,
+  );
+  const updateDMActivity = useUpdateDMActivity();
+  const dispatchActionPromise = useDispatchActionPromise();
+
+  React.useEffect(() => {
+    const prevActiveThread = prevActiveThreadRef.current;
+    const prevActiveThreadLatestMessage =
+      prevActiveThreadLatestMessageRef.current;
+
+    prevActiveThreadRef.current = activeThread;
+    prevActiveThreadLatestMessageRef.current = activeThreadLatestMessage;
+
+    if (
+      !viewerID ||
+      !activeThread ||
+      !activeThreadInfo ||
+      !threadTypeIsThick(activeThreadInfo.type) ||
+      threadIsPending(activeThread) ||
+      (activeThread === prevActiveThread &&
+        activeThreadLatestMessage === prevActiveThreadLatestMessage)
+    ) {
+      return;
+    }
+
+    void dispatchActionPromise(
+      updateActivityActionTypes,
+      updateDMActivity(viewerID, activeThreadInfo),
+    );
+  }, [
+    updateDMActivity,
+    dispatchActionPromise,
+    activeThread,
+    viewerID,
+    processAndSendDMOperation,
+    activeThreadInfo,
+    activeThreadLatestMessage,
+  ]);
+}
+
+export default useDMActivityHandler;
diff --git a/native/components/dm-activity-handler.react.js b/native/components/dm-activity-handler.react.js
new file mode 100644
index 000000000..14e69ae48
--- /dev/null
+++ b/native/components/dm-activity-handler.react.js
@@ -0,0 +1,27 @@
+// @flow
+import * as React from 'react';
+
+import useDMActivityHandler from 'lib/handlers/dm-activity-handler.js';
+import { isLoggedIn } from 'lib/selectors/user-selectors.js';
+
+import { activeMessageListSelector } from '../navigation/nav-selectors.js';
+import { NavContext } from '../navigation/navigation-context.js';
+import { useSelector } from '../redux/redux-utils.js';
+
+function DMActivityHandler(): React.Node {
+  const active = useSelector(
+    state => isLoggedIn(state) && state.lifecycleState !== 'background',
+  );
+  const navContext = React.useContext(NavContext);
+  const activeThread = React.useMemo(() => {
+    if (!active) {
+      return null;
+    }
+    return activeMessageListSelector(navContext);
+  }, [active, navContext]);
+
+  useDMActivityHandler(activeThread);
+  return null;
+}
+
+export default DMActivityHandler;
diff --git a/native/root.react.js b/native/root.react.js
index 7731fbf8c..425c1e5d7 100644
--- a/native/root.react.js
+++ b/native/root.react.js
@@ -1,428 +1,430 @@
 // @flow
 
 import { ActionSheetProvider } from '@expo/react-native-action-sheet';
 import { BottomSheetModalProvider } from '@gorhom/bottom-sheet';
 import AsyncStorage from '@react-native-async-storage/async-storage';
 import type {
   PossiblyStaleNavigationState,
   UnsafeContainerActionEvent,
   GenericNavigationAction,
 } from '@react-navigation/core';
 import { useReduxDevToolsExtension } from '@react-navigation/devtools';
 import { NavigationContainer } from '@react-navigation/native';
 import * as SplashScreen from 'expo-splash-screen';
 import invariant from 'invariant';
 import * as React from 'react';
 import { StyleSheet } from 'react-native';
 import { GestureHandlerRootView } from 'react-native-gesture-handler';
 import Orientation from 'react-native-orientation-locker';
 import {
   SafeAreaProvider,
   initialWindowMetrics,
 } from 'react-native-safe-area-context';
 import { Provider } from 'react-redux';
 import { PersistGate as ReduxPersistGate } from 'redux-persist/es/integration/react.js';
 
 import { ChatMentionContextProvider } from 'lib/components/chat-mention-provider.react.js';
 import { EditUserAvatarProvider } from 'lib/components/edit-user-avatar-provider.react.js';
 import { ENSCacheProvider } from 'lib/components/ens-cache-provider.react.js';
 import { FarcasterDataHandler } from 'lib/components/farcaster-data-handler.react.js';
 import IntegrityHandler from 'lib/components/integrity-handler.react.js';
 import { MediaCacheProvider } from 'lib/components/media-cache-provider.react.js';
 import { NeynarClientProvider } from 'lib/components/neynar-client-provider.react.js';
 import PlatformDetailsSynchronizer from 'lib/components/platform-details-synchronizer.react.js';
 import PrekeysHandler from 'lib/components/prekeys-handler.react.js';
 import { QRAuthProvider } from 'lib/components/qr-auth-provider.react.js';
 import { StaffContextProvider } from 'lib/components/staff-provider.react.js';
 import { UserIdentityCacheProvider } from 'lib/components/user-identity-cache.react.js';
 import { DBOpsHandler } from 'lib/handlers/db-ops-handler.react.js';
 import { TunnelbrokerDeviceTokenHandler } from 'lib/handlers/tunnelbroker-device-token-handler.react.js';
 import { UserInfosHandler } from 'lib/handlers/user-infos-handler.react.js';
 import { IdentitySearchProvider } from 'lib/identity-search/identity-search-context.js';
 import { CallKeyserverEndpointProvider } from 'lib/keyserver-conn/call-keyserver-endpoint-provider.react.js';
 import KeyserverConnectionsHandler from 'lib/keyserver-conn/keyserver-connections-handler.js';
 import { TunnelbrokerProvider } from 'lib/tunnelbroker/tunnelbroker-context.js';
 import { actionLogger } from 'lib/utils/action-logger.js';
 
 import { RegistrationContextProvider } from './account/registration/registration-context-provider.react.js';
 import NativeEditThreadAvatarProvider from './avatars/native-edit-thread-avatar-provider.react.js';
 import BackupHandler from './backup/backup-handler.js';
 import { BottomSheetProvider } from './bottom-sheet/bottom-sheet-provider.react.js';
 import ChatContextProvider from './chat/chat-context-provider.react.js';
 import MessageEditingContextProvider from './chat/message-editing-context-provider.react.js';
 import AccessTokenHandler from './components/access-token-handler.react.js';
 import { AutoJoinCommunityHandler } from './components/auto-join-community-handler.react.js';
 import BackgroundIdentityLoginHandler from './components/background-identity-login-handler.react.js';
 import ConnectFarcasterAlertHandler from './components/connect-farcaster-alert-handler.react.js';
+import DMActivityHandler from './components/dm-activity-handler.react.js';
 import { FeatureFlagsProvider } from './components/feature-flags-provider.react.js';
 import { NUXTipsContextProvider } from './components/nux-tips-context.react.js';
 import PersistedStateGate from './components/persisted-state-gate.js';
 import ReportHandler from './components/report-handler.react.js';
 import VersionSupportedChecker from './components/version-supported.react.js';
 import ConnectedStatusBar from './connected-status-bar.react.js';
 import { SQLiteDataHandler } from './data/sqlite-data-handler.js';
 import ErrorBoundary from './error-boundary.react.js';
 import IdentityServiceContextProvider from './identity-service/identity-service-context-provider.react.js';
 import InputStateContainer from './input/input-state-container.react.js';
 import LifecycleHandler from './lifecycle/lifecycle-handler.react.js';
 import MarkdownContextProvider from './markdown/markdown-context-provider.react.js';
 import { filesystemMediaCache } from './media/media-cache.js';
 import { DeepLinksContextProvider } from './navigation/deep-links-context-provider.react.js';
 import { defaultNavigationState } from './navigation/default-state.js';
 import { setGlobalNavContext } from './navigation/icky-global.js';
 import KeyserverReachabilityHandler from './navigation/keyserver-reachability-handler.js';
 import {
   NavContext,
   type NavContextType,
 } from './navigation/navigation-context.js';
 import NavigationHandler from './navigation/navigation-handler.react.js';
 import { validNavState } from './navigation/navigation-utils.js';
 import OrientationHandler from './navigation/orientation-handler.react.js';
 import { navStateAsyncStorageKey } from './navigation/persistance.js';
 import RootNavigator from './navigation/root-navigator.react.js';
 import {
   composeTunnelbrokerQRAuthMessage,
   handleSecondaryDeviceLogInError,
   parseTunnelbrokerQRAuthMessage,
   performBackupRestore,
   generateQRAuthAESKey,
 } from './qr-code/qr-code-utils.js';
 import ConnectivityUpdater from './redux/connectivity-updater.react.js';
 import { DimensionsUpdater } from './redux/dimensions-updater.react.js';
 import { getPersistor } from './redux/persist.js';
 import { store } from './redux/redux-setup.js';
 import { useSelector } from './redux/redux-utils.js';
 import { RootContext } from './root-context.js';
 import { MessageSearchProvider } from './search/search-provider.react.js';
 import Socket from './socket.react.js';
 import { useLoadCommFonts } from './themes/fonts.js';
 import { DarkTheme, LightTheme } from './themes/navigation.js';
 import ThemeHandler from './themes/theme-handler.react.js';
 import { provider } from './utils/ethers-utils.js';
 import { neynarKey } from './utils/neynar-utils.js';
 
 // Add custom items to expo-dev-menu
 import './dev-menu.js';
 import './types/message-types-validator.js';
 
 const navInitAction = Object.freeze({ type: 'NAV/@@INIT' });
 const navUnknownAction = Object.freeze({ type: 'NAV/@@UNKNOWN' });
 
 SplashScreen.preventAutoHideAsync().catch(console.log);
 
 function Root() {
   const navStateRef = React.useRef<?PossiblyStaleNavigationState>();
   const navDispatchRef =
     React.useRef<?(
       action:
         | GenericNavigationAction
         | (PossiblyStaleNavigationState => GenericNavigationAction),
     ) => void>();
   const navStateInitializedRef = React.useRef(false);
 
   // We call this here to start the loading process
   // We gate the UI on the fonts loading in AppNavigator
   useLoadCommFonts();
 
   const [navContext, setNavContext] = React.useState<?NavContextType>(null);
   const updateNavContext = React.useCallback(() => {
     if (
       !navStateRef.current ||
       !navDispatchRef.current ||
       !navStateInitializedRef.current
     ) {
       return;
     }
     const updatedNavContext = {
       state: navStateRef.current,
       dispatch: navDispatchRef.current,
     };
     setNavContext(updatedNavContext);
     setGlobalNavContext(updatedNavContext);
   }, []);
 
   const [initialState, setInitialState] = React.useState(
     __DEV__ ? undefined : defaultNavigationState,
   );
 
   React.useEffect(() => {
     Orientation.lockToPortrait();
     void (async () => {
       let loadedState = initialState;
       if (__DEV__) {
         try {
           const navStateString = await AsyncStorage.getItem(
             navStateAsyncStorageKey,
           );
           if (navStateString) {
             const savedState = JSON.parse(navStateString);
             if (validNavState(savedState)) {
               loadedState = savedState;
             }
           }
         } catch {}
       }
       if (!loadedState) {
         loadedState = defaultNavigationState;
       }
       if (loadedState !== initialState) {
         setInitialState(loadedState);
       }
       navStateRef.current = loadedState;
       updateNavContext();
       actionLogger.addOtherAction('navState', navInitAction, null, loadedState);
     })();
     // eslint-disable-next-line react-hooks/exhaustive-deps
   }, [updateNavContext]);
 
   const setNavStateInitialized = React.useCallback(() => {
     navStateInitializedRef.current = true;
     updateNavContext();
   }, [updateNavContext]);
 
   const [rootContext, setRootContext] = React.useState(() => ({
     setNavStateInitialized,
   }));
 
   const detectUnsupervisedBackgroundRef = React.useCallback(
     (detectUnsupervisedBackground: ?(alreadyClosed: boolean) => boolean) => {
       setRootContext(prevRootContext => ({
         ...prevRootContext,
         detectUnsupervisedBackground,
       }));
     },
     [],
   );
 
   const frozen = useSelector(state => state.frozen);
   const queuedActionsRef = React.useRef<Array<GenericNavigationAction>>([]);
   const onNavigationStateChange = React.useCallback(
     (state: ?PossiblyStaleNavigationState) => {
       invariant(state, 'nav state should be non-null');
       const prevState = navStateRef.current;
       navStateRef.current = state;
       updateNavContext();
 
       const queuedActions = queuedActionsRef.current;
       queuedActionsRef.current = [];
       if (queuedActions.length === 0) {
         queuedActions.push(navUnknownAction);
       }
       for (const action of queuedActions) {
         actionLogger.addOtherAction('navState', action, prevState, state);
       }
 
       if (!__DEV__ || frozen) {
         return;
       }
 
       void (async () => {
         try {
           await AsyncStorage.setItem(
             navStateAsyncStorageKey,
             JSON.stringify(state),
           );
         } catch (e) {
           console.log('AsyncStorage threw while trying to persist navState', e);
         }
       })();
     },
     [updateNavContext, frozen],
   );
 
   const navContainerRef =
     React.useRef<?React.ElementRef<typeof NavigationContainer>>();
   const containerRef = React.useCallback(
     (navContainer: ?React.ElementRef<typeof NavigationContainer>) => {
       navContainerRef.current = navContainer;
       if (navContainer && !navDispatchRef.current) {
         navDispatchRef.current = navContainer.dispatch;
         updateNavContext();
       }
     },
     [updateNavContext],
   );
   useReduxDevToolsExtension(navContainerRef);
 
   const navContainer = navContainerRef.current;
   React.useEffect(() => {
     if (!navContainer) {
       return undefined;
     }
     return navContainer.addListener(
       '__unsafe_action__',
       (event: { +data: UnsafeContainerActionEvent, ... }) => {
         const { action, noop } = event.data;
         const navState = navStateRef.current;
         if (noop) {
           actionLogger.addOtherAction('navState', action, navState, navState);
           return;
         }
         queuedActionsRef.current.push({
           ...action,
           type: `NAV/${action.type}`,
         });
       },
     );
   }, [navContainer]);
 
   const activeTheme = useSelector(state => state.globalThemeInfo.activeTheme);
   const theme = (() => {
     if (activeTheme === 'light') {
       return LightTheme;
     } else if (activeTheme === 'dark') {
       return DarkTheme;
     }
     return undefined;
   })();
 
   const gated: React.Node = (
     <>
       <LifecycleHandler />
       <KeyserverReachabilityHandler />
       <DimensionsUpdater />
       <ConnectivityUpdater />
       <ThemeHandler />
       <OrientationHandler />
       <BackupHandler />
       <IntegrityHandler />
       <AccessTokenHandler />
       <DBOpsHandler />
       <UserInfosHandler />
       <TunnelbrokerDeviceTokenHandler />
     </>
   );
   let navigation;
   if (initialState) {
     navigation = (
       <NavigationContainer
         initialState={initialState}
         onStateChange={onNavigationStateChange}
         theme={theme}
         ref={containerRef}
       >
         <BottomSheetModalProvider>
           <ChatContextProvider>
             <DeepLinksContextProvider>
               <ChatMentionContextProvider>
                 <NUXTipsContextProvider>
                   <RootNavigator />
                 </NUXTipsContextProvider>
               </ChatMentionContextProvider>
             </DeepLinksContextProvider>
           </ChatContextProvider>
           <NavigationHandler />
           <PersistedStateGate>
             <FarcasterDataHandler>
               <ConnectFarcasterAlertHandler />
             </FarcasterDataHandler>
           </PersistedStateGate>
         </BottomSheetModalProvider>
       </NavigationContainer>
     );
   }
   return (
     <GestureHandlerRootView style={styles.app}>
       <StaffContextProvider>
         <IdentityServiceContextProvider>
           <UserIdentityCacheProvider>
             <TunnelbrokerProvider>
               <IdentitySearchProvider>
                 <QRAuthProvider
                   parseTunnelbrokerQRAuthMessage={
                     parseTunnelbrokerQRAuthMessage
                   }
                   composeTunnelbrokerQRAuthMessage={
                     composeTunnelbrokerQRAuthMessage
                   }
                   generateAESKey={generateQRAuthAESKey}
                   performBackupRestore={performBackupRestore}
                   onLogInError={handleSecondaryDeviceLogInError}
                 >
                   <FeatureFlagsProvider>
                     <NavContext.Provider value={navContext}>
                       <RootContext.Provider value={rootContext}>
                         <InputStateContainer>
                           <MessageEditingContextProvider>
                             <SafeAreaProvider
                               initialMetrics={initialWindowMetrics}
                             >
                               <ActionSheetProvider>
                                 <ENSCacheProvider provider={provider}>
                                   <NeynarClientProvider apiKey={neynarKey}>
                                     <MediaCacheProvider
                                       persistence={filesystemMediaCache}
                                     >
                                       <EditUserAvatarProvider>
                                         <NativeEditThreadAvatarProvider>
                                           <MarkdownContextProvider>
                                             <MessageSearchProvider>
                                               <BottomSheetProvider>
                                                 <RegistrationContextProvider>
                                                   <SQLiteDataHandler />
                                                   <ConnectedStatusBar />
                                                   <ReduxPersistGate
                                                     persistor={getPersistor()}
                                                   >
                                                     {gated}
                                                   </ReduxPersistGate>
                                                   <PersistedStateGate>
                                                     <KeyserverConnectionsHandler
                                                       socketComponent={Socket}
                                                       detectUnsupervisedBackgroundRef={
                                                         detectUnsupervisedBackgroundRef
                                                       }
                                                     />
+                                                    <DMActivityHandler />
                                                     <VersionSupportedChecker />
                                                     <PlatformDetailsSynchronizer />
                                                     <BackgroundIdentityLoginHandler />
                                                     <PrekeysHandler />
                                                     <ReportHandler />
                                                     <AutoJoinCommunityHandler />
                                                   </PersistedStateGate>
                                                   {navigation}
                                                 </RegistrationContextProvider>
                                               </BottomSheetProvider>
                                             </MessageSearchProvider>
                                           </MarkdownContextProvider>
                                         </NativeEditThreadAvatarProvider>
                                       </EditUserAvatarProvider>
                                     </MediaCacheProvider>
                                   </NeynarClientProvider>
                                 </ENSCacheProvider>
                               </ActionSheetProvider>
                             </SafeAreaProvider>
                           </MessageEditingContextProvider>
                         </InputStateContainer>
                       </RootContext.Provider>
                     </NavContext.Provider>
                   </FeatureFlagsProvider>
                 </QRAuthProvider>
               </IdentitySearchProvider>
             </TunnelbrokerProvider>
           </UserIdentityCacheProvider>
         </IdentityServiceContextProvider>
       </StaffContextProvider>
     </GestureHandlerRootView>
   );
 }
 
 const styles = StyleSheet.create({
   app: {
     flex: 1,
   },
 });
 
 function AppRoot(): React.Node {
   return (
     <Provider store={store}>
       <CallKeyserverEndpointProvider>
         <ErrorBoundary>
           <Root />
         </ErrorBoundary>
       </CallKeyserverEndpointProvider>
     </Provider>
   );
 }
 
 export default AppRoot;
diff --git a/web/app.react.js b/web/app.react.js
index 0f4acec8c..83f5c1bae 100644
--- a/web/app.react.js
+++ b/web/app.react.js
@@ -1,598 +1,600 @@
 // @flow
 
 import 'basscss/css/basscss.min.css';
 import './theme.css';
 import { config as faConfig } from '@fortawesome/fontawesome-svg-core';
 import classnames from 'classnames';
 import _isEqual from 'lodash/fp/isEqual.js';
 import * as React from 'react';
 import { DndProvider } from 'react-dnd';
 import { HTML5Backend } from 'react-dnd-html5-backend';
 
 import {
   fetchEntriesActionTypes,
   updateCalendarQueryActionTypes,
 } from 'lib/actions/entry-actions.js';
 import { ChatMentionContextProvider } from 'lib/components/chat-mention-provider.react.js';
 import { EditUserAvatarProvider } from 'lib/components/edit-user-avatar-provider.react.js';
 import { FarcasterDataHandler } from 'lib/components/farcaster-data-handler.react.js';
 import {
   ModalProvider,
   useModalContext,
 } from 'lib/components/modal-provider.react.js';
 import { NeynarClientProvider } from 'lib/components/neynar-client-provider.react.js';
 import PlatformDetailsSynchronizer from 'lib/components/platform-details-synchronizer.react.js';
 import { QRAuthProvider } from 'lib/components/qr-auth-provider.react.js';
 import { StaffContextProvider } from 'lib/components/staff-provider.react.js';
 import { DBOpsHandler } from 'lib/handlers/db-ops-handler.react.js';
 import { TunnelbrokerDeviceTokenHandler } from 'lib/handlers/tunnelbroker-device-token-handler.react.js';
 import { UserInfosHandler } from 'lib/handlers/user-infos-handler.react.js';
 import { IdentitySearchProvider } from 'lib/identity-search/identity-search-context.js';
 import {
   createLoadingStatusSelector,
   combineLoadingStatuses,
 } from 'lib/selectors/loading-selectors.js';
 import { isLoggedIn } from 'lib/selectors/user-selectors.js';
 import { extractMajorDesktopVersion } from 'lib/shared/version-utils.js';
 import type { SecondaryTunnelbrokerConnection } from 'lib/tunnelbroker/secondary-tunnelbroker-connection.js';
 import { TunnelbrokerProvider } from 'lib/tunnelbroker/tunnelbroker-context.js';
 import type { LoadingStatus } from 'lib/types/loading-types.js';
 import type { WebNavInfo } from 'lib/types/nav-types.js';
 import type { Dispatch } from 'lib/types/redux-types.js';
 import type { MessageToDeviceRequest } from 'lib/types/tunnelbroker/message-to-device-request-types.js';
 import { getConfig, registerConfig } from 'lib/utils/config.js';
 import { useDispatch } from 'lib/utils/redux-utils.js';
 import { infoFromURL } from 'lib/utils/url-utils.js';
 import { AlchemyENSCacheProvider } from 'lib/utils/wagmi-utils.js';
 
 import QRCodeLogin from './account/qr-code-login.react.js';
 import AppThemeWrapper from './app-theme-wrapper.react.js';
 import { authoritativeKeyserverID } from './authoritative-keyserver.js';
 import WebEditThreadAvatarProvider from './avatars/web-edit-thread-avatar-provider.react.js';
 import Calendar from './calendar/calendar.react.js';
 import Chat from './chat/chat.react.js';
 import { EditModalProvider } from './chat/edit-message-provider.js';
 import { MemberListSidebarProvider } from './chat/member-list-sidebar/member-list-sidebar-provider.react.js';
 import { AutoJoinCommunityHandler } from './components/auto-join-community-handler.react.js';
 import CommunitiesRefresher from './components/communities-refresher.react.js';
+import DMActivityHandler from './components/dm-activity-handler.react.js';
 import LogOutIfMissingCSATHandler from './components/log-out-if-missing-csat-handler.react.js';
 import NavigationArrows from './components/navigation-arrows.react.js';
 import MinVersionHandler from './components/version-handler.react.js';
 import { olmAPI } from './crypto/olm-api.js';
 import { sqliteAPI } from './database/sqlite-api.js';
 import electron from './electron.js';
 import InputStateContainer from './input/input-state-container.react.js';
 import InviteLinkHandler from './invite-links/invite-link-handler.react.js';
 import InviteLinksRefresher from './invite-links/invite-links-refresher.react.js';
 import LoadingIndicator from './loading-indicator.react.js';
 import { MenuProvider } from './menu-provider.react.js';
 import UpdateModalHandler from './modals/update-modal.react.js';
 import SettingsSwitcher from './navigation-panels/settings-switcher.react.js';
 import Topbar from './navigation-panels/topbar.react.js';
 import BadgeHandler from './push-notif/badge-handler.react.js';
 import encryptedNotifUtilsAPI from './push-notif/encrypted-notif-utils-api.js';
 import { PushNotificationsHandler } from './push-notif/push-notifs-handler.js';
 import { updateNavInfoActionType } from './redux/action-types.js';
 import DisconnectedBar from './redux/disconnected-bar.js';
 import FocusHandler from './redux/focus-handler.react.js';
 import { KeyserverReachabilityHandler } from './redux/keyserver-reachability-handler.js';
 import { persistConfig } from './redux/persist.js';
 import PolicyAcknowledgmentHandler from './redux/policy-acknowledgment-handler.js';
 import { useSelector } from './redux/redux-utils.js';
 import VisibilityHandler from './redux/visibility-handler.react.js';
 import history from './router-history.js';
 import { MessageSearchStateProvider } from './search/message-search-state-provider.react.js';
 import AccountSettings from './settings/account-settings.react.js';
 import DangerZone from './settings/danger-zone.react.js';
 import KeyserverSelectionList from './settings/keyserver-selection-list.react.js';
 import { getCommSharedWorker } from './shared-worker/shared-worker-provider.js';
 import CommunityPicker from './sidebar/community-picker.react.js';
 import Splash from './splash/splash.react.js';
 import './typography.css';
 import css from './style.css';
 import { TooltipProvider } from './tooltips/tooltip-provider.js';
 import { canonicalURLFromReduxState, navInfoFromURL } from './url-utils.js';
 import {
   composeTunnelbrokerQRAuthMessage,
   generateQRAuthAESKey,
   parseTunnelbrokerQRAuthMessage,
   useHandleSecondaryDeviceLogInError,
 } from './utils/qr-code-utils.js';
 import { useWebLock, TUNNELBROKER_LOCK_NAME } from './web-lock.js';
 
 // We want Webpack's css-loader and style-loader to handle the Fontawesome CSS,
 // so we disable the autoAddCss logic and import the CSS file. Otherwise every
 // icon flashes huge for a second before the CSS is loaded.
 import '@fortawesome/fontawesome-svg-core/styles.css';
 
 faConfig.autoAddCss = false;
 const desktopDetails = electron?.version
   ? { majorDesktopVersion: extractMajorDesktopVersion(electron?.version) }
   : null;
 
 registerConfig({
   // We can't securely cache credentials on web
   resolveKeyserverSessionInvalidationUsingNativeCredentials: null,
   setSessionIDOnRequest: true,
   // Never reset the calendar range
   calendarRangeInactivityLimit: null,
   platformDetails: {
     platform: electron?.platform ?? 'web',
     codeVersion: 113,
     stateVersion: persistConfig.version,
     ...desktopDetails,
   },
   authoritativeKeyserverID,
   olmAPI,
   sqliteAPI,
   encryptedNotifUtilsAPI,
 });
 
 const versionBroadcast = new BroadcastChannel('comm_version');
 versionBroadcast.postMessage(getConfig().platformDetails.codeVersion);
 versionBroadcast.onmessage = (event: MessageEvent) => {
   if (event.data && event.data !== getConfig().platformDetails.codeVersion) {
     location.reload();
   }
 };
 
 // Start initializing the shared worker immediately
 void getCommSharedWorker();
 
 type BaseProps = {
   +location: {
     +pathname: string,
     ...
   },
 };
 type Props = {
   ...BaseProps,
   // Redux state
   +navInfo: WebNavInfo,
   +entriesLoadingStatus: LoadingStatus,
   +loggedIn: boolean,
   +activeThreadCurrentlyUnread: boolean,
   // Redux dispatch functions
   +dispatch: Dispatch,
   +modals: $ReadOnlyArray<React.Node>,
 };
 
 class App extends React.PureComponent<Props> {
   componentDidMount() {
     const {
       navInfo,
       location: { pathname },
       loggedIn,
     } = this.props;
     const newURL = canonicalURLFromReduxState(navInfo, pathname, loggedIn);
     if (pathname !== newURL) {
       history.replace(newURL);
     }
   }
 
   componentDidUpdate(prevProps: Props) {
     const {
       navInfo,
       location: { pathname },
       loggedIn,
     } = this.props;
     if (!_isEqual(navInfo)(prevProps.navInfo)) {
       const newURL = canonicalURLFromReduxState(navInfo, pathname, loggedIn);
       if (newURL !== pathname) {
         history.push(newURL);
       }
     } else if (pathname !== prevProps.location.pathname) {
       const urlInfo = infoFromURL(pathname);
       const newNavInfo = navInfoFromURL(urlInfo, { navInfo });
       if (!_isEqual(newNavInfo)(navInfo)) {
         this.props.dispatch({
           type: updateNavInfoActionType,
           payload: newNavInfo,
         });
       }
     } else if (loggedIn !== prevProps.loggedIn) {
       const newURL = canonicalURLFromReduxState(navInfo, pathname, loggedIn);
       if (newURL !== pathname) {
         history.replace(newURL);
       }
     }
     if (loggedIn !== prevProps.loggedIn) {
       electron?.clearHistory();
     }
   }
 
   onWordmarkClicked = () => {
     this.props.dispatch({
       type: updateNavInfoActionType,
       payload: { tab: 'chat' },
     });
   };
 
   render(): React.Node {
     let content;
     if (this.props.loggedIn) {
       content = (
         <>
           <WebEditThreadAvatarProvider>
             <EditUserAvatarProvider>
               <StaffContextProvider>
                 <MemberListSidebarProvider>
                   {this.renderMainContent()}
                   {this.props.modals}
                 </MemberListSidebarProvider>
               </StaffContextProvider>
             </EditUserAvatarProvider>
           </WebEditThreadAvatarProvider>
         </>
       );
     } else {
       content = (
         <>
           {this.renderLoginPage()}
           {this.props.modals}
         </>
       );
     }
     return (
       <DndProvider backend={HTML5Backend}>
         <EditModalProvider>
           <MenuProvider>
             <AlchemyENSCacheProvider>
               <NeynarClientProvider apiKey={process.env.COMM_NEYNAR_KEY}>
                 <TooltipProvider>
                   <MessageSearchStateProvider>
                     <ChatMentionContextProvider>
                       <FocusHandler />
                       <VisibilityHandler />
                       <PolicyAcknowledgmentHandler />
                       <PushNotificationsHandler />
                       <InviteLinkHandler />
                       <InviteLinksRefresher />
                       <CommunitiesRefresher />
                       <MinVersionHandler />
                       <PlatformDetailsSynchronizer />
                       <LogOutIfMissingCSATHandler />
                       <UserInfosHandler />
                       <TunnelbrokerDeviceTokenHandler />
                       <FarcasterDataHandler />
                       <AutoJoinCommunityHandler />
+                      <DMActivityHandler />
                       {content}
                     </ChatMentionContextProvider>
                   </MessageSearchStateProvider>
                 </TooltipProvider>
               </NeynarClientProvider>
             </AlchemyENSCacheProvider>
           </MenuProvider>
         </EditModalProvider>
       </DndProvider>
     );
   }
 
   onHeaderDoubleClick = (): void => electron?.doubleClickTopBar();
   stopDoubleClickPropagation: ?(SyntheticEvent<HTMLAnchorElement>) => void =
     electron ? e => e.stopPropagation() : null;
 
   renderLoginPage(): React.Node {
     const { loginMethod } = this.props.navInfo;
 
     if (loginMethod === 'qr-code') {
       return <QRCodeLogin />;
     }
 
     return <Splash />;
   }
 
   renderMainContent(): React.Node {
     const mainContent = this.getMainContentWithSwitcher();
 
     let navigationArrows = null;
     if (electron) {
       navigationArrows = <NavigationArrows />;
     }
 
     const headerClasses = classnames({
       [css.header]: true,
       [css['electron-draggable']]: electron,
     });
 
     const wordmarkClasses = classnames({
       [css.wordmark]: true,
       [css['electron-non-draggable']]: electron,
       [css['wordmark-macos']]: electron?.platform === 'macos',
     });
 
     return (
       <div className={css.layout}>
         <KeyserverReachabilityHandler />
         <DisconnectedBar />
         <UpdateModalHandler />
         <header
           className={headerClasses}
           onDoubleClick={this.onHeaderDoubleClick}
         >
           <div className={css['main-header']}>
             <h1 className={wordmarkClasses}>
               <a
                 title="Comm Home"
                 aria-label="Go to Comm Home"
                 onClick={this.onWordmarkClicked}
                 onDoubleClick={this.stopDoubleClickPropagation}
               >
                 Comm
               </a>
             </h1>
             {navigationArrows}
             <div className={css['upper-right']}>
               <LoadingIndicator
                 status={this.props.entriesLoadingStatus}
                 size="medium"
                 loadingClassName={css['page-loading']}
                 errorClassName={css['page-error']}
               />
             </div>
           </div>
         </header>
         <InputStateContainer>{mainContent}</InputStateContainer>
         <div className={css.sidebar}>
           <CommunityPicker />
         </div>
       </div>
     );
   }
 
   getMainContentWithSwitcher(): React.Node {
     const { tab, settingsSection } = this.props.navInfo;
     let mainContent: React.Node;
 
     if (tab === 'settings') {
       if (settingsSection === 'account') {
         mainContent = <AccountSettings />;
       } else if (settingsSection === 'friend-list') {
         mainContent = null;
       } else if (settingsSection === 'block-list') {
         mainContent = null;
       } else if (settingsSection === 'keyservers') {
         mainContent = <KeyserverSelectionList />;
       } else if (settingsSection === 'build-info') {
         mainContent = null;
       } else if (settingsSection === 'danger-zone') {
         mainContent = <DangerZone />;
       }
       return (
         <div className={css['main-content-container']}>
           <div className={css.switcher}>
             <SettingsSwitcher />
           </div>
           <div className={css['main-content']}>{mainContent}</div>
         </div>
       );
     }
 
     if (tab === 'calendar') {
       mainContent = <Calendar url={this.props.location.pathname} />;
     } else if (tab === 'chat') {
       mainContent = <Chat />;
     }
 
     const mainContentClass = classnames(
       css['main-content-container'],
       css['main-content-container-column'],
     );
     return (
       <div className={mainContentClass}>
         <Topbar />
         <div className={css['main-content']}>{mainContent}</div>
       </div>
     );
   }
 }
 
 const WEB_TUNNELBROKER_CHANNEL = new BroadcastChannel('shared-tunnelbroker');
 const WEB_TUNNELBROKER_MESSAGE_TYPES = Object.freeze({
   SEND_MESSAGE: 'send-message',
   MESSAGE_STATUS: 'message-status',
 });
 
 function useOtherTabsTunnelbrokerConnection(): SecondaryTunnelbrokerConnection {
   const onSendMessageCallbacks = React.useRef<
     Set<(MessageToDeviceRequest) => mixed>,
   >(new Set());
 
   const onMessageStatusCallbacks = React.useRef<
     Set<(messageID: string, error: ?string) => mixed>,
   >(new Set());
 
   React.useEffect(() => {
     const messageHandler = (event: MessageEvent) => {
       if (typeof event.data !== 'object' || !event.data) {
         console.log(
           'Invalid message received from shared ' +
             'tunnelbroker broadcast channel',
           event.data,
         );
         return;
       }
       const data = event.data;
       if (data.type === WEB_TUNNELBROKER_MESSAGE_TYPES.SEND_MESSAGE) {
         if (typeof data.message !== 'object' || !data.message) {
           console.log(
             'Invalid tunnelbroker message request received ' +
               'from shared tunnelbroker broadcast channel',
             event.data,
           );
           return;
         }
         // We know that the input was already validated
         const message: MessageToDeviceRequest = (data.message: any);
 
         for (const callback of onSendMessageCallbacks.current) {
           callback(message);
         }
       } else if (data.type === WEB_TUNNELBROKER_MESSAGE_TYPES.MESSAGE_STATUS) {
         if (typeof data.messageID !== 'string') {
           console.log(
             'Missing message id in message status message ' +
               'from shared tunnelbroker broadcast channel',
           );
           return;
         }
         const messageID = data.messageID;
 
         if (
           typeof data.error !== 'string' &&
           data.error !== null &&
           data.error !== undefined
         ) {
           console.log(
             'Invalid error in message status message ' +
               'from shared tunnelbroker broadcast channel',
             data.error,
           );
           return;
         }
         const error = data.error;
 
         for (const callback of onMessageStatusCallbacks.current) {
           callback(messageID, error);
         }
       } else {
         console.log(
           'Invalid message type ' +
             'from shared tunnelbroker broadcast channel',
           data,
         );
       }
     };
 
     WEB_TUNNELBROKER_CHANNEL.addEventListener('message', messageHandler);
     return () =>
       WEB_TUNNELBROKER_CHANNEL.removeEventListener('message', messageHandler);
   }, [onMessageStatusCallbacks, onSendMessageCallbacks]);
 
   return React.useMemo(
     () => ({
       sendMessage: message =>
         WEB_TUNNELBROKER_CHANNEL.postMessage({
           type: WEB_TUNNELBROKER_MESSAGE_TYPES.SEND_MESSAGE,
           message,
         }),
       onSendMessage: callback => {
         onSendMessageCallbacks.current.add(callback);
         return () => {
           onSendMessageCallbacks.current.delete(callback);
         };
       },
       setMessageStatus: (messageID, error) => {
         WEB_TUNNELBROKER_CHANNEL.postMessage({
           type: WEB_TUNNELBROKER_MESSAGE_TYPES.MESSAGE_STATUS,
           messageID,
           error,
         });
       },
       onMessageStatus: callback => {
         onMessageStatusCallbacks.current.add(callback);
         return () => {
           onMessageStatusCallbacks.current.delete(callback);
         };
       },
     }),
     [onMessageStatusCallbacks, onSendMessageCallbacks],
   );
 }
 
 const fetchEntriesLoadingStatusSelector = createLoadingStatusSelector(
   fetchEntriesActionTypes,
 );
 const updateCalendarQueryLoadingStatusSelector = createLoadingStatusSelector(
   updateCalendarQueryActionTypes,
 );
 
 const ConnectedApp: React.ComponentType<BaseProps> = React.memo<BaseProps>(
   function ConnectedApp(props) {
     const activeChatThreadID = useSelector(
       state => state.navInfo.activeChatThreadID,
     );
     const navInfo = useSelector(state => state.navInfo);
 
     const fetchEntriesLoadingStatus = useSelector(
       fetchEntriesLoadingStatusSelector,
     );
     const updateCalendarQueryLoadingStatus = useSelector(
       updateCalendarQueryLoadingStatusSelector,
     );
     const entriesLoadingStatus = combineLoadingStatuses(
       fetchEntriesLoadingStatus,
       updateCalendarQueryLoadingStatus,
     );
 
     const loggedIn = useSelector(isLoggedIn);
     const activeThreadCurrentlyUnread = useSelector(
       state =>
         !activeChatThreadID ||
         !!state.threadStore.threadInfos[activeChatThreadID]?.currentUser.unread,
     );
 
     const dispatch = useDispatch();
     const modalContext = useModalContext();
     const modals = React.useMemo(
       () =>
         modalContext.modals.map(([modal, key]) => (
           <React.Fragment key={key}>{modal}</React.Fragment>
         )),
       [modalContext.modals],
     );
 
     const { lockStatus, releaseLockOrAbortRequest } = useWebLock(
       TUNNELBROKER_LOCK_NAME,
     );
 
     const secondaryTunnelbrokerConnection: SecondaryTunnelbrokerConnection =
       useOtherTabsTunnelbrokerConnection();
 
     const handleSecondaryDeviceLogInError =
       useHandleSecondaryDeviceLogInError();
 
     return (
       <AppThemeWrapper>
         <TunnelbrokerProvider
           shouldBeClosed={lockStatus !== 'acquired'}
           onClose={releaseLockOrAbortRequest}
           secondaryTunnelbrokerConnection={secondaryTunnelbrokerConnection}
         >
           <BadgeHandler />
           <IdentitySearchProvider>
             <QRAuthProvider
               parseTunnelbrokerQRAuthMessage={parseTunnelbrokerQRAuthMessage}
               composeTunnelbrokerQRAuthMessage={
                 composeTunnelbrokerQRAuthMessage
               }
               generateAESKey={generateQRAuthAESKey}
               onLogInError={handleSecondaryDeviceLogInError}
             >
               <App
                 {...props}
                 navInfo={navInfo}
                 entriesLoadingStatus={entriesLoadingStatus}
                 loggedIn={loggedIn}
                 activeThreadCurrentlyUnread={activeThreadCurrentlyUnread}
                 dispatch={dispatch}
                 modals={modals}
               />
             </QRAuthProvider>
             <DBOpsHandler />
           </IdentitySearchProvider>
         </TunnelbrokerProvider>
       </AppThemeWrapper>
     );
   },
 );
 
 function AppWithProvider(props: BaseProps): React.Node {
   return (
     <ModalProvider>
       <ConnectedApp {...props} />
     </ModalProvider>
   );
 }
 
 export default AppWithProvider;
diff --git a/web/components/dm-activity-handler.react.js b/web/components/dm-activity-handler.react.js
new file mode 100644
index 000000000..71d55e568
--- /dev/null
+++ b/web/components/dm-activity-handler.react.js
@@ -0,0 +1,27 @@
+// @flow
+import * as React from 'react';
+
+import useDMActivityHandler from 'lib/handlers/dm-activity-handler.js';
+import { isLoggedIn } from 'lib/selectors/user-selectors.js';
+
+import { useSelector } from '../redux/redux-utils.js';
+import { activeThreadSelector } from '../selectors/nav-selectors.js';
+
+function DMActivityHandler(): React.Node {
+  const active = useSelector(
+    state => isLoggedIn(state) && state.lifecycleState !== 'background',
+  );
+  const reduxActiveThread = useSelector(activeThreadSelector);
+  const windowActive = useSelector(state => state.windowActive);
+  const activeThread = React.useMemo(() => {
+    if (!active || !windowActive) {
+      return null;
+    }
+    return reduxActiveThread;
+  }, [active, windowActive, reduxActiveThread]);
+
+  useDMActivityHandler(activeThread);
+  return null;
+}
+
+export default DMActivityHandler;