diff --git a/keyserver/src/keyserver.js b/keyserver/src/keyserver.js
--- a/keyserver/src/keyserver.js
+++ b/keyserver/src/keyserver.js
@@ -109,12 +109,6 @@
         downloadHandler(uploadDownloadResponder),
       );
 
-      // This endpoint should be handled by the mobile app. If the server
-      // receives this request, it means that the app is not installed and we
-      // should redirect the user to a place from which the app can be
-      // downloaded.
-      router.get('/invite/:secret', inviteResponder);
-
       // $FlowFixMe express-ws has side effects that can't be typed
       router.ws('/ws', onConnection);
       router.get('/worker/:worker', webWorkerResponder);
@@ -147,6 +141,12 @@
       server.use(landingBaseRoutePath, landingRouter);
     }
 
+    // This endpoint should be handled by the mobile app. If the server
+    // receives this request, it means that the app is not installed and we
+    // should redirect the user to a place from which the app can be
+    // downloaded.
+    server.get('/invite/:secret', inviteResponder);
+
     if (commAppBaseRoutePath) {
       const commAppRouter = express.Router();
       setupAppRouter(commAppRouter);
diff --git a/keyserver/src/responders/website-responders.js b/keyserver/src/responders/website-responders.js
--- a/keyserver/src/responders/website-responders.js
+++ b/keyserver/src/responders/website-responders.js
@@ -61,7 +61,10 @@
 import { setNewSession } from '../session/cookies.js';
 import { Viewer } from '../session/viewer.js';
 import { streamJSON, waitForStream } from '../utils/json-stream.js';
-import { getAppURLFactsFromRequestURL } from '../utils/urls.js';
+import {
+  getAppURLFactsFromRequestURL,
+  getCommAppURLFacts,
+} from '../utils/urls.js';
 import { validateOutput } from '../utils/validation-utils.js';
 
 const { renderToNodeStream } = ReactDOMServer;
@@ -569,6 +572,14 @@
     });
     res.end();
     return;
+  } else if (detectionResult.os !== 'iOS') {
+    const baseRoutePath = getCommAppURLFacts()?.baseRoutePath;
+    const redirectUrl = `${baseRoutePath ?? '/'}handle/invite/${secret}`;
+    res.writeHead(301, {
+      Location: redirectUrl,
+    });
+    res.end();
+    return;
   }
   const fontsURL = await getFontsURL();
   res.end(html`