diff --git a/packages/element-web-module-api/element-web-module-api.api.md b/packages/element-web-module-api/element-web-module-api.api.md
index a93fdbbfb3..56fa2bb06b 100644
--- a/packages/element-web-module-api/element-web-module-api.api.md
+++ b/packages/element-web-module-api/element-web-module-api.api.md
@@ -283,6 +283,7 @@ export type OriginalMessageComponentProps = {
 // @public
 export interface Profile {
     displayName?: string;
+    isGuest?: boolean;
     userId?: string;
 }
 
@@ -312,6 +313,9 @@ export interface UserIdentifierCustomisations {
     }): string | null;
 }
 
+// @public
+export function useWatchable<T>(watchable: Watchable<T>): T;
+
 // @public
 export type Variables = {
     count?: number;
diff --git a/packages/element-web-module-api/package.json b/packages/element-web-module-api/package.json
index a3c6a78a47..c98d0803f3 100644
--- a/packages/element-web-module-api/package.json
+++ b/packages/element-web-module-api/package.json
@@ -39,6 +39,7 @@
         "@types/semver": "^7.5.8",
         "@vitest/coverage-v8": "^3.0.4",
         "matrix-web-i18n": "^3.3.0",
+        "rollup-plugin-external-globals": "^0.13.0",
         "semver": "^7.6.3",
         "typescript": "^5.7.3",
         "vite": "^6.1.6",
diff --git a/packages/element-web-module-api/src/api/profile.ts b/packages/element-web-module-api/src/api/profile.ts
index 097a28d86f..5a09537587 100644
--- a/packages/element-web-module-api/src/api/profile.ts
+++ b/packages/element-web-module-api/src/api/profile.ts
@@ -12,6 +12,10 @@ import { Watchable } from "./watchable.ts";
  * @public
  */
 export interface Profile {
+    /**
+     * Indicates whether the user is a guest user.
+     */
+    isGuest?: boolean;
     /**
      * The user ID of the logged-in user, if undefined then no user is logged in.
      */
diff --git a/packages/element-web-module-api/src/api/watchable.ts b/packages/element-web-module-api/src/api/watchable.ts
index 4bd8d74239..2f82a9b732 100644
--- a/packages/element-web-module-api/src/api/watchable.ts
+++ b/packages/element-web-module-api/src/api/watchable.ts
@@ -5,6 +5,8 @@ SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
 Please see LICENSE files in the repository root for full details.
 */
 
+import { useEffect, useState } from "react";
+
 type WatchFn<T> = (value: T) => void;
 
 function shallowCompare<T extends object>(obj1: T, obj2: T): boolean {
@@ -55,3 +57,21 @@ export class Watchable<T> {
         this.listeners.delete(listener);
     }
 }
+
+/**
+ * A React hook to use an updated Watchable value.
+ * @param watchable - The Watchable instance to watch.
+ * @returns The live value of the Watchable.
+ * @public
+ */
+export function useWatchable<T>(watchable: Watchable<T>): T {
+    const [value, setValue] = useState<T>(watchable.value);
+    useEffect(() => {
+        setValue(watchable.value);
+        watchable.watch(setValue);
+        return (): void => {
+            watchable.unwatch(setValue);
+        };
+    }, [watchable]);
+    return value;
+}
diff --git a/packages/element-web-module-api/vite.config.ts b/packages/element-web-module-api/vite.config.ts
index 6b0d47a8a2..01d3eebba6 100644
--- a/packages/element-web-module-api/vite.config.ts
+++ b/packages/element-web-module-api/vite.config.ts
@@ -9,6 +9,7 @@ import { dirname, resolve } from "node:path";
 import { fileURLToPath } from "node:url";
 import { defineConfig } from "vite";
 import dts from "vite-plugin-dts";
+import externalGlobals from "rollup-plugin-external-globals";
 
 const __dirname = dirname(fileURLToPath(import.meta.url));
 
@@ -23,9 +24,18 @@ export default defineConfig({
         target: "esnext",
         sourcemap: true,
     },
-    plugins: [dts()],
+    plugins: [
+        dts(),
+        externalGlobals({
+            // Reuse React from the host app
+            react: "window.React",
+        }),
+    ],
     define: {
         __VERSION__: JSON.stringify(process.env.npm_package_version),
+        // Use production mode for the build as it is tested against production builds of Element Web,
+        // this is required for React JSX versions to be compatible.
+        process: { env: { NODE_ENV: "production" } },
     },
     test: {
         coverage: {