diff --git a/src-11ty/404.njk b/src-11ty/404.njk
new file mode 100644
index 0000000..0be1325
--- /dev/null
+++ b/src-11ty/404.njk
@@ -0,0 +1,52 @@
+---
+layout: base.html
+title: Page not found
+description: The page you were looking for could not be found.
+permalink: /404.html
+---
+
+<style>
+  .not-found {
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+    justify-content: center;
+    text-align: center;
+    padding: 80px 20px;
+    max-width: 600px;
+    margin: 0 auto;
+    color: var(--app-text-primary);
+  }
+
+  .not-found .code {
+    font-size: 5rem;
+    font-weight: 700;
+    margin: 0;
+    line-height: 1;
+    color: var(--app-text-primary);
+  }
+
+  .not-found h1 {
+    font-size: 1.75rem;
+    margin: 16px 0 8px;
+  }
+
+  .not-found p {
+    color: var(--app-text-secondary);
+    line-height: 1.6;
+    margin: 0 0 24px;
+  }
+</style>
+
+<div class="not-found">
+  <p class="code">404</p>
+  <h1>Page not found</h1>
+  <p>The page you were looking for could not be found.</p>
+  <a href="/">Go back home</a>
+</div>
+
+<script>
+  document.addEventListener('DOMContentLoaded', function () {
+    plausible('404');
+  });
+</script>
diff --git a/src-11ty/_includes/base.html b/src-11ty/_includes/base.html
index 41b837a..83cbf3a 100644
--- a/src-11ty/_includes/base.html
+++ b/src-11ty/_includes/base.html
@@ -21,6 +21,25 @@
     <meta property="og:type" content="website" />
 
     <link rel="stylesheet" href="/src/styles/main.css" />
+
+    <!-- Plausible analytics -->
+    <script
+      async
+      src="https://plausible.openhomefoundation.org/js/pa-EkXAQjbzUhwwqEPi6iRK5.js"
+    ></script>
+    <script>
+      window.plausible =
+        window.plausible ||
+        function () {
+          (plausible.q = plausible.q || []).push(arguments);
+        };
+      plausible.init =
+        plausible.init ||
+        function (i) {
+          plausible.o = i || {};
+        };
+      plausible.init();
+    </script>
   </head>
   <body class="wa-palette-shoelace wa-theme-shoelace">
     <div class="app-header">
@@ -45,7 +64,7 @@
             class="nav-link"
             target="_blank"
           >
-            OHF
+            Open Home Foundation
           </a>
           <a
             href="https://www.home-assistant.io/"
@@ -58,6 +77,22 @@
       </header>
     </div>
     {{ content | safe }}
+    <footer class="app-footer">
+      <p>
+        This website uses
+        <a
+          href="https://www.openhomefoundation.org/blog/making-our-web-analytics-open-source-with-plausible/"
+          rel="noopener"
+          >privacy-first analytics</a
+        >
+        to help us improve the site. You can view all data in our
+        <a
+          href="https://plausible.openhomefoundation.org/toolbox.openhomefoundation.org"
+          rel="noopener"
+          >public dashboard</a
+        >.
+      </p>
+    </footer>
     <script>
       (function () {
         const updateTheme = () => {
diff --git a/src/styles/main.css b/src/styles/main.css
index b4c997b..94ea51d 100644
--- a/src/styles/main.css
+++ b/src/styles/main.css
@@ -141,3 +141,22 @@ body {
   width: 14px;
   height: 14px;
 }
+
+.app-footer {
+  text-align: center;
+  padding: 24px 20px;
+}
+
+.app-footer p {
+  margin: 0 auto;
+  max-width: 30rem;
+  font-size: 0.8rem;
+  color: var(--app-text-secondary);
+  line-height: 1.5;
+  text-wrap: balance;
+}
+
+.app-footer a {
+  color: var(--wa-color-brand-50);
+}
+
diff --git a/vite.config.ts b/vite.config.ts
index d35498e..9bc66d5 100644
--- a/vite.config.ts
+++ b/vite.config.ts
@@ -41,6 +41,9 @@ export default defineConfig({
               );
               if (fs.existsSync(indexPath)) {
                 req.url = req.url + '/index.html';
+              } else {
+                // Unknown route: serve the 404 page
+                req.url = '/404.html';
               }
             }
           }
@@ -65,6 +68,7 @@ export default defineConfig({
     rollupOptions: {
       input: {
         main: resolve(__dirname, 'dist/index.html'),
+        notFound: resolve(__dirname, 'dist/404.html'),
         homeAssistantVoicePreviewEdition: resolve(
           __dirname,
           'dist/home-assistant-voice-preview-edition/index.html'
