diff --git a/web/app.js b/web/app.js
index 81a1c6b..062a37b 100644
--- a/web/app.js
+++ b/web/app.js
@@ -515,3 +515,8 @@ refreshTexts();
 connectWS();
 setInterval(refreshProposals, 5000);
 setInterval(refreshTexts, 8000);
+
+// Optional demo mode: http://.../?replay=1 auto-starts replay
+if (location.search.includes('replay=1')) {
+  setTimeout(loadReplay, 600);
+}