Match the on-screen prompt with your hands, beat the countdown, and climb the shared leaderboard. Perfect
for lightning-fast energy boosts during planning or retro breaks.
Not connected
Room
Play
Waiting for host to start the next round…
Enable your camera to begin.
Ready?
Players in room
Results persist across rounds. ✓ = played this session, ⏳ = waiting to play.
How it works
Set a display name and start a room. Share the invite link with teammates.
Enable your camera, then tap “Start reaction round”. A random number or emoji appears after a short delay.
Mimic the prompt. As soon as your hands match, your reaction time locks in.
The leaderboard updates live so everyone sees the fastest response.
Host can start rounds for newcomers only, reset sessions, or clear the leaderboard.
All gesture detection runs in your browser. Only your display name and reaction
results are shared with the room.