Tap anywhere to start · tap the instant it turns green · early taps count as a foul · Space works on desktop
Tap to start: after a random wait (1.5–4 s) the screen suddenly turns green — tap immediately. Tapping before green is a foul. Each round shows your reaction time in ms and a rating.
Between tasks, while waiting for a meeting, or whenever you want to test your reflexes. A round takes seconds.
An online reaction time test for your visual reflexes: tap when green, foul if early. Runs entirely in your browser; scores stay on your device.