How fast are your reflexes? Wait for the panel to turn green, then click as fast as you can. Do it five times for your average and best. No sign-up — everything runs and saves right here in your browser.
Round 1 of 5 · Keyboard: press Space or Enter to click the panel.
Complete all 5 rounds to lock in a session average. Your best round is added to the leaderboard below.
Your top 10 fastest single reactions, saved locally on this device. Nothing is uploaded.