Games /
Reaction Time
Test how quickly you can respond to a visual signal. Wait for the area to turn green, then click or tap as fast as you can. Clicking before it turns green counts as a false start. Average human reaction time is 200–300 ms; trained athletes can achieve under 150 ms. Your last five attempts and personal best are saved locally.
Last
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Best
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Avg (5)
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Last 5 attempts
How to play
- Click the dark area to start. It will turn red and show a "Wait…" message — don't click yet.
- After a random delay (1–4 seconds) the area turns green and shows "Go!" — click or tap it immediately.
- Your reaction time is shown in milliseconds. Clicking before it turns green counts as a false start and resets the attempt.
Frequently asked questions
- Is it free?
- Yes, completely free with no signup or ads.
- Does my data leave my device?
- No. Your reaction history and best time are stored only in your browser's localStorage.
- Does it work on mobile?
- Yes. Tap the area on iOS Safari or Android Chrome — touch input is fully supported.