Wait for green, then tap as fast as you can. Do five rounds to get a fair average.
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How it works
- Tap the box to start. It turns red.
- After a random wait it turns green. Tap as soon as you see it.
- Tap too early and the round doesn’t count.
Your best time is remembered on this device so you can try to beat it.
What affects your score
- Your device: screens, mice and touchscreens add 10 to 50 ms of delay, so compare results on the same device.
- Tiredness, alcohol and some medicines slow your reactions, which is one reason they’re dangerous when driving.
- Practice and focus: scores usually improve over the first few rounds.
Frequently asked questions
What is a good reaction time?
On a screen test, many people average 200 to 300 ms. Under 200 ms is very quick.
Why is my time slower on my phone?
Touchscreens and display refresh add delay.
Does it work with a keyboard?
Yes, focus the box and press the space bar.
Is anything stored?
Only your best time, on this device.
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