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Reaction Time Test

Click the moment the screen turns green. It takes five readings, gives you the average and your best in milliseconds, and shows where you land against typical human reaction time.

🎮 Your best scores stay on this device. No sign-up, nothing uploaded.

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This round

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Average (0)

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Fastest

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Best

About human reaction time

Reacting to light usually takes 200–250ms. That is the eye receiving the signal, the brain deciding, and the command reaching your finger — which is why practice rarely gets anyone below 100ms. Your screen refresh rate and mouse latency add another 20–30ms on top.

What this game does

  • Average and best over five rounds
  • Clicking too early is voided
  • Compared against the human average
  • Try again for a better record

Other games

Click Speed TestHow many clicks can you get in 10 secondsAim TrainerHow many targets can you hit in 30 secondsTyping Speed TestType sentences to measure WPM and accuracySequence Memory GameRepeat the order the colours light up in

These are for fun, not diagnostic tests. Scores shift with your screen, mouse and how tired you are.