Click the box, wait for green, then click as fast as you can.
How this reaction time test works
This test measures simple visual reaction time — the time it takes your brain to notice a change on screen and trigger a click. Click the box to begin. It will turn red for a random, unpredictable delay so you can't anticipate the exact moment. The instant it turns green, click as fast as you can. Your result appears in milliseconds, along with your personal best and your average over your last five attempts.
Average human reaction time to a visual stimulus is roughly 250ms. Reaction time naturally varies attempt to attempt, so try a few rounds to get a stable average rather than judging yourself on a single result.
Frequently asked questions
- What is a good reaction time?
- The average human reaction time to a visual stimulus is around 250 milliseconds. Anything under 200ms is considered excellent, while elite gamers and athletes often score between 150-200ms.
- How is reaction time measured on this test?
- After you click to start, the box turns red for a random delay of 1.5 to 4.5 seconds. The instant it turns green, a timer starts. Your reaction time is the number of milliseconds between the color change and your click.
- Why did I get 'Too soon'?
- You clicked before the box turned green. Reaction time tests only measure your response to the stimulus, so clicking early doesn't count and resets the round.
- Can I improve my reaction time?
- Reaction time is partly genetic, but practice, adequate sleep, caffeine, and reducing distractions can measurably reduce your reaction time by tens of milliseconds.