Test your visual reaction time. The average is ~250 ms; world-class athletes are around 170-200 ms. Get instant results, best-score tracking and 10-attempt history.
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How it works
After you click Start, we wait a random 1.5–5 second delay (to prevent anticipation) before turning the box green. The instant you click green, we compute the time delta.
Key features
- Randomized delay to prevent cheating by anticipation
- 10-attempt history
- Best & average scores
- "Too early" detection
Common use cases
Athletic testing
Track reaction improvements from training.
Gaming benchmarks
Compare with esports pros (170-200 ms is elite).
Cognitive assessment
Reaction time is a rough proxy for alertness and rest quality.
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Pro tips
- ◆Warm up with 3-5 practice runs — first attempt is always slower.
- ◆Test at the same time of day for meaningful comparisons.
- ◆Caffeine can reduce reaction time by about 20 ms.
Common mistakes to avoid
- ✕Clicking too early — you get a "tricked" screen and no score.
- ✕Comparing sub-100ms scores — those are almost certainly cheating.
Frequently asked questions
What's a good reaction time?▼
<250 ms is above average, <200 ms is excellent, <170 ms is elite.
What affects reaction time?▼
Sleep, caffeine, age, screen refresh rate, input device — all play a role.
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