What it measures
From the moment green appears to the moment your finger taps the screen. In between: your eyes detect the color change, nerves send that information to the brain, the brain commands your finger, and the muscle moves. That's what we commonly call "reflexes."
Where's the average?
In lab settings, simple visual reaction time for adults is typically around 250ms. But browser-based tests add monitor draw time and click processing latency, so expect 270–300ms in practice. 300ms doesn't mean you're slow.
| Range | Approximate position |
|---|---|
| ~200ms | Top 5% |
| 200–250ms | Top 20% |
| 250–300ms | Top 40–60% |
| 300–350ms | Average |
| 350ms~ | Room to improve |
What affects your score
Sleep
Lack of sleep noticeably slows reaction. Some studies compare an all-nighter to mild intoxication. Morning vs. sleepy afternoon scores can differ significantly.
Arousal
Being moderately alert is when you're fastest. If your score improves after a coffee, it might not be coincidence. But too tense and you'll tap before green even appears.
Age
Peaks in the early 20s and gradually slows. Though regular practitioners maintain good numbers regardless of age.
Device
The same person often scores better with a mouse than touch, and on high-refresh-rate monitors. Compare on the same device for fairness.
How to get faster
Innate nerve speed has limits, but practical values improve with training. Sleep well, warm up lightly, repeat a few times a day. Anticipating green — keeping tension in your fingertips — lowers your average. But anticipate too much and you'll get flagged for premature taps. Balance is key.
FAQ
Why 5 rounds instead of 1?
A single round is dominated by luck. One distraction and you get a bad score regardless of skill. Averaging multiple rounds gets much closer to your true reaction time.
I tapped before green — why redo it?
Tapping before the color changes is prediction, not reaction. If we allowed it, whoever taps recklessly fastest would win. So that round is redone.
Where are scores stored?
Only in this browser's localStorage. Nothing goes to a server, nothing is shared with others. Clear your browser data and it's gone.
How is the percentile calculated?
It's a rough estimate based on distributions observed across various online reaction time tests. Not precise statistics — for reference only.
Try other domains: Memory Span, Arithmetic Speed, Aim Trainer.