How to use
- 1Choose visual mode (wait for green) or audio mode (wait for the beep).
- 2Click to start and wait — the signal comes after a random delay.
- 3Click (or press Space/Enter) as soon as the signal appears; clicking too early is a false start.
- 4After five rounds, read your average, best time and rating.
How the reaction time test works
After you start a round, the screen waits for a random 1.5 to 4.5 seconds before turning green (or playing a beep in audio mode), so you can’t anticipate it. The time from the signal to your click is your reaction time in milliseconds. Clicking before the signal counts as a false start and the round is repeated. Five rounds are averaged, because single attempts vary a lot.
What is a good reaction time?
Most people average 200–300 ms on a visual test like this one. The rating marks under 180 ms as exceptional, 180–220 ms as very good, 220–260 ms as above average, 260–320 ms as average and slower times as below average. Reaction to sound is typically a little faster than to light. Fatigue, caffeine, age and practice all affect the result, and so does your hardware: mouse, display refresh rate and input lag add delay.
Audio mode and device latency
In audio mode you click when you hear the beep. Speakers and especially Bluetooth headphones add latency — sometimes tens of milliseconds — so wired headphones or built-in speakers give fairer results. Your all-time best average is stored separately for each mode in your browser only.
Frequently asked questions
What is the average human reaction time?
For a simple visual test, most people average about 200–300 milliseconds.
Why is my reaction time slower on some devices?
Input and display latency add up: a 60 Hz screen, wireless mouse, touch screen or Bluetooth audio can each add several milliseconds or more.
What counts as a false start?
Clicking before the screen turns green (or before the beep). The false start is counted and you try that round again.
Can I use the keyboard?
Yes. Press Space or Enter instead of clicking.
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