Reaction Time Test
Measure your reaction time in milliseconds: click as soon as the screen turns green.
Your data is never sent to any server.
The reaction time test measures your visual reaction in milliseconds: wait for the screen to turn from red to green and click as fast as you can. The tool records your last time, best score and average so you can track progress.
Watch the average, not the best attempt
Anyone gets a single very fast attempt now and then, sometimes because they anticipated and got lucky. The average of several attempts says far more about your real reflexes, and it is the figure worth comparing with other people or with yourself at another time of day.
It makes a good experiment: measure your average right after waking up, after a coffee and late at night. Tiredness usually shows more than anything else.
How to use Reaction Test
- 1
Click to start
Press the play area to begin the attempt. The screen turns red, your signal to wait.
- 2
Wait for green
After a random delay, the screen turns green. The delay varies on each attempt so you can't anticipate it.
- 3
Click as fast as possible
The moment you see green, click. Your reaction time is measured in milliseconds from the color change to your click.
- 4
Compare your scores
The tool keeps your last 20 attempts in the browser and shows your latest time, your best and your average. If you click before green, the attempt is voided.
Frequently asked questions
What's a good reaction time?
The human average to a visual stimulus is between 200 and 270 milliseconds. Under 200ms is excellent, and elite athletes and gamers are around 150–180ms.
Why is the delay before green random?
If it were fixed, you'd learn to anticipate it and the test would measure prediction instead of reaction. A random delay ensures you respond to the real stimulus.
What happens if I click too soon?
The attempt is voided and you'll see a "too soon" warning. Click again to start another; voided attempts don't affect your stats.
Does my hardware affect the result?
Yes, quite a lot. Between the mouse, the system and the screen, 20 to 50 milliseconds add up easily: a 60 Hz screen only refreshes every 17 ms, and a cheap wireless mouse adds a little more. To compare scores with someone else, use the same setup.
How can I improve my reaction time?
Resting well, practicing regularly and staying focused all help. Caffeine marginally improves reaction; fatigue and distractions hurt it a lot.