How quickly can you react? Wait for the red box to turn green, then tap or press Space as fast as you can. After five rounds you get your average, median and fastest time in milliseconds, with a simple rating. It is a fun challenge for friends, and a handy way to notice when you are tired.
loading toolHow to test your reaction time
- Tap the box (or press Space) to start.
- Wait while it is red. Do not tap yet.
- The moment it turns green, tap as fast as you can.
- Repeat for five rounds to see your average and best.
Good to know
- Use a computer mouse or keyboard for the most accurate timing; phones add a little delay.
- Your best time and last ten averages are saved on this device.
Questions
What is a normal reaction time?
For a simple “see it, tap it” test most adults score between about 200 and 300 milliseconds. Under 200 ms is very quick. Screens and touch panels add a few milliseconds of their own.
Why does my time change so much?
Attention, tiredness, caffeine, the device and even how you hold it all play a part. That is why the test averages five rounds and also shows the median, which ignores one odd result.
What if I tap too early?
The box turns orange and says “Too soon!”. The round does not count; tap to try it again. The wait before green is random (1.5 to 5 seconds), so you cannot guess the timing.
Can this test tell if I am fit to drive?
No. It is a game, not a medical or safety test. Never drive if you feel tired or unwell, whatever your score.
Is my data private?
Yes. Everything happens inside your own browser: nothing you type or choose is uploaded to us or anyone else.
Is it free?
Completely free, with no sign-up, no watermark and no limit on how many times you use it. Light ads keep the site running.
