Reaction Speed Test

Test your reaction speed by clicking when the screen turns green

Click as fast as you can when the screen changes from red to green

Average human reaction time: 200-300ms

How to Use

Measures how long it takes you to click or tap after the screen turns from red to green, in milliseconds. The wait before green is random, anywhere from 2 to 7 seconds, so you can't time it.

Press 'Start Test'. The box turns red and says 'Wait for green...'.

When it turns green and says 'Click now!', click or tap it as fast as you can. On a computer, Space or Enter works too.

Your time appears in ms, and 'Best Time', 'Average of last 5' and 'Attempts' update. 'Try Again' starts the next round straight away.

Clicking while it's still red shows 'Too early! Try again', and that round isn't recorded.

Pro Tips

Watch 'Average of last 5' rather than a single try. One round is mostly luck.
The time is taken the moment you press down, so how quickly you let go doesn't matter.
Touchscreens usually score slower than a mouse. Compare with friends on the same device.
To test your sense of time rather than your reflexes, try the Timer Challenge.

Use Cases

Common reasons to test your reaction time:

Warming up before a game

Check your reflexes before FPS or rhythm games.

Example: If you're well above your usual time, it's a fair sign you're tired.

Contests with friends and family

Settle who's quickest.

Example: Take turns on the same device, five attempts each, and compare best times.

Seeing how tiredness affects you

Compare your numbers at different times of day.

Example: Test once in the morning and once late at night. It's a curiosity, not a medical test.

Frequently Asked Questions

Is 300 ms slow?

No. On browser tests like this most people land between 200 and 300 ms, and your monitor, mouse and browser can add tens of milliseconds. Staying under 200 ms consistently is quick.

It keeps saying 'Too early!'

You clicked while the box was still red. The wait changes every time (2–7 seconds), so react to the color change instead of guessing when it will come.

Does it show an average?

Yes. 'Average of last 5' shows the mean of your five most recent rounds, or of every round so far if you've done fewer.

Are my results saved?

Your best time is saved in this browser and is still there next visit. The average and attempt list clear on refresh, and 'Reset Stats' clears the best time too.