Wait for green, then tap
The pad starts red. After a wait of one and a half to four and a half seconds, chosen at random so you cannot guess it, it turns green. Tap it as fast as you can and the page shows how many milliseconds passed between the colour change and your tap.
If you tap while it is still red, the try is cancelled and the pad says it was too soon. Your best time and the average of your last five tries are kept on your device, so you can see whether you improve.
How to play
One pad and your finger.
Press Start. The pad turns red; wait without tapping.
When the pad turns green, tap it as fast as you can, with a finger or the space bar.
Read your time in milliseconds, then press Try again to beat your best.
What the test does
Just the reaction, measured simply.
- A random wait of 1.5 to 4.5 seconds before the pad turns green
- Your time in milliseconds, with a word for how quick it was
- Your best time and the average of your last five tries
- Works with a tap, a click or the space bar and Enter keys
Where it is useful
Anywhere a quick contest helps.
A friendly duel on one phone: take turns and compare times.
A warm-up before a quiz or a game.
A break between lessons, to see who has the fastest reflexes.
How the result is read
Under 200 ms counts as lightning fast, under 250 ms as quick, under 350 ms as average and anything slower as take your time. Most people react in about 200 to 300 ms.
The measured time includes the delay of your screen and your device, so compare results on the same device rather than across different ones.
Good to know
This is a game, not a medical or driving test, and it cannot tell you anything about your health. Results change with your device, your screen and how tired you are.
Nothing is sent anywhere: your best time and average stay in this browser.
Tips
- Rest your finger above the pad, not on it, so you do not tap by accident.
- Take several tries and look at the average instead of a single lucky result.
Reaction test questions
What is a good reaction time?
Under about 250 milliseconds is quick, and most people land between 200 and 300.
Why does the test say too soon?
You tapped while the pad was still red. Wait for green and try again.
Is my best time saved?
Yes, on your device only, until you press Reset.