Reaction Test
In Reaction Test you tap the moment the colour changes and see your reaction time in milliseconds. Five rounds, averaged. Free, no install, no sign-up.
In Reaction Test you wait for the screen to change colour, then tap as fast as you can. Five rounds, and the result that matters is the average rather than your luckiest single tap.
about 14.0 KB
Works offline after the first visit. No install, no sign-up.
Loading the game…
How to play Reaction Test
What you are measuring
The gap in milliseconds between the screen signalling and your tap. Five rounds are played and the average is reported alongside your fastest single round.
Why the wait is random
The signal arrives after a delay chosen at random between 0.9 and 2.6 seconds. If the delay were fixed you would learn to count it off, and you would end up measuring your counting rather than your reaction.
Tapping too early does not count
A tap before the signal is a false start: that round is discarded, it is not counted towards the five, and the delay is re-rolled. Guessing is therefore never worth it.
No countdown is shown on purpose
While you are waiting, the screen shows nothing but a neutral placeholder. Displaying a ticking clock would turn a reaction test into a prediction test.
Use the average, not one number
A single reading is heavily affected by your device, how warm your hands are and how you are holding it. The average of five is the number worth comparing between attempts.
Reaction Test Tips and Strategy
Watch the whole screen, not one spot
The panel turns green and the word TAP appears, so anything you were looking at is no longer the thing that matters. Fix your eyes on the middle of the play area rather than on the spot where you expect the change. Beginners who stare at one corner add their own searching time to every single round.
False starts cost nothing but time
Tapping during the wait does not record a bad number, it discards that round and rolls a fresh delay. Since the delay is drawn randomly between 0.9 and 2.6 seconds there is no rhythm to learn, so counting beats is wasted effort. Stay loose and let an early tap go: it costs a few seconds, not the average.
Judge the average, not the best
Five rounds are played and the average is what the game reports at the end, with the fastest single round shown only for reference. One quick round surrounded by four slow ones is noise, not improvement. Compare one full set of five against the next, and change something small rather than trying harder on the same attempt.
Reaction Test — Frequently Asked Questions
Why was my result thrown away?
You tapped before the signal. False starts are discarded rather than recorded, so the five rounds you are scored on are all genuine reactions.
What is a normal result?
It varies hugely by device and input method, so the honest answer is that the useful comparison is your own average against your own earlier average, not against a published figure.
Do I need five rounds?
Yes, the round ends when five genuine reactions have been recorded. The average is reported at the end.
Does it need installing or an account?
No. It runs in the browser on a phone, tablet or computer and works offline after the first visit.