Reaction Time Tournament
LiveFive taps. One number in milliseconds. Play solo to chase your personal best, or pass the device around and crown the fastest finger in the room.
0 of 5 attempts completed in this round
No personal best saved yet — this run can set one.
How to play
- 1
Start the round
Tap or click the arena. It turns red and your round has begun — the green light can arrive any moment from here.
- 2
Wait for green
The change lands somewhere between 2 and 6 seconds. It is random on purpose, so you cannot guess it.
- 3
Hit it the instant it turns green
Tap the arena, click it, or press the space bar. Your time appears in milliseconds.
- 4
Do not jump the gun
Tapping while the arena is still red is a false start. In Solo you simply try that attempt again; in a Tournament you get two retries before a false start starts costing you attempts.
Works with a mouse, a touchscreen or a keyboard. Tap or click the arena, or press Space or Enter while it has focus. The arena never scrolls or selects text, and a stray double tap is ignored.
What is reaction time?
Reaction time is how long it takes you to respond to something you can see. We measure it in milliseconds — thousandths of a second — from the exact moment the arena turns green until the moment your tap lands, using your browser's high-resolution clock.
Most people land somewhere between 200 and 300 milliseconds on a screen. Around 250 ms is a solid average. Anything under 200 ms is quick; under 150 ms is rare and usually means the light was predicted rather than spotted.
Your device and browser add a little time of their own, and a slow phone will read slower than a fast laptop. Treat your score as a fun way to compare yourself with whoever is in the room on the same device — not as a scientific measurement, and not as a global ranking.
Playing with a group?
Switch to Tournament mode, add up to 10 names, and pass the device around. Everybody gets the same five attempts and the same handover screen, so nobody plays cold — then the standings rank everyone by their median. Your personal best is saved in this browser only, so it survives a refresh without anyone signing in.