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Reaction time test — measured in milliseconds

Wait for the panel to turn green, then tap as fast as you can. The time from the change to your tap is measured in milliseconds over five rounds, and tapping too early repeats the round.

Tap to start

Tap as fast as you can the moment the panel turns green. You get five rounds.

You can also press Space or Enter.

    Result

    Your result appears here when you finish.

    About this tool

    How to use it

    1. 1 Tap the grey panel or press Space to begin.
    2. 2 Wait while it is red, then tap the instant it turns green.
    3. 3 After five rounds, check your average and fastest time and share the result card.

    Good to know

    • Japanese and Chinese are measured in confirmed characters, not keystrokes
    • Best scores are kept only in this browser on this device — clearing site data removes them

    Frequently asked questions

    What happens if I tap too early?

    You'll see "Too soon" and the round won't count. The wait is random between 1.5 and 5 seconds each time, so you can't time it by rhythm.

    Is mouse or touch faster?

    It depends on the device. Display refresh rate, wireless mice and how a touchscreen processes input can shift the same person's time by tens of milliseconds. Compare scores on the same device.

    Can I use the keyboard?

    Yes. Focus the panel with Tab or a single tap, then press Space or Enter. Holding a key down counts only once.

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