Reaction Time Test
Wait for green, then click as fast as you can — five rounds, then your average.
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About this tool
The box waits a random delay (between about 1.5 and 5 seconds) before turning green and saying "Click now!" — the instant it does, click it; your reaction time is measured in milliseconds from that exact moment. Clicking before it turns green counts as "too soon" and that round restarts without counting towards your score. Each session runs 5 rounds, and your average time across those rounds is shown at the end. Your personal best single-round time is saved in this browser's local storage only — nothing is sent anywhere.