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Reaction Time Tester
Test your reaction speed with a color-change stimulus. See your percentile rank vs other gamers and share your best score.
Used 89K+ timesUpdated recently
Click to Start
Wait for the screen to turn GREEN, then click as fast as you can.
How it works
This engine processes live calculations client-side to output instant values. Inputs are stored locally in your browser storage so you do not lose your values. Share links dynamically append search queries to the URL so you can copy and send your exact configuration parameters to other players.
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