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About this tool
Measure your reaction time in milliseconds with a simple click test. Track attempts, see your stats, and compare your score.
Reaction Time Test measures how fast you respond when the screen turns green — a simple reflex challenge with your best time and average tracked.
Open Reaction Time Test on AltFTool — it loads instantly in your browser.
Add your input to the workspace.
Adjust the options until the result looks right.
Copy or download the output and put it to work.
Get your time in milliseconds.
Track improvement over attempts.
Wait for green, then click.
From when the screen turns green to your click, in milliseconds.
Under 250ms is excellent; under 200ms is superhuman.
Yes — clicking before green ends the round as 'too early'.