Reaction Time Test
Test your reaction time online for free. Click the instant the box turns green, across 5 attempts, and see your reflex speed in milliseconds. No download, no sign-up.
How to Play
- Press Start, then wait for the red box to turn green.
- Click (or tap, or press Space) the instant it turns green.
- Click too early and you'll see "Too soon": that attempt restarts.
- Complete 5 attempts to see your best time, average, and full results.
Game Features
- 5-attempt rounds with a best time, average, and per-attempt breakdown.
- Random delay before each attempt, so you can't predict the timing.
- False-start detection: clicking early restarts that attempt instead of counting it.
- Personal best is saved on your device.
- Works with mouse click, touch tap, or the spacebar.
- No login, no download. Play instantly.
Tips & Strategy
- Keep your finger or cursor resting near the box instead of moving toward it after you see green.
- Focus on the box itself rather than looking away and glancing back.
- A few warm-up attempts before your "real" round tend to give a more consistent result.
Frequently Asked Questions
What is a good reaction time?
Most people's simple visual reaction time falls roughly in the 200 to 300 millisecond range. Times can vary by device, screen, and input method, so treat your result as a personal benchmark rather than an exact scientific measurement.
How is reaction time measured?
The test records the moment the box turns green and the moment you click, and reports the difference in milliseconds.
Why did I get "Too soon"?
"Too soon" means you clicked before the box turned green. That attempt doesn't count, and you'll get the same attempt again.
Can I actually improve my reaction time with practice?
Some improvement is possible with practice and focus, though reaction time is also influenced by factors like alertness and device response time.
Does this work on mobile?
Yes. You can tap the box on a touchscreen, or use a mouse click or the spacebar on desktop.
Is my best score saved?
Yes. Your personal best is saved on your device and will still be there the next time you play.