Reaction Time Test
How fast are your reflexes, in milliseconds? Wait for the pad to turn green, then react as fast as you can — click or press the space bar. Five valid rounds give you an average that luck can't fake, plus your best round and the spread between them. Clicking early is caught as a false start and doesn't count.
No personal best yet — finish a run to set one.
You can also press Space when the pad is focused.
How to Play
- 1.Click the pad to arm the first round — it turns red while you wait.
- 2.The instant it turns green, click or press Space as fast as you can.
- 3.Click too soon and it's a false start — the round resets and doesn't count.
- 4.Complete five valid rounds to get your average, best, and spread.
- 5.Lower is better. Try again to shave milliseconds off your average.
Use this as a personal practice score
Results can vary with your device, browser, input method, and the specific round. They are useful for comparing your own runs under similar conditions, not for clinical, hiring, or diagnostic decisions. Read the methodology.
How to interpret a reaction-time result
This browser result includes screen update, visual detection, decision, hand movement, input device, and event timing. The site has no representative population reference, so it does not label a result normal or fast.
Treat any single number as a snapshot. Compare medians from several five-round runs on the same screen, browser, and input device.
- Average: the mean of five valid rounds
- Best: the quickest recorded valid round
- Spread: the difference between quickest and slowest valid rounds
- False starts: early clicks that do not count as valid rounds
How to improve your reaction time
Most of the easy gains come from removing what slows you down rather than chasing raw speed. Sit ready with your finger resting lightly, keep your eyes on the center of the screen instead of darting around, and avoid the urge to anticipate the green, which is what produces false starts.
Run all five valid rounds and watch the spread beside the average. A tighter spread means the recorded responses were more similar; the result alone cannot tell you whether a wider spread came from attention, anticipation, posture, or hardware timing.
- Rest your finger on the button so you are not moving from a cold start
- React to the color change, never to a rhythm you expect
- Reduce display and input lag where you can, then retest under the same setup
- Compare your best round and spread over time, not a single average
What do average, best, and spread mean here?
This test scores you on five valid rounds and reports a few things together so one lucky or unlucky click does not define you. Average reaction is your typical speed across the rounds, best round is your fastest clean response, and spread shows how much your rounds varied from each other.
Clicking before the screen turns green is caught as a false start and does not count as a valid round, which keeps anticipation from inflating your result. Reading all of these numbers as a set gives you a fairer picture than any single fast click ever could.
Frequently asked questions
What is the average reaction time in ms?
This site does not publish a population average for its browser test. Use the five-round average and compare several runs on the same hardware and input method.
What counts as a fast reaction time?
A lower repeatable average with no rise in false starts is faster on this task. The site does not assign a population label or percentile.
Why does the test catch false starts?
If you click before the screen turns green, that round is flagged as a false start and does not count toward your five valid rounds. This stops anticipation and guessing from making your average look faster than your true reaction.
How can I improve my reaction time?
Stay rested, keep your finger ready, watch the center of the screen, and respond to the color change instead of trying to predict it. Reducing display and input lag and comparing your scores over time under the same setup also helps you see real progress.
Why is my reaction time slower some days?
Browser load, hardware, posture, anticipation, interruptions, and ordinary run-to-run variation can change the result. Retest under similar conditions and do not infer fatigue, impairment, age, or health from one session.
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