Reaction Time Test
How fast are you?
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About Reaction Time Test
The Reaction Time Test measures how fast you respond to a visual cue. Click to start, wait for the box to turn green after a random 1 to 4 second delay, then click as quickly as you can. It runs five rounds, records each result in milliseconds, flags clicks that jump the gun, and shows your best and average at the end.
It is completely free with no sign-up, no ads, and no limits. Everything runs entirely in your browser using your device's high-resolution timer, so your results are calculated locally and never uploaded or stored anywhere.
Frequently asked questions
- Is the reaction time test free to use?
- Yes, it is 100% free with no account, sign-up, or download required. You can run as many tests as you like as often as you want.
- Is my data uploaded or stored anywhere?
- No. The entire test runs inside your browser and your reaction times are calculated locally on your device. Nothing is sent to a server, uploaded, or saved, and results clear as soon as you restart or close the page.
- What is a good reaction time?
- For clicking on a visual cue, the average adult reaction time is roughly 250 to 300 milliseconds. Under 200 ms is quite fast, while values above 350 ms are on the slower side. Fatigue, screen refresh rate, and mouse or trackpad lag all affect your score.
- Why does it say 'Too soon — try again'?
- That message appears when you click before the box turns green. The go signal is delayed by a random amount between 1 and 4 seconds to stop you from anticipating it, so an early click doesn't count and that round simply restarts.
- How is the reaction time measured?
- The timer starts the instant the box turns green and stops the moment you click, using the browser's high-resolution performance timer for millisecond accuracy. The test runs five rounds and reports each time plus the average.
- Can I take the test using the keyboard?
- Yes. Focus the test area and press the Space bar or Enter key instead of clicking. This works for starting a round, reacting to the green cue, and retrying after an early press.