Reaction time test
Measure how fast your reflexes are: wait for the screen to turn green, then click as quickly as you can. Your time is measured in milliseconds, with best and average across attempts. Everything runs locally in your browser.
- Attempts
- 0
- Best
- —
- Average
- —
- Median
- —
100% local — nothing leaves your device
How to use it
- 1 Click “Start”, then wait — the screen stays red until it turns green.
- 2 Click (or tap) the instant it turns green to record your time in milliseconds.
- 3 Repeat a few times; the tool tracks your best and average score.
- 4 Press “Share” or note your result to compare it later or against others.
Troubleshooting
Reaction time test not working in Chrome or on Windows 11
Make sure JavaScript is enabled and any aggressive ad blocker or “reader” mode is off, then reload the page. The test uses only standard browser timing, so it works in current Chrome, Edge and Firefox on Windows 11 without any plugin, extension or permission prompt.
My reaction times look too slow or inconsistent
Slow scores usually come from your setup, not your reflexes. Close heavy background tabs and apps, plug in a laptop to disable power saving, and use a wired mouse if you can. A high-refresh-rate monitor (120Hz+) and low display lag also shave several milliseconds off every result.
It registers a click before the screen turns green
Clicking while the screen is still red counts as a false start, so the timer ignores it or shows a warning and restarts the round. Wait until the colour actually changes to green before clicking. The delay before green is randomised on purpose so you can't anticipate it.
Reaction time test not working on mobile or touchscreen
On phones and tablets, tap anywhere on the test area instead of clicking. If taps feel laggy, close other apps, disable battery-saver mode, and avoid testing over a slow connection while the page is still loading. Touchscreens add a little input latency, so times often run slightly higher than with a mouse.
Frequently asked questions
What is a good human reaction time?
For a simple visual stimulus, typical human reaction time is around 200–250 milliseconds. Trained gamers and athletes often reach 150–200 ms, while most people fall a bit above 250 ms depending on age, focus and their hardware.
Is anything uploaded or recorded?
No. The test runs entirely in your browser and only measures the time between the green signal and your click. Nothing is recorded, and no result is sent to a server unless you choose to share it.
How does it measure my reaction time?
It records a timestamp the moment the screen turns green and another when you click, then reports the difference in milliseconds. It uses your browser's high-resolution timer for accuracy, though your display and input device add a small fixed delay.
Why are my results different on another device or browser?
Reaction time results depend heavily on hardware. Monitor refresh rate, display lag, mouse versus touchscreen, and even browser performance all shift your measured time, so the same person can score differently across devices.
Does it work on mobile and which browsers are supported?
Yes. It works in any modern browser — Chrome, Edge, Firefox, Safari and Opera — on both desktop and mobile, with no install or permission needed. On touchscreens you tap instead of click.
How can I improve my reaction time?
Stay focused, rest your finger lightly ready to click, and take several attempts to find your true average. Good sleep, a high-refresh-rate screen and a responsive mouse help more than anything, since much of your score is hardware latency.