Reaction Time Test
Measure how fast you react to a visual signal over 5 rounds.
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Personal bestNone yet
The panel changes color once per round. Nothing flashes or blinks.
How to use
Click, tap or press Space on the panel to begin. The panel turns dark and waits for a random moment between 1.5 and 5 seconds.
When the panel lights up, react as fast as you can with a click, a tap or the Space bar. Pressing before the change counts as too soon, and that round starts over.
After 5 rounds you see your average, your fastest and slowest round, and where each attempt landed on a strip. Your best average is kept in this browser so you can try to beat it.
To compare scores fairly, use the same device and input each time. Screens, mice, keyboards and touch screens each add their own delay.
FAQ
What is a normal reaction time?
Simple visual reaction time in healthy adults is commonly cited at roughly 200 to 300 ms. Online tests usually read a little higher because the screen and input device add delay. Age, sleep, attention and practice all shift the number, so your own average over several sessions is the most useful reference.
Why is my score different on a phone and a PC?
Phones and computers handle input differently. A touch screen scans for touches at a fixed rate, and the browser passes touch input through a longer path than a mouse click, so the delay before your press is registered is often different. Compare scores on the same device and input method.
Does monitor refresh rate matter?
Yes. A 60 Hz display shows a new frame every 16.7 ms, so the change can reach the screen up to one frame after it is triggered. At 144 Hz a frame lasts about 6.9 ms. Mouse polling, keyboard scanning and display processing add small delays as well, and no browser test can remove them.
How is the time measured?
The test uses performance.now() to record when the panel change is committed for display and when your input event was created. It reacts to the moment you press down, not to a full click, so releasing the button is not counted. A press before the change is not recorded, and that round starts over.
Is my result uploaded anywhere?
No. The test runs entirely in your browser. Your personal best is saved in this browser's local storage and is removed when you clear the site's data.