Reaction Time Test
Click as soon as the box turns green to measure your reaction time.
How fast are your reflexes?
This reaction time test measures how quickly you respond to a visual signal. Click the box to start, wait for it to turn green, then click again as fast as you can. The tool times the gap between the colour change and your click using your browser's high-resolution clock, then shows the result in milliseconds along with a rating. Take several turns and the test keeps a running average so you can see your true reflex speed rather than a single lucky tap.
The green signal appears after a random delay of one to four seconds, so you cannot anticipate it. If you click before the box turns green, the test tells you that you jumped early and resets that round — only genuine reactions are timed. Everything runs locally in your browser, so there is no network lag added to your score and nothing is uploaded.
For most healthy adults, visual reaction time falls between 200 and 300 milliseconds. Faster than 200 ms is exceptional; times above 400 ms usually mean you were distracted, tired, or on a slow display. Bear in mind that your screen, mouse, and how recently you blinked all add a few milliseconds, so treat the number as a fun benchmark rather than a clinical measurement.
FAQ
What is a good reaction time? Around 200–250 ms is great for a human responding to a visual cue. The average adult lands near 250–300 ms, and anything under 200 ms is excellent.
Why did it say I clicked too soon? You clicked while the box was still red, before the green signal appeared. The test resets that round so only true reactions are measured — wait for green.
Does my equipment affect the result? Yes. Display refresh rate, mouse or touchpad latency, and even the browser add a few milliseconds. Use the same setup each time for a fair comparison.
How is the average calculated? It is the rounded mean of every valid attempt in your current session. Clicking Restart clears the history and starts a fresh average.