A free, fast, five-round reaction time test. Click, tap, or press Space the instant the panel turns green and see your reaction speed in milliseconds — plus your average, median, consistency and percentile.
Click, tap, or press Space when the panel turns green.
You go through five rounds. Each round waits a random amount of time, then turns green. React as fast as you can. Reacting before the green signal is a false start and doesn't count. We report your average, median, best and consistency so one fluke doesn't skew the result.
Most people land between 200–300 ms on a browser test. Under 200 ms is very fast. Because your monitor, input device and browser add latency, the most useful comparison is against your own past results over time.
On a browser-based visual test, 200–300 ms is typical and under 200 ms is very fast. 'Good' is personal — track your own trend rather than a single number.
Yes. The core reaction time test is completely free with no download and no account required to start.
Attention, fatigue, screen refresh rate and input latency all shift your result. That's why we run five rounds and report the median as well as the average.
ReactionLab is a browser-based reaction performance test. It is not a medical, neurological, or intelligence assessment. Results depend on your hardware, input device, and browser. See our methodology.