Test your reaction speed in milliseconds, see how you rank, and challenge your friends.
Free • No download • Desktop & mobile
Click, tap, or press Space when the panel turns green.
5-round test • Instant results • Personal statistics
Different tests for different kinds of speed.
Beat a score, generate a unique challenge link, and see if your friends can react faster. Head-to-head, winner takes the bragging rights.
Personal dashboard with progress charts, records, streaks and your reaction score out of 1000.
Honest, careful guides on what reaction time is, what affects it, and how to actually get faster.
On a browser-based visual test, many people land between 200–300 ms. Under 200 ms is very fast. Your result depends on hardware, input device, and focus — so treat it as a personal benchmark, not a fixed number.
Reaction time naturally fluctuates with attention, fatigue, screen refresh rate and input latency. That's why we run five rounds and report the median as well as the average.
No. ReactionLab measures performance on this specific browser task only. It is not a medical, neurological, intelligence, or athletic assessment.
Yes. The core reaction test is completely free, no download and no account required to start.