The reaction speed test measures exactly how fast you react in milliseconds. Five rounds, instant results, plus a performance score out of 1000 and your percentile.
Click, tap, or press Space when the panel turns green.
We combine your average reaction, consistency and false starts into a single performance score out of 1000, with tiers from Beginner to Elite.
Warm up, remove distractions, and practice in short sessions. Consistency matters as much as raw speed.
They're the same idea — how quickly you respond to a signal, measured in milliseconds.
A 0–1000 score blending speed, consistency and accuracy. It's a ReactionLab benchmark, not a medical rating.
Yes — create a challenge link and see who reacts fastest.
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.