Reaction Test Lite

Reaction Test Lite measures your visual reaction time. The pad turns red while you wait, then flips green after a random delay — tap the instant it changes. Five valid rounds are averaged into one honest number with a human-scale rating.

Tapping early is a false start: it never counts, the round simply re-arms, and the random delay means the rhythm cannot be anticipated. Timing starts on touch-down, not release, and uses a monotonic clock, so the number you get is the number you earned. Your best time is saved and new records are called out.

Around 250 ms is a typical adult average on a phone; screens add their own latency, so compare against your own best rather than other devices. This is a game, not a medical assessment.

Reaction Test Lite works offline, has no account and saves only your best time, on your phone.