Guide
How Online Reaction Tests Work and What They Actually Measure
Reaction tests look simple, but their value comes from timing discipline and repeatable conditions.
Reaction tests measure response after a cue
The task is not to guess. The useful result appears when you wait for a real visual change and click only after it happens.
One result is not a verdict
Network conditions do not usually matter for an in-browser test, but browser focus, device latency and your own concentration can shift the number. Use several rounds.
Look for consistency
Instead of chasing one impossible best, check whether your average and your slowest attempts are improving. That is often a better sign of training effect.