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Reaction Rush: reaction speed training in the browser
Reaction Rush measures simple visual reaction time. After a randomised delay, the stage turns green and a timestamp is taken. Your click, tap or keypress is timed against that signal and reported in milliseconds.
The delay range changes with difficulty, which reduces anticipation without changing the measurement itself. Five valid rounds produce a best and an average. False starts are counted, restart the current round, and lower accuracy — they never produce a fake fast time.
Inputs are locked the instant a valid measurement registers, so a double tap cannot record two results. If the tab is hidden during the wait or the green signal, the round is paused and restarted instead of scoring an invisible reaction.
How to play
- Start the test and wait. The stage stays amber while the signal is arming.
- Tap the stage — or press Space or Enter — the moment it turns green.
- Tap early and the round restarts with a false start recorded; no time is saved.
- Five valid rounds are measured. Your fastest time becomes your personal best.
Tips
- Rest your finger lightly and focus on the centre of the stage.
- Do not try to predict the delay; anticipation causes false starts.
- Take a breath between rounds. Relaxed hands react faster than tense ones.
Reaction Rush FAQ
What is a good reaction time?
For a simple visual signal, roughly 200–250 ms is excellent, 250–320 ms is good, and 320–450 ms is steady. Results vary with device, input method and fatigue.
Why did my round restart?
An early tap is a false start. The round restarts with a new delay and the false start is counted against accuracy. This prevents lucky guess timing from being recorded as a reaction.
Why five rounds?
A single measurement is noisy. Five valid rounds give a best and an average, which is a fairer picture of your reaction speed.