Reaction Test

How to play Reaction Test

Reaction Test measures how quickly you respond to a visual cue. The panel turns red and holds for an unpredictable interval between one and five seconds, then flips to green. Your time is measured from that flip to your input.

Going early does not just void the round — it adds a penalty to your average, which is what stops people from tapping blind. Five rounds make a run, and the run score is the average of the five with the best and worst both shown.

Objective

React to the green flash as fast as you can across five rounds, without clicking early.

Features

• Randomised one to five second hold before every cue
• Early-click penalty applied to the run average
• Five-round runs with best, worst and average shown
• Millisecond-accurate timing from the frame the cue appears
• Best average reaction time saved locally

Scores are saved in this browser only. There is no global ranking and nothing is uploaded.