Speed & Reflex

Reaction Time Test

This test measures how quickly you react to a simple visual signal — the same kind of measurement used in basic cognitive and driving-reflex research, simplified into a quick browser game. You'll see a box that starts dark blue; the instant it turns teal, click it as fast as you can. You'll run five rounds, and we'll throw out any round where you clicked too early, since that measures impatience rather than reaction speed. Your final score is the average of your five valid rounds, shown in milliseconds (ms) — a thousandth of a second. For context, a blink takes about 300-400ms, so most people land somewhere close to the speed of their own blink.