Wait for Green: a simple reaction time test
The classic reaction time test: wait for the screen to turn green, then tap as fast as you can.
Try a practice roundPlay today’s fiveHow it works
The panel stays red for a random wait, then turns green. Tap anywhere the instant it changes. Three rounds are averaged, and tapping before it turns green costs 300 ms.
What it measures
This is simple reaction time: one signal and one response, with no decision to make. It is the measure most people mean by "reaction time", and the one lab studies report most often.
Because the wait is random, you can’t time the change, only respond to it. Your result is the chain of your eye noticing the color, your brain deciding to move, and the signal reaching your hand, plus a little screen and touch delay.
What’s a good score?
In Reactdle, 300 ms or faster rates Sharp, up to 400 ms is Steady, and slower is Sluggish.
Tips
- Rest a finger just above the screen or key so the movement is tiny.
- Watch the whole panel rather than one spot; color changes are noticed fastest that way.
- Don’t guess. An early tap costs more than a slightly slow one.
About Reactdle
Wait for Green is one of twenty tests in Reactdle, a free daily reaction game. Every day everyone gets the same five tests, one from each kind: reflex, aim, brain, timing and words.