Click when the colour changes, over five attempts

Measure five visual click responses after independently randomized one-to-four-second waits.

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ToolReaction Time Test
0 / 5attempt
—best
—average

Wait for the box to turn green, then click as fast as you can. Five attempts, no keyboard shortcut, since clicking is the point.

How it works

Each round records performance.now when the target turns green and subtracts it from the click timestamp. Early clicks do not count, values below 100 ms are treated as anticipation, and accepted attempts report the minimum and rounded mean.

  • The randomized delay prevents a fixed rhythm from revealing the signal time.
  • Five attempts form a small casual session and do not establish a clinical or population benchmark.

Worked example

Five accepted attempts
Input
											284,301,267,290,278
Output
												Best: 267 ms
Average: 284 ms

When to use this

Users compare inputs on one device, classrooms demonstrate stimulus-versus-response delay, and casual practice observes trial variation.

Edge cases

  • Clicking before green cancels the wait and adds no zero or negative score.
  • A value below 100 ms is discarded as anticipation.
  • Display, mouse or touch hardware, event-loop load, refresh rate, and browser timer coarsening all contribute to the result.

References