Reaction Time Test

Measures the gap between the screen turning green and your click, five times over, and reports the median. Browser and display latency are part of the number, so it is best used to compare runs on the same device.

How to use

  1. Press Start — after a random wait the screen turns green.
  2. Click, tap or hit space the instant it turns green.
  3. After five tries you get the median, your best, the spread and a grade.

Clicking before the signal voids that try and repeats it — that filters out anticipation from counting the rhythm.

The headline figure is the median rather than the mean: one lapse in five tries drags a mean a long way.

FAQ

What is an average reaction time?

Simple visual reaction is usually reported around 200–250 ms. On the web, browser event handling and display latency add tens of milliseconds, so a slightly slower figure here is normal.

Is a mouse faster than touch?

Usually yes — physical buttons on a mouse or keyboard beat a touchscreen. Compare grades between runs on the same input method.

Does a gaming monitor help?

Yes. A higher refresh rate and faster response mean the signal reaches your eye sooner. This number measures your device as well as you.

Related tools

  • Matrix Reasoning Test — Find the rule in a 3×3 grid and fill the empty cell. Items are generated fresh every run.
  • Aim Accuracy Test — Hit as many targets as you can in 30 seconds — hit count plus accuracy.
  • Flanker Interference Test — Answer only the middle arrow. Measures your attentional interference in milliseconds.
  • Memory Span Test — Repeat the order tiles flash in to measure spatial working memory (Corsi block task).