How to use
- Click the box to start and wait while it is red.
- Click or press Space the moment it turns green; clicking too early restarts the attempt.
- After five attempts, read your average, best time and rating.
Options explained
- Reaction time
- Milliseconds from the change to green until you press. Timing stops on press, not release.
- Ratings
- Over 400 ms slow, 300–400 average, 250–300 good, 200–250 fast, under 200 exceptional.
Reaction time ratings
| Average | Rating |
|---|---|
| Under 200 ms | Exceptional |
| 200–250 ms | Fast |
| 250–300 ms | Good |
| 300–400 ms | Average |
| Over 400 ms | Slow |
Frequently asked questions
What is a normal reaction time?
Simple visual reaction times are usually between 200 and 300 ms, averaging about 250 ms.
Why do my times vary?
Attention, tiredness, your mouse or touchscreen and display lag all play a part. Averaging several attempts evens this out.
Can I compare phone and computer results?
Touchscreens and monitors add different delays, so compare results on the same device.
Privacy
This tool runs entirely in your browser. Your files and text are processed on your device and are never uploaded to our servers.