Reaction Time Test (Click When It Turns Green)
Wait for the red screen to turn green, then click, tap or press Space as fast as you can. After 5 rounds you get your average and best time in milliseconds, plus a rank. The wait is random every time, and reacting too early counts as a false start. To check your mouse itself, try the Mouse Tester.
🔒 Runs in your browser · Your data is never sent to a server
| Round | - |
| Last | - |
| Average | - |
| Best | - |
| Slowest | - |
| Median | - |
| False starts | - |
| Rating | - |
Round times
How to use
- Click the test area (or tap it, or press Space) to start.
- Wait while it is red. As soon as it turns green, click.
- After 5 rounds you see your average, best time and rating.
Notes
- The time shown runs from the screen change to the moment your input reaches the browser. It includes display lag (refresh rate, pixel response), input lag from your mouse, keyboard or touchscreen, and browser overhead, so it is not a pure measure of your nervous system.
- Results are best compared on the same device. Different hardware can shift the numbers by tens of milliseconds.
- Pressing before the screen turns green is a false start and that round is not recorded. The wait is random between 1.5 and 5 seconds.
- Ratings are rough guidelines: under 200 ms is excellent, under 250 ms is fast, under 300 ms is average. Fatigue, time of day and age also matter.
- If you are sensitive to flashing colors, be careful with the color changes.
Glossary
Reaction time
The delay between seeing a stimulus (the color change) and responding (the click). Typical visual reaction time is around 200–250 ms.
False start
Reacting before the signal appears. Here the round is discarded and you start it again.
Input lag
The delay between your action and the PC receiving it. It tends to be larger with wireless mice, touchscreens and low-refresh-rate monitors.
FAQ
What is an average reaction time?
Visual reaction time is typically around 200–250 ms. Experienced gamers sometimes reach the 150–200 ms range. A result under 100 ms is most likely a false start or a lucky guess.
Does the result include hardware lag?
Yes. Display lag, input lag from the mouse, keyboard or touchscreen, and browser processing time are all included, so the number is tens of milliseconds above your pure reaction time. It works best for comparing results on the same setup.
How are false starts detected?
If you press while the screen is still red, it counts as a false start and that round is discarded; click to retry. The wait is a random 1.5 to 5 seconds each time, so you cannot predict the moment.
Can I use a phone or the keyboard?
Yes. You can tap the test area or press Space. Touchscreens often add more input lag, so results may differ from those on a mouse or keyboard.
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