About the Reaction Time Test
This reaction time test measures simple visual reaction time: how long it takes from seeing the colour change to moving your finger. A single try depends a lot on luck, so the test runs 5 rounds and averages them. Your best results and last 10 runs are saved only on this device, so you can compare next time.
How to use
- Tap the blue area and the screen turns red. Don't tap yet โ wait.
- At a random moment between 1.5 and 4.5 seconds it turns green. Tap as fast as you can.
- Your time is shown in ms. Tap again for the next round.
- After 5 rounds you get your average, a grade and a rough percentile. Tapping on red is a false start and only that round is repeated.
Reaction time grades
| 5-round average | Grade |
|---|---|
| Under 180 ms | Pro gamer |
| 180โ219 ms | Lightning reflexes |
| 220โ259 ms | Very fast |
| 260โ299 ms | Fast |
| 300โ349 ms | Average |
| 350โ419 ms | A bit slow |
| 420 ms or more | Sleepy? |
The percentile is a rough estimate assuming browser-measured reaction times follow a normal distribution with a mean of about 280 ms and a standard deviation of about 60 ms. It's for fun, not an official statistic.
What affects your score
- Device lag: screen refresh (a 60 Hz display adds up to about 17 ms), wireless mice and touchscreen latency all add time. Compare results on the same device.
- Condition: fatigue, lack of sleep and alcohol slow reactions a lot.
- Age: reactions are usually fastest in your early-to-mid twenties and slow gradually with age.
- Practice: after a few tries many people improve by 10โ30 ms as they get used to the device.
FAQ
What is a normal reaction time?
Simple reaction time to a visual signal is usually about 200โ300 ms. Measured in a web browser, mouse and screen delays add time, so 250โ300 ms is common.
I got under 100 ms. Is that real?
Humans need at least about 100 ms to see and respond. A faster time most likely means you anticipated the change and got lucky.
Is a phone or a computer faster?
It depends on the device. A computer with a high-refresh monitor and a wired mouse usually has the edge; phones can be tens of milliseconds slower because of touch latency.
Where are my records stored?
Your best scores and last 10 results are stored only in this browser and never sent to a server. Clear records deletes them anytime.