How the reaction time test works
- Click or tap the big box to start. It turns red: wait.
- After a random delay it turns green: click or tap immediately.
- Clicking before green counts as a false start, and that try is replayed.
- After 5 tries you get your average and your best time. Your best score is saved on this device.
You can also press the Space key instead of clicking.
Want more challenges? Try the CPS test to see how fast you click, or the typing test for your words per minute.
What is a good reaction time?
There is no single official average, because results depend a lot on the device and the test. As a rough guide, many people score somewhere around 200 to 300 milliseconds on this kind of online test. Below 200 ms is very fast. Your result also depends on your device: screens, mice and touchscreens add a small delay, so compare scores on the same device.
How to improve your reaction time
- Sleep well: tiredness slows reactions more than almost anything else.
- Warm up with a few tries before the ones that count.
- Use a wired mouse and a high refresh rate screen if you have one.
- Stay relaxed: tense fingers react later.
Frequently asked questions
What is the average human reaction time?
For a simple “react to a color change” test like this one, results often fall around 200 to 300 ms. It varies with age, fatigue, attention and the device you use.
Why is my score different on my phone?
Touchscreens, screen refresh rates and browsers add small delays. Compare your scores on the same device for a fair comparison.
Is my score saved?
Your best average is saved in this browser only. Nothing is sent to us.
Last updated: October 20, 2026