How the test works
Click the panel once to arm the test. It turns red and holds for a random interval between two and five seconds, then flips to green and starts a millisecond timer. Your click stops it. The random wait matters: with a fixed delay you would learn the rhythm and be timing your click rather than reacting to it. Clicking while the panel is still red is a false start, is not recorded, and you simply click again to retry.
Plenty of people keep the typing speed test open alongside this one.
What your score means
Around 250 ms is the classic figure for simple visual reaction time, and most people land between 200 and 300 ms. Sound and touch signals are processed slightly faster than light. Scores under 150 ms are usually luck or a lucky guess at the timing, and anything under about 100 ms is faster than human nerve conduction allows. Your times get slower when you are tired, distracted, or have had alcohol, and they drift upward gradually with age.
Try the click counter when you want the outcome decided a different way.
Getting a fair reading
Part of what you measure here is your hardware: mouse polling, display refresh rate and browser timing all add a few milliseconds. Use the same device if you want to compare with a friend. Take at least five attempts and look at the average and best rather than one lucky click, and keep your finger resting on the button between goes so you are not measuring how long it takes you to reach it.
If you want a different flavour of the same thing, try the online stopwatch.
Frequently asked questions
- What is a good reaction time?
- Between 200 and 300 milliseconds is normal for a visual click test. Below 200 ms is fast, and regular gamers often sit in that band.
- Why does the green take a different time to appear?
- The delay is randomised between 2 and 5 seconds so you cannot learn the rhythm and click from memory instead of reacting.
- What happens if I click too early?
- It is flagged as a false start and nothing is recorded. Click the panel again to arm a fresh attempt.
- Does my hardware affect the result?
- A little. Mouse, monitor refresh rate and browser add a few milliseconds, so compare scores on the same device.
- Are my scores saved between visits?
- No. Your attempts live only in the open page and are cleared the moment you refresh or close the tab.