Reaction Time Test
Complete five rounds and find out how fast your reflexes really are.
Wait for the green signal, then click, tap or press Space as quickly as you can. Complete five rounds. These results include browser and display latency.
Test inputs stay in your browser. Only personal-best scores and keyboard preferences are saved locally; nothing is uploaded.
How to use this test
Start a round and wait until the test area turns green and shows the GO signal. Click, tap or press Space as soon as you see it. Each round has an independent random delay. An early response is excluded; start the same round again.
Complete five valid rounds to see your average, fastest, slowest and individual times. Your best five-round average is saved locally; lower is better. Hiding the tab cancels the active round so background delays are not mistaken for your reaction time.
Frequently asked questions
Do false starts affect the average?
No. Only the five valid responses are included.
What does the personal best measure?
The lowest average across a complete set of five rounds on this browser.