Contact

The fastest way to reach us is email: hello@reactiontimecheck.com. We usually reply within two business days.

For bug reports, please include the browser you are using, the device, and its display refresh rate if you know it. Scoring questions almost always come down to that combination — a 60 Hz phone and a 144 Hz monitor are not measuring the same thing, and how the measurement works explains what the test corrects for and what it deliberately leaves in.

Corrections to the guides are welcome and get acted on. If a figure on this site disagrees with a source you trust, send the source — several numbers here are ranges precisely because the underlying studies disagree, and the pages say so where that is true.

What we cannot help with: anything medical. This site measures performance on a screen and nothing else. If you are worried about a change in your reaction time, attention or coordination, please speak to a doctor rather than to us.