Terms of Use

Plain rules for a free measurement tool.

Use of the site

You may use the results however you like, including publishing them, provided you do not attempt to disrupt the service, game the leaderboard when one exists, or present these numbers as something they are not.

No medical or diagnostic claim

Nothing here is medical advice, psychological assessment or a diagnostic instrument. Reaction time is affected by sleep, medication, fatigue and hardware. If you have a genuine concern about cognitive or motor function, speak to a clinician rather than a web test.

No warranty

Tools are provided as-is without warranty of any kind. Readings are software estimates on consumer hardware and are not suitable for legal, insurance, employment or safety-critical decisions.

Fair play

Readings that trip the anti-cheat checks — sub-80 ms responses, tab-switching mid-round, duplicate input inside 100 ms, or click rates beyond the human envelope — are flagged and excluded from averages. This protects the value of the numbers, not our ego.