Tests
Reaction Time Test
Wait for the signal, then click as quickly as you can. Complete five attempts. Clicking before the signal is a false start and does not count as an attempt.
Private by designProcessing happens locally in this browser. Device streams and raw readings are not uploaded.
What this test checks
How to use this test
Wait for the signal, then click as quickly as you can. Complete five attempts. Clicking before the signal is a false start and does not count as an attempt.
What the results mean
Lower times mean faster responses in this session; the median reduces the influence of a single slow attempt.
Troubleshooting
Use the same input device and display, avoid distractions and restart after an interruption.
Browser limitation
Browser timing, display and input delays affect the result. Compare repeated sessions on the same device; this is not a hardware or medical diagnosis.