Reaction time test
Wait for the visual signal, then respond as quickly as you can without clicking early.
Enable JavaScript for the interactive test. The instructions below remain readable without JavaScript.
Open the interactive testHow to take this test
- Begin the round and keep the pointer or finger ready while the stage waits.
- Respond when the signal changes; the result is recorded in milliseconds.
Frequently asked questions
Why can reaction results vary?
Display refresh, input latency, attention, and anticipation all matter. Compare repeated results on the same device for a steadier reference.