Measure your reaction time
Median human visual reaction is around 250 ms — see where you land.
Tools used in this guide
The job
Press start, wait for the green, click. The delay before green is randomized so you cannot time it — anticipation gets punished as a false start.
Getting a real number
One attempt is noisy — run at least five and read the mean or median. Clicks under 80 ms are counted as early taps (you guessed), not reflexes.
Hardware matters: a gaming monitor and wired mouse score better than a laggy trackpad. Comparing your own numbers on the same setup is the fair comparison.
What it is not
This includes your display's frame delay and input latency — it is a practical self-check, not a clinical measurement. Nothing is saved between visits.