How fast is your brain really?
Five quick reactions. We drop your best and worst, average the rest, and compare against published age-band benchmarks (Deary & Der 2005; Woods et al. 2015).
How it works
01
Wait for green
Screen turns purple. Stay calm. After a random 1.5-5 seconds it flashes green.
02
Click fast
Tap or click the instant green appears. We measure your reaction in milliseconds.
03
Five rounds
We drop your best and your worst, then average the rest for a stable score.
Click too early = round restarts. Make sure you are alert, caffeine-stable, and not multitasking for best accuracy.
Reference: Deary IJ, Der G. Aging Neuropsychol Cogn. 2005;12:187-215; Woods DL et al. Front Aging Neurosci 2015;7:131. Simple-reaction-time tests are sensitive to caffeine, sleep, distractions and input lag — re-test under controlled conditions for stable comparison. Persistent sudden slowing of reflexes warrants a clinician visit.