- How to measure reaction time: ruler drop, web tests and appsRuler drop cm→ms chart · web · app · what each measures
- Average reaction time in milliseconds, and why your result is slowerVisual ~190 ms · auditory ~160 ms · why test conditions matter
- How a reaction time percentile is calculated, and how to read ranks and Brain Scorez-score · top-% chart · S+ to D thresholds · Brain Score is not IQ
- Why reaction time test results differ from phone to phone60 Hz vs 120 Hz frames · touch delay · Bluetooth audio lag
- The 0.1-second false-start rule and too-early taps in reaction testsMoving within 0.1 s = false start · anticipation · random waits
- How to track reaction time against sleep, coffee and time of day17–19 hours awake · same time, same difficulty · watch the spread
- How to move reaction test records to a new phone (JSON backup)Export backup · restore overwrites · ad unlocks don’t transfer
- How to start the driving conversation with aging parents using a reaction testLicense renewal rules for older drivers · conversation steps · compare with yourself
- Fair rules for reaction time challenges at partiesSame phone, same difficulty · one warm-up · Daily Challenge for remote duels
- For gamers: measuring reaction time and aim separatelyReaction, aim, inhibition, peripheral · 144 Hz frame math · train the weak spot
Reflex Lab: Brain Speed Test
No sign-up, fully offline, records stay on your device. Free on Android.