⚡ Reaction Time Test
Free online reaction-speed self-test: Simple RT (tap when signal turns green), Choice RT (4-color choice response), and Go/No-Go (respond to green, not red). Configurable 3 / 5 / 10 / 20 trials, sub-millisecond timing with double-rAF baseline, false-start detection, MAD-based outlier rejection, median / SD / IQR statistics, and 6-tier neutral performance banding. Mobile-first (touch-action manipulation, full-screen tap zone, ≥72px targets), fully bilingual, keyboard-accessible, reduced-motion aware, optional 30-day local history, setup-only share URLs, PNG result poster export. Browser-local — no login, default no ad scripts, default no third-party analytics, no upload. For entertainment and personal reference only; not a medical, psychological, or neurological assessment, and not a substitute for professional driver-license testing.
Disclaimer
This is a consumer-grade reaction-speed self-test toy intended for entertainment and personal comparison. It measures the delay between a visual signal and your keypress.
This is not equivalent to a driving reaction test and cannot substitute for driver-license testing, driving-aptitude evaluation, occupational qualification, or legal determination. It is not a medical, psychological, or neurological assessment of any kind. Attention, cognitive function, neural conditions, and age-related capacities are all outside the scope of this tool. Please consult a licensed professional if you need a formal evaluation.
Results are affected by screen refresh rate, input latency, browser scheduling, fatigue, and mood; display latency is not compensated. This tool runs locally in your browser — no data upload, no account, default no ad scripts, default no third-party analytics. The 30-day local history is opt-in and can be cleared with one click.
Start the test
Simple RT: wait for the background to turn green, then tap or press Space as fast as you can.
Shortcuts: Space / Enter to start and respond; Escape to abort; R to restart.
Online reaction time test with three modes: Simple RT (tap when signal turns green), Choice RT (four-color choice response), and Go/No-Go (respond to green only, withhold on red). Sub-millisecond timing via double requestAnimationFrame baseline + event.timeStamp. Mode-aware invalid-sample detection (SRT/GNG <100ms, CRT <150ms, >3000ms timeout, and wrong CRT answers excluded from valid scores). MAD-based outlier rejection with median / mean / sample standard deviation / IQR summary, and six neutral tier labels. Mobile-first: touch-action manipulation removes 300ms tap delay, full-screen tap zone, ≥72px targets. Keyboard Space / Enter / Escape / R. Reduced-motion compatible. Optional 30-day local history (opt-in, one-click clear). Setup-only share URLs (never shares results). PNG poster export. Browser-local — no login, default no ad scripts, default no third-party analytics, no upload. For entertainment and personal reference only; not a medical, psychological, or neurological assessment, not equivalent to a driving reaction test, and not a basis for occupational or legal determination.