About us
Making reaction time testing simple, accurate and accessible for everyone
ReactionTestTime is a free toolkit for measuring, understanding and improving reaction time, built around precise browser timing, a transparent methodology and statistics that come only from real tests.
- AccurateHigh-precision timing
- Real dataNo invented numbers
- FreeNo account needed
Our mission
Help people understand their reactions
Reaction time is one of the simplest things you can measure about how your brain and body work together, yet most online tests don't explain how they measure, and many publish averages nobody can verify. We want to do better: precise tests, clear explanations and honest data.
Guides and tests are written and reviewed by ADR.
Try a test nowWhat we do
Interactive tests
Nine tests covering visual, audio, keyboard, choice, aiming and F1-style start reactions.
First-party statistics
Anonymous results become averages, distributions and percentiles.
Educational guides
Sourced explanations of what affects reaction time.
Progress tracking
Your recent results and personal best, stored on your device.
Why it matters
Reaction time shows up everywhere
Gaming
Faster, more consistent responses matter in competitive play.
Sport
Starts, returns and saves all begin with a reaction.
Focus
Slower, more variable reactions can be a sign of fatigue.
Everyday life
From driving to catching a falling glass.
Our data philosophy
Real users. Real numbers. Nothing invented.
Every statistic on this site comes from anonymous tests completed on ReactionTestTime. We don't copy averages from other websites, and we don't display percentiles, rankings or user counts until there's enough real data to support them. Until then, you'll see “Data collection in progress.”
We never infer sensitive attributes like age or gender. Age statistics use only age ranges people choose to share.
Accuracy approach
Simple tests. Careful measurement.
Tests run entirely in your browser using the high-resolution performance.now() clock. Signals appear after random delays, early responses are rejected, and your result is calculated before anything is sent over the network, so your connection speed can never affect it.
We're also honest about limits: browser tests include device latency and are not medical measurements.
Our principles
Accuracy first
Fair, repeatable tests and a published methodology.
Free and accessible
No sign-up. Keyboard, mouse and touch supported.
Privacy by default
Anonymous results; no precise location or identity.
Honest data
We only publish what the data actually supports.
Ready to test your reaction time?
Five attempts, about a minute. See your average, median and consistency instantly.