About Fast Reaction Test
What we do
Fast Reaction Test helps you measure and train reaction speed and related skills in the browser. Our flagship Reaction Benchmark runs five timed rounds with median score, consistency, and session history — no download or signup.
Who we are
Fast Reaction Test is an independent project at fastreactiontest.com. We build simple, fast web tools that work on desktop and mobile and are available in many languages.
Why it’s free
The site is supported by advertising. Core tests remain free so anyone can practice and compare scores on equal footing using the same device over time.
Accuracy
We time reactions with high-resolution browser APIs. Your monitor refresh rate and input device still affect results — we explain this on each test so you can interpret scores fairly.