About Reaction Time Test

Reaction Time Test is a free, no-nonsense tool for measuring how fast you respond to what you see. No accounts, no ads-for-your-data, no clutter — just a clean test that works everywhere.

The idea is simple: a box changes colour and you click as fast as you can. Behind that simplicity is a precise millisecond timer and a design built to be fair, fast and fun on any device.

We built this for gamers, athletes, students, curious minds and anyone who has ever wondered “how fast am I, really?”. Every result is calculated in your own browser and never leaves your device.

The site is available in many languages so anyone, anywhere, can test their reflexes in their own tongue.

What we care about

• Privacy first — your scores stay on your device.
• Fast and lightweight — no bloated trackers.
• Free forever — no paywalls, no sign-up.
• Accessible — works on any phone, tablet or computer.