ReactionTest
// 1924. IDEOLOGY IS SPEED.

REACTION TIME

Wait for the screen to turn green. Then click.

Reaction Time Test

Click to start

When the box turns green, click as fast as you can. Don't click early - that's a false start.

Tap anywhere in this box, or press Space

How to improve your reaction time

01

Get enough sleep

Reaction time is one of the first things to suffer from sleep deprivation. A well-rested brain responds measurably faster.

02

Stay hydrated

Even mild dehydration slows cognitive response. Water first, test second.

03

Use a wired mouse

Wireless input adds 1-4ms of latency on average. A wired mouse on a high-polling-rate pad is the fastest setup.

04

Eliminate distractions

Close other tabs. Turn off notifications. Full-screen the test for the best focus.

05

Practice consistently

Reaction time improves with deliberate practice. Test daily for a week and you'll see your average drop.

06

Use a fast monitor

144Hz+ reduces input lag from the display side. The lower the total pipeline latency, the faster your clicks register.

What's a good reaction time score?

Under 200msElite - very rare, likely pro gamer / athlete
200-250msFast - trained or naturally quick
250-320msAverage - typical for an untrained adult
Over 320msSlower than average - might be tired or distracted

The 250ms average comes from published research across large samples. Individual variation is wide - your best score will be 30-50ms better than your average.

FAQ

How is my reaction time measured?
The time between the box turning green and your click, measured in milliseconds using the browser's high-resolution performance.now() API. We take 5 trials and report the average.
What happens if I click too early?
That trial is void. The box turns yellow and you click to retry. Your final average only includes valid trials.
Is my score saved?
Yes - your best (lowest) average is saved in your browser's localStorage. Nothing is sent to a server.
Can I share my score?
Yes. After the test, click 'Share your score' to post a 1200x630 image to Twitter or your device's share menu.
Why is my score different each time?
Reaction time varies based on focus, fatigue, time of day, and random factors. The 5-trial average smooths this out. Your best score is the meaningful number.

More tests

Reaction time is one part of the picture. Pair it with these other human benchmark tests to see your full input-speed profile:

Click Speed (CPS) Test →Typing Test (WPM) →Aim Trainer →

We also run ColorMix, a free color palette tool for designers and illustrators.