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Kordu Tools

Reaction Time Test

Test your reaction time with a visual stimulus and track your speed across multiple attempts. See how you rank against human averages.

Reaction Time Test

Click Start, then wait for the screen to turn green.
Click as fast as you can when it does. 5 attempts per session.

Average

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Best

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Personal Best

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How to use

  1. 1

    Start the test

    Click the Start button to begin. A red area will appear — wait patiently for it to change.

  2. 2

    Wait for the green signal

    Keep your focus on the screen. After a random delay of one to five seconds the area turns green.

  3. 3

    Click as fast as you can

    As soon as you see green, click or tap anywhere on the coloured area. Your reaction time is recorded in milliseconds.

  4. 4

    Review your results

    After five attempts you will see your average time, best time, and a percentile ranking compared to the human average.

Frequently asked questions

What is a good reaction time?
The average human visual reaction time is roughly 200-250 ms. Anything under 200 ms is considered fast, under 150 ms is exceptional, and competitive gamers often aim for the 150-180 ms range.
Does this tool send my data anywhere?
No. The test runs entirely in your browser. Your personal best is saved to localStorage on your device and is never transmitted to a server.
Why do I sometimes get 'Too early'?
If you click before the screen turns green, the attempt is flagged as too early and does not count. This prevents anticipation clicks from skewing your results.
How many attempts are in one session?
Each session consists of five attempts. After all five, you see your average, best time, and percentile ranking. You can reset and run another session at any time.
Does hardware affect my score?
Yes. Monitor refresh rate, input lag, and mouse or touchscreen latency all contribute a few milliseconds. For the most accurate comparison, use the same device each time.

Measure how fast your brain responds to a visual cue with this free

reaction time test. Click the screen as soon as it turns green and get

an instant readout in milliseconds. Each session runs five attempts so

you can track consistency, and a percentile ranking compares your speed

to the human average (~250 ms). Your personal best is saved locally so

you can compete against yourself over time. Everything runs in your

browser — no data is collected or sent anywhere.

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