Reaction Time Test
Click when the box turns green. The score is the number of milliseconds between the green and your click. Clicking early is a false start and is not saved.
Runs in your browser. Nothing you enter is uploaded.
Worked examples
One attempt
| Wait | Green appears after 1,200 ms plus a random 0 to 2,500 ms, so the wait is 1.2 to 3.7 seconds. |
|---|---|
| Click during the wait | The message is "Too soon, click to retry". Last and Best stay unchanged. |
| Click 250 ms after green | Last shows 250. Best becomes 250 if you have no faster scored click this visit. |
What the test records
| Action | Result |
|---|---|
| Click to start | Wait for green |
| Click before green | False start, not scored |
| Click after green | Last (ms) = clock at click minus clock at green |
| Best | Lowest scored time this visit. A reload clears it |
This page does not publish an average human reaction time. The introduction mentions a rough 200 to 300 ms range as a guide, and that figure is not a study cited here.
Test how fast your reflexes are with this simple reaction time game. Click to begin, then wait: the box will turn green after a random delay, and the moment it does you click as quickly as you can. Your reaction time is shown in milliseconds, and the tool keeps your best result across attempts so you can try to beat your own record. Most people react to a visual cue in roughly 200 to 300 milliseconds, so anything under that is genuinely quick. Watch out for clicking too early, which counts as a false start and asks you to try again. It is a fun way to warm up, compare with friends, or just see how sharp you are feeling. Everything runs locally in your browser.
How to use Reaction Time Test
- Start the test and wait.
- Watch for the box to turn green.
- Click the moment it turns green.
- Read your time and repeat to beat your best.
Frequently asked questions
Why did my click not count?
A click while the box still says to wait is a false start. Only a click after it turns green is scored.
How long is the wait?
Between 1.2 and 3.7 seconds, chosen at random each attempt.
Is my score uploaded?
No. Last and Best stay on the page until you reload.
Is Reaction Time Test any good?
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Link this tool from a README, doc or site. The badge links back to this page.
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