Reaction Time Test
Utility ToolsTest how fast you react in milliseconds
Average human reaction time is about 250 ms. Under 200 ms is excellent. Screen and touch delay adds a little.
Embed this tool on your websiteFree
- Choose how tall the frame should be.
- Press Copy code.
- Paste it into your page, blog, WordPress or Notion HTML block.
The tool runs inside your visitor's browser, nothing is uploaded, and a small "Powered by ToolCloak" line stays under it. The second line (script) is optional: it makes the frame fit the tool's height.
Similar tools you may like
History
All history →Reaction Time Test — at a glance
Measure how quickly you react to a visual signal.
How to use it — step by step
Nothing. Tap when the box turns green.
Tap to start
The box turns red.
Wait for green
Do not tap early.
Tap at once
Your time in milliseconds appears.
Pro tips
Small things that make the result better.
Quick facts
Frequently Asked Questions
What is a good time?+
Under 200 ms is excellent, 200–300 ms is normal.
Why do I get "too soon"?+
You tapped before the box turned green.
Does my screen affect it?+
Slightly. Touch screens and displays add a few milliseconds of delay.
Is my data safe?+
Yes. Everything runs inside your own browser. Your text, files and images are never uploaded to any server.
Is this tool really free?+
Yes — completely free, no signup, no watermark and no usage limit.