Reaction Time Test
Wait for green, click as fast as you can — measures reflexes in milliseconds.
How to use Reaction Time Test
Follow these steps — everything happens instantly in your browser.
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Step 1. Click anywhere in the panel to start. The panel turns red.
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Step 2. Wait for it to flip to green — the delay is random each time.
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Step 3. Click immediately when you see green. Your reaction time is shown in milliseconds.
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Step 4. Click again to retry. The last 10 attempts are tracked below.
Why use this tool
Private by design
All processing happens locally in your browser. Open DevTools → Network and you'll see zero file uploads. Ever.
Instant
No upload wait, no queue, no server round-trip. Results appear the moment you drop a file.
Free & unlimited
No accounts, no watermarks, no daily caps. Use it as many times as you like, forever.
Works everywhere
Desktop, tablet or phone — every tool is responsive and installable as a PWA for offline use.
Frequently asked questions
Everything you might want to know about reaction time test.
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