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Reaction Time

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About

Reaction Time measures how fast you click once the panel turns green. Click too early and it tells you off. Your best time is kept on this device.

How it works

After a random 1.2–4.2s delay the panel goes green and a performance.now() timestamp is taken; your click measures the delta in milliseconds. Best is stored in localStorage under kaspirius:reaction:best.

Metadata
title
Reaction Time
description
Test your reaction time in the browser — wait for green, then click as fast as you can. Best time saved locally, measured to the millisecond.
canonical
https://kaspirius.com/reaction
updated
Last updated
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Structured data (JSON-LD)
TechArticle

Same as Article, flagged as technical/developer reference material.

{
  "@context": "https://schema.org",
  "@type": "TechArticle",
  "headline": "Reaction Time — test",
  "description": "Test your reaction time in the browser — wait for green, then click as fast as you can. Best time saved locally, measured to the millisecond.",
  "url": "https://kaspirius.com/reaction",
  "mainEntityOfPage": {
    "@type": "WebPage",
    "@id": "https://kaspirius.com/reaction"
  },
  "datePublished": "2026-06-18",
  "dateModified": "2026-06-18",
  "author": {
    "@type": "Person",
    "name": "kaspirius",
    "url": "https://kaspirius.com"
  },
  "publisher": {
    "@type": "Organization",
    "name": "kaspirius",
    "url": "https://kaspirius.com"
  }
}
↖ kaspirius