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Color Test

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About

Color Test is the classic "find the different square": every level the grid gets bigger and the odd swatch gets closer to its neighbours. Miss once and it ends. How fine is your colour vision?

How it works

Each round picks a random HSL base and offsets one tile's lightness by a gap that shrinks with the level (down to a 3% difference). Grid grows from 2×2 to 6×6. Best level is stored in localStorage under kaspirius:color-test:best.

Metadata
title
Color Test
description
Spot the odd colour out as the grid grows and the difference shrinks — a browser colour-acuity test. Best level saved locally.
canonical
https://kaspirius.com/color-test
updated
Last updated
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Structured data (JSON-LD)
TechArticle

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

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  "@context": "https://schema.org",
  "@type": "TechArticle",
  "headline": "Color Test — test",
  "description": "Spot the odd colour out as the grid grows and the difference shrinks — a browser colour-acuity test. Best level saved locally.",
  "url": "https://kaspirius.com/color-test",
  "mainEntityOfPage": {
    "@type": "WebPage",
    "@id": "https://kaspirius.com/color-test"
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  "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"
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}
↖ kaspirius