OKLCH Color Guide: The Perceptual Color Space for Modern CSS
Learn OKLCH, the perceptual color space now available in CSS. Understand lightness, chroma, hue axes, and why it beats HSL for UI design.
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Tags: css, color, developer-tools
OKLCH Color Guide: The Perceptual Color Space for Modern CSS OKLCH is the color format you should use for new CSS work. It replaced HSL as the recommendation in the CSS Color Level 4 spec, it's supported in all modern browsers, and Tailwind v4 adopted it as the default for its entire built-in palette. Understanding why it's better and how to migrate your existing colors takes about an hour. The payoff is a color system that behaves predictably. You can convert any hex or HSL value to OKLCH in the color picker tool. OKLCH Syntax Lightness — 0 (black) to 1 or 0% to 100%. Perceptually linear. Chroma — 0 (grey, no color) to ~0.37 (maximum saturation). The actual maximum varies by hue — not all colors exist at in all hues. Hue — 0–360 degrees, same as HSL. Red is near 0/360, green near 145,…
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