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. --- What's Wrong with HSL HSL was a huge improvement over hex when it was introduced because it gave intuitive axes: hue, saturation, lightness. But the L in HSL is not perceptual lightness — it's a mathematical formula applied to RGB channels. The result is that identical L…
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