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OKLCH color space reference for CSS. Use when: choosing colors, building palettes, converting hex/rgb/hsl to oklch, checking perceived lightness, creating accessible color scales, working with P3 or wide-gamut colors.
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| name | oklch-colors |
| description | OKLCH color space reference for CSS. Use when: choosing colors, building palettes, converting hex/rgb/hsl to oklch, checking perceived lightness, creating accessible color scales, working with P3 or wide-gamut colors. |
OKLCH captures perceived Lightness, Chroma, Hue, and Alpha. Values are human-readable and differences are predictable just by reading them. It represents wide-gamut colors (P3, Rec2020) that HSL and RGB cannot.
OKLCH improves on LCH by fixing a bug in the blue chroma range and providing better gamut correction.
.c { color: oklch(0.8 0.12 100 / 100%); }
/* ^ ^ ^ ^
| | | |
lightness | | |
chroma | | |
hue | |
alpha */
0–1: Perceived brightness. 0 = black, 1 = white. Equal steps look equal.0–0.4: Color intensity. 0 = gray, higher = more vivid. Most usable colors sit between 0.05–0.2.0–360: Color wheel angle. 0 = pink/red, 90 = yellow, 150 = green, 225 = blue, 300 = purple.0%–100%: Opacity. Optional, defaults to 100%..bw {
color: oklch(0 0 0); /* black */
color: oklch(1 0 0); /* white */
color: oklch(0.5 0 0); /* gray (any hue at chroma 0 is gray) */
}
.colors {
color: oklch(0.8 0.12 100); /* yellow */
color: oklch(0.6 0.12 100); /* darker yellow — only lightness changed */
color: oklch(0.8 0.05 100); /* grayish yellow — only chroma changed */
color: oklch(0.8 0.12 225); /* blue, same perceived lightness as the yellow */
}
.opacity {
color: oklch(0.8 0.12 100 / 50%); /* 50% transparent yellow */
}
L=0.7 appear equally bright regardless of hue — not true in HSL.To create a color scale with guaranteed contrast:
/* Same hue (250 = violet), decreasing lightness */
--violet-100: oklch(0.95 0.03 250); /* lightest, backgrounds */
--violet-300: oklch(0.80 0.08 250); /* borders, subtle accents */
--violet-500: oklch(0.65 0.15 250); /* primary accent */
--violet-700: oklch(0.45 0.15 250); /* dark foreground on light bg */
--violet-900: oklch(0.25 0.10 250); /* darkest, text on light bg */
Each 0.15 lightness step gives roughly 3:1 contrast between adjacent levels.
Tinted neutrals — warm or cool grays with a subtle hue:
--neutral-warm: oklch(0.95 0.01 60); /* warm off-white */
--neutral-cool: oklch(0.95 0.01 250); /* cool off-white */
Semantic colors — consistent lightness for equal visual weight:
--success: oklch(0.72 0.17 145); /* green */
--warning: oklch(0.80 0.16 75); /* amber */
--error: oklch(0.65 0.20 25); /* red */
--info: oklch(0.70 0.12 240); /* blue */
Dark mode counterparts — same hue/chroma, higher lightness:
/* Light mode accent */
--accent: oklch(0.55 0.20 285);
/* Dark mode — raise lightness to maintain contrast on dark bg */
--accent: oklch(0.75 0.15 285);
npx convert-to-oklch ./src/**/*.css