OKLCH Studio · color reference

indigo-900 in OKLCH

Tailwind v4 indigo-900: oklch(0.359 0.144 278.7), HEX #312C85. WCAG + APCA pairs, Fix deep links, and @theme snippet.

indigo-900 is a deep shade — strong for text on light surfaces and dark UI chrome. Pair with lighter stops for surfaces.

#312C85 · oklch(0.359 0.144 278.7)

Contrast pairs

WCAG 2.1 normal text + APCA Lc. Open a pair in the live Fix tool — informational only, not a legal audit.

Text on white11.48:1 · AAA · Lc 96
#312C85 on #FFFFFF
Open in Contrast →
White on swatch11.48:1 · AAA · Lc 100
#FFFFFF on #312C85
Open in Contrast →
Black on swatch1.83:1 · Fail · Lc 8
#000000 on #312C85
Open in Contrast →
Suggested text on swatch11.48:1 · AAA · Lc 100
#FFFFFF on #312C85
Open in Contrast →

Against #121212: On near-black (#121212), Fix nudges this stop to #6E74D4 for AA text.

@theme {
  --color-indigo-900: oklch(0.359 0.144 278.7);
}

Static reference — the live Fix tool uses the same WCAG math with Undo and share links.