OKLCH Studio · color reference

blue-900 in OKLCH

Tailwind v4 blue-900: oklch(0.379 0.146 265.5), HEX #1C398E. WCAG + APCA pairs, Fix deep links, and @theme snippet.

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

#1C398E · oklch(0.379 0.146 265.5)

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 white10.37:1 · AAA · Lc 94
#1C398E on #FFFFFF
Open in Contrast →
White on swatch10.37:1 · AAA · Lc 98
#FFFFFF on #1C398E
Open in Contrast →
Black on swatch2.03:1 · Fail · Lc 10
#000000 on #1C398E
Open in Contrast →
Suggested text on swatch10.37:1 · AAA · Lc 98
#FFFFFF on #1C398E
Open in Contrast →

Against #121212: On near-black (#121212), Fix nudges this stop to #5B81DD for AA text.

@theme {
  --color-blue-900: oklch(0.379 0.146 265.5);
}

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