OKLCH Studio · color reference

zinc-900 in OKLCH

Tailwind v4 zinc-900: oklch(0.210 0.006 285.9), HEX #18181B. WCAG + APCA pairs, Fix deep links, and @theme snippet.

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

#18181B · oklch(0.210 0.006 285.9)

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 white17.72:1 · AAA · Lc 105
#18181B on #FFFFFF
Open in Contrast →
White on swatch17.72:1 · AAA · Lc 107
#FFFFFF on #18181B
Open in Contrast →
Black on swatch1.19:1 · Fail · Lc 0
#000000 on #18181B
Open in Contrast →
Suggested text on swatch17.72:1 · AAA · Lc 107
#FFFFFF on #18181B
Open in Contrast →

Against #121212: On near-black (#121212), Fix nudges this stop to #838387 for AA text.

@theme {
  --color-zinc-900: oklch(0.210 0.006 285.9);
}

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