Color and Contrast: Building a Palette, Semantic Colors, OKLCH and WCAG Contrast Ratios
An interface palette is made of a brand colour, a neutral scale and semantic colours; with OKLCH and the same lightness steps, the same-numbered shade of every colour gives almost the same contrast against white. In Bookstore's catalogue we measure WCAG 2.2 ratios with our own script and axe-core, fix 8 failing texts and a stock status shown by colour alone, re-tune dark mode instead of inverting it, and explain where APCA stands today.
14 Nov 2026
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14 min
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15
