Free tools
Tools.
Two small, useful tools built on the same color library that powers the rest of the site. Paste a color, get an answer. No signups, no tracking, no ads.
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WCAG 2.1 ratio calculator
Contrast Checker
Paste any two colors, get the contrast ratio and WCAG AA/AAA grades. See how the pair looks on real body text, headings, and buttons before you ship.
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Start with one color, find 378 historical matches
Palette Finder
Pick a hex and we'll surface the closest colors from the full Sanzo Wada catalog — plus every historical palette that uses them. The fastest way to anchor a brand in the tradition.
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Why these tools
Most contrast checkers are buried under ads. Most palette generators spit out randomized hues with no history behind them. These two do one job each, grounded in the 378 palettes from the full Sanzo Wada catalog. Bookmarkable, shareable, free — built for the browser tab you keep open while you work.