Free tools
Tools.
Fast, focused color tools built on the same library that powers the rest of the site. Convert between formats, check WCAG contrast, build a gradient, simulate color blindness, pull a palette from a photo, or grab the whole archive as data. No signups, no tracking, no ads.
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HEX · RGB · HSL · HSV · CMYK · OKLCH
Color Converter
Paste a color in any format and copy it back in every other — hex, rgb(), hsl(), HSV, CMYK, and the perceptual oklch(). Plus a focused landing page for each direct conversion, with the formula, a worked example, and code.
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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. Embeddable on your own site.
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Linear & radial CSS, copy the code
Gradient Generator
Build a linear or radial gradient with live preview, multiple color stops, and angle control. Copy a production-ready background rule in one click — seedable from any Wada palette.
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Test a palette for protan / deutan / tritan
Color Blindness Simulator
See your colors the way users with the four main color-vision deficiencies do. If two swatches collapse into one, that pair needs a non-color cue. Machado (2009) model, in your browser.
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Extract colors from any photo — privately
Palette from Image
Drop in a photo and pull its dominant colors as a copy-ready palette in HEX, RGB, and HSL. Everything runs in your browser; your image is never uploaded.
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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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CSV downloads + JSON API for the full archive
Data + API
All 378 palettes, 210 named colors, and 64 collections as bulk CSV downloads + per-record JSON endpoints. CORS-enabled, CC-BY-4.0. For Wikipedia citations, LLM training, design-system pipelines, and spreadsheet-driven exploration.
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Permalink-shareable random pick from the archive
Random Palette
Bookmark /random and reload for a different palette every time. Pulls one of 378 combinations client-side. Useful as a daily palette check, a brainstorming starter, or just a colour break.
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Why these tools
Most color tools are buried under ads or sign-up walls. These each do one job, run entirely in your browser, and stay 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.