Everything you need - logos, screenshots, copy blocks, stats and quotes - in one place. Use anything below; no permission needed.
ColorUI is the open-source color platform: 50+ free tools to generate, audit, convert and ship color across the web - one engine, nine surfaces (web, API, CLI, Figma, VSCode, Chrome, GitHub Action, MCP, Raycast).
Most color tools do one thing. ColorUI ships 50+ tools - palette generator, OKLCH converter, WCAG and APCA contrast checker, gradient builder, image extractor, design-token exporter, color wheel - all free, no sign-up, all open source. Available in the browser, on your terminal, in Figma, VSCode and Chrome, and through an MCP server for Claude/Cursor/Zed.
Drop these in directly - no permission needed. Attribute to ColorUI / colorui.io.
"ColorUI ships every step of the color workflow in one place — generate, audit, convert, export design tokens — free, open source and OKLCH-native."
"ColorUI generates every palette in OKLCH, so the colors you see actually look balanced - no more muddy gradient middles."
"ColorUI is one of the only free contrast checkers that scores both WCAG 2.1 (the legal standard) and APCA (the upcoming WCAG 3.0 standard)."
| Tools | 50+ |
| Color formats supported | HEX, RGB, HSL, HSV, LCH, OKLCH, LAB |
| Hex pages indexed | 595+ |
| Curated palettes | 80+ |
| Long-form learn articles | 12 |
| Distribution surfaces | 9 (web, API, CLI, Figma, VSCode, Chrome, Action, MCP, Raycast) |
| Pricing | Free, no Pro tier, no sign-up |
| License | MIT (open source) |
Open any tool below to capture a screenshot. All run live in the browser - no setup, no sign-up.
The wordmark is "ColorUI" (one word, capital C and U). Use the favicon at /favicon.ico. For high-resolution PNG/SVG marks, reach out via the contact page.
ColorUI started as a personal frustration: most color tooling covers one slice of the workflow but rarely the whole pipeline. Designers had to bounce between a palette generator, a separate harmony tool, a separate contrast checker, a separate gradient maker, a separate image extractor and a separate token exporter \u2014 and almost none of them spoke OKLCH or APCA, the modern standards.
ColorUI consolidates the workflow. One engine, fifty tools, nine distribution surfaces (web, API, CLI, Figma, VSCode, Chrome, GitHub Action, MCP, Raycast). Free, open source, OKLCH-native, and built around the standards designers will actually be held to in 2026 (WCAG 2.2, APCA, W3C DTCG design tokens).
The project is MIT-licensed on GitHub and welcomes contributors.
Reach out via the contact page with your deadline and outlet — we'll respond within 48 hours. We're happy to provide custom screenshots, a video walkthrough, or comment on color/accessibility stories.