Hue Codex - Free color tools for design systems

Hue Codex is a free, no-account color workspace for designers and developers. It brings color picking and conversion, role-based palette generation, WCAG contrast checks, OKLCH and modern CSS workflows, gradients, image color extraction, accessibility utilities, and production-ready exports into one connected experience. Users can move colors between tools, share exact tool states by URL, and save work locally in the browser without creating an account. Transparent methodology explains which results are standards-based, heuristic, approximate, or browser-dependent.