A comprehensive React component library built with Tailwind CSS v4, offering accessible UI primitives with a clean, customizable design system.
React components with Base UI primitives for accessibility
Token-based design system with extended color variants
CLI tool for automated component installation
AI-optimized documentation with Copy Markdown feature
Fully customizable styling via CSS variables
Coss UI is a modern React component library built by the Cal.com team, providing developers with accessible, customizable UI primitives that follow best practices. The library leverages Tailwind CSS v4 and uses a token-based design system that makes it easy to maintain consistent styling across projects.
The components are structured into primitives, particles, and atoms, giving developers flexible building blocks for creating polished interfaces quickly. With both CLI and manual installation options, Coss UI helps teams standardize their UI development while maintaining the freedom to customize components to match their brand.
Web applications, SaaS platforms, dashboards, and any React project requiring consistent, accessible UI components.
React components with Base UI primitives for accessibility
Token-based design system with extended color variants
CLI tool for automated component installation
AI-optimized documentation with Copy Markdown feature
Fully customizable styling via CSS variables
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