xiry.

Development · Web app

coss ui

Modern UI component library built on top of Base UI

From the Xiry library · Updated 3 October 2026

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coss ui is an open-source React component library built on Base UI designed for both human developers and AI coding workflows. It provides over 500 modular components and particles spanning form inputs, navigation, overlays, and feedback elements. It speeds up interface development by offering accessible, ready-to-use primitives that can be integrated directly into web projects.

What it's for

  • Drop prebuilt UI components like dialogs, inputs, and tabs into React applications
  • Build accessible web forms using native-compliant field, fieldset, and input components
  • Provide standardized UI building blocks to AI coding assistants

Features

  • Extensive component catalog covering accordions, modals, tables, and date pickers
  • Built on top of Base UI primitives for standard accessibility and behavior
  • Over 500 individual particles and components available to browse
  • Built-in support for light and dark themes
  • Designed to be easily consumed by AI-assisted development tools
  • Open-source repository hosted on GitHub

Pricing

Free and open source

Details

Type
Web app
Category
Development
Topic
UI Components
Open source
Yes
Platforms
Web, Code library
For
React and web developers building modern web apps
Alternative to
shadcn/ui, Radix UI, Chakra UI
Tags
react, ui components, base ui, design system, frontend, open source

Why it was saved

  • @kalypsodesigns, 27 February 2025: Speeds up UI development by providing modular, ready-to-use modern components across categories like buttons, dialogs, accordions, and inputs.
  • @pacovitiello, 15 May 2025: Production-quality tree view pattern: nested folders, filter input, auto-expanding matches, drag-and-drop reordering.

Compare

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