Arc: Animated React Components and UI Blocks for shadcn and AI Workflows

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Arc (uiarc.dev) is a React component and block library built with native motion and animations. It includes 140 UI components and 83 ready-to-use blocks designed to be installed via the shadcn CLI, an MCP server, or AI coding tools like Cursor and Claude.

Key points

  1. Library scope: Features 140 React components and 83 pre-built blocks (such as dashboards, chats, and workflows) with embedded animations.
  2. Open-source core and Pro tier: 100 core components and 22 starter blocks are free; a Pro upgrade adds 40 motion-heavy components and 61 full screens and sections.
  3. shadcn-style ownership: Components are added directly into project repositories as source code, allowing customisation of tokens, styling, and logic.
  4. Optimised for AI development: Supports direct integration via shadcn CLI, an MCP server, llms.txt, and Markdown-based documentation readable by LLMs.
  5. Accessibility & themes: Built-in support for reduced-motion preferences, alongside light and dark modes.

Why it matters

Adding polished, performant micro-interactions to modern web applications usually requires substantial custom engineering. Arc pairs pre-configured motion design with the popular shadcn distribution pattern, making advanced UI patterns immediately accessible to teams and AI assistants.

Analysis

Arc effectively taps into the shift toward copy-paste UI registries over heavy monolithic dependency trees. By integrating natively with MCP and structuring docs specifically for AI coding agents (Claude, Cursor, Codex), it aims to make interactive, animated interfaces as quick to scaffold via prompt as plain HTML forms.

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Summary generated by AI (Gemini 3.8 Flash, 1 October 2026). It may contain errors – the original source is authoritative.

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