# FastMCP > The fast, Pythonic way to build MCP servers and clients. ## Docs - [App Architecture](https://gofastmcp.com/apps/architecture.md): How FastMCP apps work under the hood — from Python to pixels. - [Development](https://gofastmcp.com/apps/development.md): Preview and test your app tools locally without a full MCP host. - [Examples](https://gofastmcp.com/apps/examples.md): Example apps you can run right now. - [Generative UI](https://gofastmcp.com/apps/generative.md): Let the LLM build custom Prefab UIs on the fly. - [FastMCPApp](https://gofastmcp.com/apps/interactive-apps.md): Managed tool binding, visibility, and composition for apps with heavy server interaction. - [Custom HTML Apps](https://gofastmcp.com/apps/low-level.md): Build apps with your own HTML, CSS, and JavaScript using the MCP Apps extension directly. - [Apps](https://gofastmcp.com/apps/overview.md): Give your tools interactive UIs rendered directly in the conversation. - [Patterns](https://gofastmcp.com/apps/patterns.md): Copy-paste examples for common tool UIs. - [Prefab UI](https://gofastmcp.com/apps/prefab.md): The component library behind FastMCP apps — charts, tables, dashboards, forms, and reactive di…