sunpeak

sunpeak is an open-source MCP (Model Context Protocol) App framework and ChatGPT App framework that helps developers build, test, and deploy applications embedded in ChatGPT, Claude, and other AI hosts. Built on Next.js, it provides a complete developer toolchain including local simulator, UI component library, dev server, and CLI tools. Developers can use a single codebase to build interactive apps for multiple AI hosts, achieving write once, deploy anywhere goal.

Local ChatGPT App Simulator

Run local development environment simulating ChatGPT and Claude App runtime without needing a paid account for MCP App and ChatGPT App testing.

MCP App UI Component Library

20+ pre-built React Hooks following ChatGPT design guidelines for simplifying App development including iframe renderer, JINA components, and more.

MCP Dev Server

Hot-reloading dev server for rapid iteration of MCP Apps and ChatGPT Apps with mock data and debugging tools.

CLI Toolset

Complete CLI toolchain for project creation, building, testing, and deployment with Vitest and Playwright support for automation testing.

Cross-Platform Deployment

Deploy the same code to any MCP-compatible AI hosts including ChatGPT, Claude, and other compatible platforms, reducing multi-platform maintenance costs.

1. Visit https://sunpeak.ai/ and register for a free account
2. Run npm install -g sunpeak to install the CLI tool
3. Execute sunpeak new to create a new project, choosing MCP App or ChatGPT App template
4. Use sunpeak dev to start local dev server for live preview
5. Import and use sunpeak React Hooks for MCP functionality in your code
6. Run sunpeak test to execute local automation tests
7. Use sunpeak deploy to build production version and deploy to server

Open Source and Free

MIT licensed completely open source framework for personal and enterprise users to use, modify, and distribute freely without licensing fees.

Cross-Platform Compatibility

Single codebase deployable to ChatGPT, Claude, and other AI hosts, drastically reducing multi-platform maintenance costs and avoiding duplicate development.

Complete Toolchain

Complete solution from development to deployment including local simulator, dev server, CLI tools, and automation testing support.

Active Community

As an active open source community providing continuous updates and timely bug fixes.

All plans include 14-day free trial. See https://sunpeak.ai/pricing for details.

• https://sunpeak.ai/docs - Complete user guides and API reference
• https://github.com/sunpeak/sunpeak/issues - Submit issues and feature requests
• https://discord.gg/sunpeak - Connect with other developers

• Windows Client https://sunpeak.ai/download/windows — Windows 10/11 support
• macOS Client https://sunpeak.ai/download/mac — macOS 12+ support with Apple Silicon version
• Chrome Extension https://sunpeak.ai/download/chrome — Chrome/Edge support

Related Tools

• https://vercel.com/ — Platform for deploying MCP Apps and ChatGPT Apps
• https://nextjs.org/ — React framework for building sunpeak applications