Alternatives to Openui

Open-source (MIT) MCP testing and full-stack MCP App framework for building ChatGPT Apps and Claude Connectors from one React codebase.

Open-source screenshot-to-code converter: drop in a mockup, Figma file, or screen recording, get HTML, React, or Vue back.

Open-source dev platform that combines no-code, full-code, and AI with reusable full-stack MicroApps.

Tempo Labs is an AI IDE for React teams: prompt components into existence, then refine them on a visual canvas both designers and engineers share.

Apidog binds API design, debugging, mocking, testing, and docs to one OpenAPI definition — with MCP and agent debugging built in.

CopilotKit is the open-source React framework for adding agent chat, generative UI, and shared state to any AG-UI backend.

Open-source TypeScript toolkit for building AI apps and agents across 100+ models with streaming, tools, and fallbacks

Devin Desktop (formerly Windsurf) is an agent-centric IDE for running fleets of local and cloud coding agents from one Sessions Board.

Open Design turns the coding agent you already run into a local-first design engine for prototypes, slides, and HTML video

Eino is an open-source Go framework from ByteDance for building LLM apps, agents, and graphs in your existing Go backend.

Open-source spec framework that keeps AI coding agents building the right thing, spec-first.

Open-source React toolkit for generative UI — let an agent render your own components from natural language

Marvin is an open-source Python framework that turns ordinary functions into AI-powered tools using decorators like @ai_fn and @ai_classifier.

Replit Agent turns a plain-English prompt into a runnable full-stack app inside your browser, then deploys it to a live URL.

MarsCode is a browser-based cloud IDE with a built-in AI assistant for completion, explanation, and debugging.

RTL to FPGA prototype in minutes

Open-source Python library that constrains LLM decoding with finite-state machines so Pydantic, JSON Schema, regex, and grammar outputs come out valid every

Open-source AI pair programming in your terminal, with Git-native commits and whole-codebase awareness.

Open-source desktop workspace that runs Claude Code, Codex, OpenClaw, and other CLI coding agents side by side with per-task model routing.

Browser-based cloud IDE with real-time collaboration and one-click hosting

Document-aware AI editing SDK that lets your AI agents patch rich-text documents in place instead of dumping text into a chat window.

Google's open-source framework for building AI-powered and agentic apps in TypeScript, Go, Python, and Dart.

Open-source Go SDK giving one unified API across 25+ LLM providers with streaming, typed structured output, and MCP support.

Open-source Python RAG framework that turns your PDFs, Notion pages, and websites into a queryable AI app in a few lines of code.

Mirascope is an open-source Python library that turns LLM calls, tools, and prompt versioning into plain decorated functions.

Open-source AI coding agent for VS Code and JetBrains, acquired by Cursor in January 2026 and now an unmaintained codebase you fork, not subscribe to.

Devin Desktop (formerly Windsurf) is an agent-native IDE for running fleets of local and cloud coding agents from one Sessions board.

Open platform for running fleets of cloud coding agents across your SDLC, with an agentic terminal and a CLI agent that works anywhere

ReadMe is an API documentation platform that turns OpenAPI specs into interactive references, syncs docs with GitHub and GitLab, and uses AI to lint, review,

Open-source autonomous AI coding agent that plans, executes, and deploys tasks inside VS Code and JetBrains IDEs.