Theia IDE – AI-Native Open-Source Cloud and Desktop IDE

The Theia IDE is a modern, AI-native IDE for cloud and desktop built on the Theia Platform.
The Theia Platform is a framework for building custom, AI-native tools & IDEs.
Unlock limitless possibilities with Theia IDE's seamless compatibility with the VS Code extension ecosystem. From robust linting tools to interactive notebook editors, customize your development experience like never before. Explore more than 3000 available extensions for the Theia IDE at open-vsx.org!
Experience the future of development with the AI-native Theia IDE, the open alternative to Github Copilot, Cursor etc. Built on Theia AI, our AI-first approach offers unmatched transparency and control, allowing you to customize AI interactions, choose your preferred models—whether cloud-based, self-hosted, or local—tailor prompts to your workflow, and even create your own custom agents to automate individual workflows, all while maintaining full ownership of your data.
Theia IDE sends no telemetry on your code, prompts, or AI usage. Bring your own API key or subscription and connect to any AI provider—OpenAI, Anthropic, Google, or a fully self-hosted/local model—with no vendor lock-in and no proxy routing your requests through a third party. Your source code, prompts, and credentials stay under your control, making Theia IDE a strong fit for privacy-conscious teams and organizations with strict data sovereignty requirements.
Experience world-class code editing support in Theia IDE, integrated with the Language Server Protocol (LSP). Develop in almost any programming language, including Python, Java, JavaScript, C++, and more—all within one environment.
The Theia IDE is backed by a diverse and healthy open source ecosystem and is an open alternative to VS Code (not a fork), as well as the open alternative to closed AI coding assistants. Enjoy the added confidence of a fully open-source platform governed by a vendor-neutral community. Deploy and enrich your toolset on your own terms. See how Theia IDE compares to other AI coding tools.
Elevate your development workflow with Theia IDE's flexible workbench layout and user experience. Featuring theming support, a dynamic toolbar, detachable views, and efficient tab management, our web-based interface is designed to adapt to your needs, streamlining your projects for optimal productivity.
The Theia IDE is built upon the highly modular Theia platform, enabling the integration of custom extensions and the creation of fully tailored tools (see examples below). Explore the Theia Platform and learn how to create custom tool offerings with ease!
While Theia incorporates certain components from Visual Studio Code, such as the Monaco editor, it is independently developed with a unique, modular architecture and is NOT a fork of VS Code (learn why).
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