Theia IDE
Vendor-neutral open-source IDE with Theia AI: agents, chat and completion with any LLM provider, no telemetry.
- License
- EPL-2.0
- Platforms
- Windows, macOS, Linux
- Own API keys
- Yes
- Checked
- 2026-09-24
Theia IDE works with OpenAI-compatible APIs. Grab a free key and a model from the catalog: for coding · for agents · providers and base URLs
Theia IDE alternatives
Microsoft's open-source editor with built-in GitHub Copilot chat, agent mode and inline suggestions; also supports your own model keys.
AI-first fork of VS Code with agent mode, Tab autocomplete, codebase indexing and multi-model chat.
The Windsurf IDE, renamed by Cognition in June 2026: VS Code-based editor with Devin agents, Tab autocomplete and ACP support.
ByteDance's VS Code-based AI IDE with chat, agent and SOLO modes, autocomplete and MCP support.
Fast open-source Rust editor with an agent panel, edit predictions and ACP support for external agents like Claude Agent and Codex.
AWS agentic IDE built around spec-driven development: prompts become requirements, design and tasks, with hooks and parallel agents.
FAQ
Is Theia IDE free?
Completely free and open source with no bundled AI quota: connect your own keys or local models via Ollama.
Does Theia IDE work with free models?
Yes. It supports your own keys and OpenAI-compatible APIs, so you can plug in free models from OpenRouter, Groq, NVIDIA Build, or a local Ollama.
What license does Theia IDE use?
EPL-2.0. The source code is open.