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Eclipse Theia IDE

Open-source, vendor-neutral IDE with AI agents built on Theia AI

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What Eclipse Theia IDE does

  • Open-source, vendor-neutral IDE with AI agents built on Theia AI
  • Bring your own API key or local model; no telemetry on code or prompts
  • Customisable agents and prompts, governed by the Eclipse Foundation

Eclipse Theia IDE — straight answers

What is Eclipse Theia IDE?

Eclipse Theia IDE is listed under AI IDEs & Editors, in the Code & Development category on Flocci AI Tools. Open-source, vendor-neutral IDE with AI agents built on Theia AI. It is free, with no paid plan attached, and it lives at theia-ide.org.

Is Eclipse Theia IDE free?

Eclipse Theia IDE is listed as fully free — there is no paid tier attached to it in the catalog. That makes it one of the 397 entries on Flocci AI Tools with no upgrade path built in.

Can I use Eclipse Theia IDE in a browser, or is there an app?

Eclipse Theia IDE works in a normal browser tab with no install. It is available on Windows, Linux, Mac, self-hosting and the web.

What can Eclipse Theia IDE do?

Eclipse Theia IDE does 3 things the catalog singles out: Open-source, vendor-neutral ide with ai agents built on theia ai; bring your own api key or local model; no telemetry on code or prompts; customisable agents and prompts, governed by the eclipse foundation.

What is the best free alternative to Eclipse Theia IDE?

Kiro is the closest free alternative: it sits in the same AI IDEs & Editors sub-category and is free tier + paid plans. CodeBuddy (Tencent), Cursor and Google Antigravity also start free. The full list is on the alternatives page.

See the full list →

Eclipse Theia IDE alternatives

Compare all alternatives →

Cursor

AI IDEs & Editors
freemium
  • AI-first VS Code fork with agent mode
  • Multi-file edits and terminal commands
  • Codebase-wide context and rules
  • Free tier with limited requests
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Google Antigravity

AI IDEs & Editors
freemium
  • Google's agent-first IDE
  • Powered by Gemini 3 models
  • Autonomous multi-step coding
  • Free access tier
Visit

Windsurf

AI IDEs & Editors
freemium
  • Agentic IDE with the Cascade flow
  • Now part of Cognition (Devin)
  • Deep whole-repo awareness
  • Free tier available
Visit

Zed

AI IDEs & Editors
freemium
  • Blazing-fast, Rust-built editor
  • Agentic editing and prediction
  • Real-time collaboration
  • Free and open-source core
Visit

Kiro

AI IDEs & Editors
freemium
  • AWS's spec-driven agentic IDE
  • Turns requirements into plans and code
  • Hooks and steering files
  • Free tier
Visit

Trae

AI IDEs & Editors
freemium
  • ByteDance's free AI IDE
  • SOLO agent builder mode
  • Access to frontier models
  • Generous free usage
Visit

Head-to-head comparisons

Eclipse Theia IDE vs CursorEclipse Theia IDE vs Google AntigravityEclipse Theia IDE vs WindsurfEclipse Theia IDE vs ZedEclipse Theia IDE vs KiroEclipse Theia IDE vs Trae