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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 399 entries on Flocci AI Tools with no upgrade path built in.

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?

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

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Eclipse Theia IDE alternatives

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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
Visit

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