Eclipse Theia

Open-source, VS Code-compatible IDE and IDE framework for desktop and browser.

Open sourceSelf-hostableCode editors

Verified facts: 4 of 4
Alternatives ranked: 5
Approved reviews: 0
Visits sent from here: 1

About Eclipse Theia

Eclipse Theia is both an IDE and a framework for building IDEs, developed under the vendor-neutral Eclipse Foundation. The Theia IDE looks and works much like VS Code, runs as a desktop app or in the browser, and installs VS Code extensions from the Open VSX registry. Its AI features let you bring your own API key or subscription and connect any model, whether cloud, self-hosted or fully local, and the project says it sends no telemetry on your code, prompts or AI usage. The Theia Platform underneath is what many companies use to build their own branded or domain-specific tools, since it is more modular and licence-friendly than forking VS Code. Everything is free and open source; the platform is under the Eclipse Public License 2.0 and the IDE product under MIT. It is a good fit for organisations building custom tools and for people who want an open, telemetry-free VS Code-like editor, though its extension compatibility and polish trail VS Code itself.

Best for: Teams building custom IDEs and developers who want an open, telemetry-free VS Code-style editor.

What works

Open source and vendor-neutral under the Eclipse Foundation
Runs VS Code extensions from Open VSX
AI with any model, no telemetry on code or prompts

Why people leave

Some VS Code extensions don't work fully
Smaller user community than VS Code
Less polished as a day-to-day editor

Top Eclipse Theia alternatives

See all 5

1
VSCodium
A telemetry-free build of VS Code itself, for full extension compatibility.
81.5
2
Visual Studio Code
The editor Theia emulates, with the largest extension marketplace.
74.3
3
Zed
An open-source native editor with bring-your-own-model AI support.
69.0
4
GitHub Codespaces
Managed browser-based environments if you'd rather not host your own.
59.6
5
Eclipse IDE
The Eclipse Foundation's classic desktop IDE, still strong for Java and embedded.
57.2

Why people left Eclipse Theia

In reviewers' own words, from reviews of the apps they moved to. These are their opinions, not ours.

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Eclipse Theia: common questions

Is Eclipse Theia free?

Yes. Eclipse Theia is free, open-source software that you can host yourself.

Is Eclipse Theia open source?

Yes. The source code is on GitHub at eclipse-theia/theia. You can also run it on your own server.

What platforms does Eclipse Theia run on?

Eclipse Theia is available for Windows, macOS, Linux, Web and Self-hosted.

What are the best alternatives to Eclipse Theia?

The highest-ranked Eclipse Theia alternatives right now are VSCodium, Visual Studio Code and Zed. See the full ranked list for pricing, platforms and verified facts.

See all 5 Eclipse Theia alternatives

Eclipse Theia facts

4 of 4 verified

License (platform): EPL-2.0; Checked Oct 25, 2026github.com(opens source in a new tab); “License: EPL-2.0 (Eclipse Public License 2.0).”
Telemetry: None on code, prompts or AI usage; Checked Oct 25, 2026theia-ide.org(opens source in a new tab); “Full Freedom of Choice — Your Keys, Your Data, Your Rules Theia IDE sends no telemetry on your code, prompts, or AI usage.”
AI models: Any: cloud, self-hosted or local; Checked Oct 25, 2026theia-ide.org(opens source in a new tab); “Bring your own API key or subscription and connect any model — cloud, self-hosted, or fully local — with no vendor lock-in and no telemetry on your code or prompts.”
Extensions: 3,000+ on Open VSX; Checked Oct 25, 2026theia-ide.org(opens source in a new tab); “Explore more than 3000 available extensions for the Theia IDE at open-vsx.org!”