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Atheos vs Theia IDE: catalog facts
Atheos	Theia IDE
Free Free and open source.	Free Free and open source.
Web, Self-hosted	Windows, macOS, Linux, Web
Runs on a basic PHP and Apache server with no database Multi-user with real-time collaborative editing	Runs VS Code extensions from Open VSX Available on desktop and online
Mainly developed and tested on a Debian LAMP stack Much lighter feature set than desktop IDEs	Uses Open VSX rather than the Microsoft extension marketplace Smaller user community than VS Code
Self-hosted	Downloadable app, Web application
Open source	Open source
License: MIT	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 23, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.