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Theia IDE vs VSCodium: catalog facts
Theia IDE	VSCodium
Free Free and open source.	Free Free and open source under the MIT licence.
Windows, macOS, Linux, Web	Windows, macOS, Linux
Runs VS Code extensions from Open VSX Available on desktop and online	The same editor as VS Code, built from the same MIT-licensed source without Microsoft branding Telemetry is disabled in the default configuration
Uses Open VSX rather than the Microsoft extension marketplace Smaller user community than VS Code	Extensions come from Open VSX, so a few marketplace-only extensions are missing Microsoft’s proprietary extensions, including the C# debugger and Remote Development, are not licensed for it
Downloadable app, Web application	Downloadable app
Open source	Open source
License not stated	License: MIT
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 20, 2026

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