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Theia IDE vs KDevelop: catalog facts
Theia IDE	KDevelop
Free Free and open source.	Free Free and open source.
Windows, macOS, Linux, Web	Windows, macOS, Linux
Runs VS Code extensions from Open VSX Available on desktop and online	Semantic code completion for C and C++ CMake and QMake project support
Uses Open VSX rather than the Microsoft extension marketplace Smaller user community than VS Code	Python and PHP support needs optional plugins Best suited to C, C++ and Qt work
Downloadable app, Web application	Downloadable app
Open source	Open source
License not stated	License not stated
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 23, 2026

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