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KDevelop vs Theia IDE: catalog facts
KDevelop	Theia IDE
Free Free and open source.	Free Free and open source.
Windows, macOS, Linux	Windows, macOS, Linux, Web
Semantic code completion for C and C++ CMake and QMake project support	Runs VS Code extensions from Open VSX Available on desktop and online
Python and PHP support needs optional plugins Best suited to C, C++ and Qt work	Uses Open VSX rather than the Microsoft extension marketplace Smaller user community than VS Code
Downloadable app	Downloadable app, Web application
Open source	Open source
License not stated	License not stated
No account needed	Not stated if an account is needed
Works offline	Not stated if it 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.