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Qbs vs Buck2: catalog facts
Qbs	Buck2
Free Free and open source, maintained by the community.	Free Free and open source.
Windows, macOS, Linux, Command line	Windows, macOS, Linux, Command line
Declarative project description Integrates with Qt Creator	Hermetic builds by default Extensible rules written in Starlark
Qt itself has moved to CMake for official builds Binaries come mainly bundled with Qt Creator and the Qt SDK	Designed for large monorepos and may be heavy for small projects Learning curve for BUCK files and Starlark rules
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: MIT OR Apache-2.0
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 1, 2026

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