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Buck2 vs Qbs: catalog facts
Buck2	Qbs
Best for: Teams with large multi-language monorepos	Best for: C++ and Qt developers who want a declarative alternative to CMake or qmake
Free Free and open source.	Free Free and open source, maintained by the community.
Windows, macOS, Linux, Command line	Windows, macOS, Linux, Command line
Hermetic builds by default Extensible rules written in Starlark All 3 strengths for Buck2 Hermetic builds by default Extensible rules written in Starlark Supports many languages in one build graph	Declarative project description Integrates with Qt Creator All 3 strengths for Qbs Declarative project description Integrates with Qt Creator Community maintained and open source
Designed for large monorepos and may be heavy for small projects Learning curve for BUCK files and Starlark rules	Qt itself has moved to CMake for official builds Binaries come mainly bundled with Qt Creator and the Qt SDK All 3 limitations for Qbs Qt itself has moved to CMake for official builds Binaries come mainly bundled with Qt Creator and the Qt SDK Smaller user base than CMake
Downloadable app	Downloadable app
Open source	Open source
License: MIT OR Apache-2.0	License not stated
No account needed	No account needed
Offline features available	Offline features available
Official website Full listing and sources Sources for Buck2 buck2.build Catalog checked October 1, 2026	Official website Full listing and sources Sources for Qbs wiki.qt.io/Qbs Catalog checked October 1, 2026

“Not stated” means we have not confirmed it. Features can vary by device and plan.