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SCons vs Buck2: catalog facts
SCons	Buck2
Free Free and open source under the MIT licence.	Free Free and open source.
Windows, macOS, Linux, Command line	Windows, macOS, Linux, Command line
Build files are Python scripts Automatic dependency scanning for C, C++ and Fortran	Hermetic builds by default Extensible rules written in Starlark
Requires Python to run Less common than CMake or Make in many projects	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: MIT	License: MIT OR Apache-2.0
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 1, 2026

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