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Bazel vs Buck2: catalog facts
Bazel	Buck2
Free Free and open source.	Free Free and open source.
Windows, macOS, Linux, Command line	Windows, macOS, Linux, Command line
Rebuilds only what changed, with local and distributed caching One tool for many languages and platforms	Hermetic builds by default Extensible rules written in Starlark
Build files and rules take time to learn Adds overhead that small single-language projects may not need	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
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 October 1, 2026

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