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Buck2 vs moon: catalog facts
Buck2	moon
Best for: Teams with large multi-language monorepos	Best for: Teams running a multi-language monorepo who want faster, reproducible builds
Free Free and open source.	Free Free and open source under the MIT licence.
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	Smart hashing and remote caching cut repeated build work Installs pinned versions of languages and tools per workspace All 4 strengths for moon Smart hashing and remote caching cut repeated build work Installs pinned versions of languages and tools per workspace Task inheritance avoids repeating the same task in every project Generates CODEOWNERS from declared ownership
Designed for large monorepos and may be heavy for small projects Learning curve for BUCK files and Starlark rules	Adds a layer of configuration that small single-project repositories may not need Most useful for teams managing many projects in one repository
Downloadable app	Downloadable app
Open source	Open source
License: MIT OR Apache-2.0	License: MIT
No account needed	No account needed
Offline features available	Not stated if it works offline
Official website Full listing and sources Sources for Buck2 buck2.build Catalog checked October 1, 2026	Official website Full listing and sources Sources for moon moonrepo.dev/moon Catalog checked October 2, 2026

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