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Buck2 vs Gradle: catalog facts
Buck2	Gradle
Best for: Teams with large multi-language monorepos	Best for: Java, Kotlin and Android developers who need a scriptable build system
Free Free and open source.	Free The build tool is free and open source; an optional paid Security Subscription adds extended security maintenance.
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	Build scripts in Kotlin or Groovy DSLs Build caching and parallel execution for faster incremental builds All 4 strengths for Gradle Build scripts in Kotlin or Groovy DSLs Build caching and parallel execution for faster incremental builds Large plugin ecosystem Migration guides from Maven and Ant
Designed for large monorepos and may be heavy for small projects Learning curve for BUCK files and Starlark rules	Build logic can become complex on large projects Extended security maintenance beyond end of life requires a paid subscription
Downloadable app	Downloadable app
Open source	Open source
License: MIT OR Apache-2.0	License: Apache-2.0
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 Gradle gradle.org Catalog checked September 23, 2026

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