Buck2

Buck2 is ranked #6 of 40 in build automation software on The Geeks Club. It runs on Linux, macOS, Self-hosted, Windows. There is a free plan.

Buck2 plans and pricing

Open source Free Buck2 build system · source and binaries available under MIT and Apache-2.0 licenses github.com · 30 Sept 2026

Compared on build automation software

Free plan: Yes
Build as code: Yes
Build caching: Yes
Remote execution: Yes
Artifact packaging: Yes
Supported operating systems: multi-platform

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Buck2

Purpose: Buck2 is a large-scale, fast, hermetic, multi-language build system and the successor to Buck.
Features: Buck2 uses Starlark rules, a dynamic dependency graph, and incremental actions to support extensible builds.
Integrations: The project says BuildBarn, BuildBuddy, EngFlow, and NativeLink work with its distributed compilation support through the Bazel Remote Execution API.
Languages: The language support table lists C/C++, Erlang, Go, Haskell, Java, Kotlin, OCaml, Python, and Rust with available prelude rules; support usability varies by language.
Platforms: The installation guide documents building from source on Linux, macOS, and Windows, and notes prebuilt protoc support on those systems.
Large repositories: Buck2 supports filesystem watching and can integrate with Meta's Eden virtual filesystem, though Eden is optional.
Security and correctness: Buck2 rules are hermetic by default and missing dependencies are errors; local-only build steps are not sandboxed, while remote execution is hermetic by design.
Maturity: The project describes Buck2 as early-stage and warns that outside users may encounter rough edges, missing features, and missing toolchains.
Release status: The repository says Buck2 does not yet have a stable release tag and that its latest binary tag updates on every repository push.
Support: The project directs users to report issues through GitHub and provides a community Discord server.
Audience: Buck2 is designed for large-scale, multi-language repositories and supports composing targets across languages in one build.
Maker: Buck2 is a build system from Meta and the repository says it was designed by Meta.
Price from: Free

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Where it ranks on The Geeks Club

Best Build Automation Software in 2026#6 of 40
Best Game Build Automation Software in 2026#21 of 40
Best Monorepo Management Tools in 2026#11 of 33

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Sources

buck2.build· checked 30 Sept 2026
buck2.build/docs/about/why/· checked 30 Sept 2026
github.com/facebook/buck2· checked 30 Sept 2026
buck2.build/docs/about/language_support/· checked 30 Sept 2026
buck2.build/docs/getting_started/install/· checked 30 Sept 2026