facebook/folly

Health v2 · maintenance only

Adoption not part of the score

30552 stars · 5883 forks observed · 2026-10-18

What it is AI-extracted, prompt v1, taxonomy v1, 2026-10-05, confidence 0.98

Folly is a C++20 library of core components designed for practicality and efficiency. It provides a wide range of utilities, from concurrency primitives to data structures, used extensively at Facebook.

Use cases

• need high‑performance C++ utilities for server‑side development
• replace Boost components with a more modern, Facebook‑maintained library
• build scalable asynchronous systems in C++
• require efficient data structures and algorithms for performance‑critical code
• need ready‑made logging, serialization, and caching helpers in C++

When to choose

• When you need a mature, actively maintained C++ library with a focus on performance
• If your project targets C++20 and can benefit from Facebook’s production‑grade components
• When you want a comprehensive set of utilities without pulling in many separate dependencies

When to avoid

• If you prefer a minimal footprint or only need a few simple utilities
• When your codebase is limited to older C++ standards (pre‑C++20)
• If you require strict adherence to the C++ standard library without external extensions

Facets

library · maturity active

concurrency networking serialization logging testing caching parser developer-tools backend performance windows cross-platform cpp c++20 high-performance boost-alternative utility-components facebook-internal container algorithm linux macos

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