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bitflying/swift-nio

SwiftNIO is a low-level, high-performance networking library for Swift that provides a comprehensive toolkit for building networked applications. It offers a full-featured HTTP/1.1 and WebSocket implementation, along with utilities for TLS negotiation, concurrency, and memory management. The system includes a robust test suite that validates functional correctness, performance benchmarks, and memory allocation stability across multiple platforms.

46.2

Weak · 31 July 2026

37k

lines of production code

Swift

primary language

2

bus factor · 125 authors in all

3

measurements over time

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How it got here

2017 · HTTP/1.1 and TLS support

This period focused on implementing core HTTP/1.1 protocol handling and TLS capabilities, including new channel handlers, server examples, and dynamic pipeline configuration. The work also established foundational concurrency primitives and expanded test coverage across Linux and Windows platforms.

16 changes

2018 · Platform support and testing infrastructure

This period focused on expanding cross-platform compatibility by introducing Darwin and Linux-specific C shims for system calls, alongside adding Foundation integration for ByteBuffer operations. The team also established a robust testing and performance benchmarking infrastructure, including allocation counting and integration tests for HTTP and WebSocket protocols.

16 changes

2019–2020 · Test infrastructure and Windows support

This period focused on expanding test coverage and tooling, introducing a new allocation counter framework and utilities for validating decoder and event behaviors. It also added Windows-specific CNIOWindows support and a crash tester utility to ensure robust error handling and cross-platform compatibility.

12 changes

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About this page

  • The description of this project is derived from its own commit history, not from its README.
  • The score is its highest published measurement, taken on 31 July 2026 at a pinned commit. It is not a live figure and does not change until the project is measured again.
  • Measured at commit 4853e910e8 — the exact code this score is about.
  • Scored under rubric rubric-2026.08.18. Score the same commit under that rubric and you get the same number.
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