# aws/s2n-quic

An implementation of the IETF QUIC protocol

Repository: https://github.com/aws/s2n-quic
Canonical: https://ross.abutalabs.com/products/s2n-quic
Homepage: https://crates.io/crates/s2n-quic
Language: Rust
License: Apache-2.0
License Family: permissive
Topics: quic, rust, cryptography, s2n
Last push: 2026-08-26T18:04:51+00:00

## Health v2 (maintenance only)
Score: 99/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 98, longevity 100
- inputs: {"age_days": 2260, "days_push": 7, "days_rel": 12, "gap_med": 15, "n_releases_24m": 44}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1366, forks 183 (observed 2026-08-28T04:04:31.364675+00:00)

## What it is
s2n-quic is a Rust implementation of the IETF QUIC transport protocol, offering a simple API with configurable providers for TLS (s2n-tls or rustls), congestion control, and other features. It is developed by AWS with extensive automated testing including fuzzing, interoperability, and performance benchmarking.

## Use cases
- implement a QUIC server or client in Rust
- build low-latency transport for my application instead of TCP
- serve HTTP/3 traffic with a QUIC library
- use QUIC with s2n-tls or rustls for TLS
- test QUIC protocol compliance and interoperability

## When to choose
- you need a production-grade QUIC implementation in Rust with strong testing and AWS backing
- you want granular control via providers over TLS, congestion control, and pacing
- you need cross-platform QUIC support including Linux, macOS, and Windows

## When to avoid
- you need a full HTTP/3 stack rather than just the QUIC transport layer
- your project is not in Rust or cannot tolerate a C compiler/CMake build dependency for crypto on Linux
- you only need simple TCP/TLS networking without QUIC's features

## Facets
- artifact type: library
- maturity: active
- function: networking, cryptography, security
- domain: networking, security, developer-tools, web-development
- platform: rust, windows, cross-platform
- tags: quic, tls, s2n-tls, rustls, transport-protocol, http3, linux, macos

## Member repositories
- aws/s2n-quic (main) score 99

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:31.364675+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T04:41:11.639022+00:00, confidence not recorded.
  - readme: https://github.com/aws/s2n-quic (fetched 2026-08-28T04:04:31.364675+00:00, sha 118cd6794f63)
  - registry_crates: https://crates.io/api/v1/crates/s2n-quic (fetched 2026-08-29T11:58:21.047830+00:00, sha 5da81d6a4e3b)
- Data as of 2026-08-30T08:39:29.467469+00:00.