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s2n-tls

v0.3.40 Growing

A C99 implementation of the TLS/SSL protocols

Apache-2.0 Edition 2021 MSRV 1.91

Quick Verdict

  • โœ“Actively maintained (updated 3d ago)
  • !Pre-1.0: API may have breaking changes
  • โœ“Trusted by 304 crates
  • โœ“Team maintained (3 owners)
  • โœ“Permissive license (Apache-2.0)

Security

Checking security advisories...
Downloads
8.6M
Dependents
304
Releases
101
Size
96KB

Deep Insights

๐Ÿ“‰
Download decline

266.3K downloads in the last 30 days, down 56% from the previous period. May indicate migration to alternatives.

๐Ÿ”—
Moderate adoption

304 crates depend on s2n-tls. Reasonable ecosystem adoption, though not yet a core dependency.

๐Ÿ‘ค
Prolific maintainer

The primary maintainer publishes 56 crates. This suggests deep Rust expertise and long-term commitment to the ecosystem.

๐Ÿ”ฌ
Pre-1.0 for over a year

Despite being 5+ years old, s2n-tls hasn't reached 1.0 yet. Expect potential API changes between versions.

๐ŸŒŸ
Used by top crates

Notable dependents include aws-smithy-http-client, s2n-tls-tokio, s2n-quic-tls, s2n-tls-hyper, brass-aphid-wire-messages. When high-quality crates choose s2n-tls, it's a strong quality signal.

Health Breakdown

Maintenance 19/25

Recency, release consistency, active ratio

Quality 16/25

Yanked ratio, deps, size, maturity, features

Community 13/20

Reverse deps, ownership, ecosystem

Popularity 8/15

Downloads, momentum, growth trend

Documentation 12/15

Docs, repo, license, metadata

Download Trend

Daily downloads ยท last 90 days
14K/day avg-90%
05K10K15K20K25K4/275/156/26/207/87/25

Top Dependents

Version Adoption

v0.3.36
39%
v0.3.34
19%
v0.3.35
17%
v0.3.37
17%
v0.3.39
8%

Release Timeline

10 releasessince 2025
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2025
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2026
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Feature Flags

default =["init"]

pqfipsinit*quicunstable-crlunstable-ktlsunstable-eventsunstable-testingunstable-fingerprintunstable-renegotiateunstable-cert_authoritiesunstable-custom_x509_extensions

README

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Maintainers

Dependencies
11
direct dependencies
Dependents
304
crates depend on s2n-tls