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s2n-tls

v0.3.37 Growing

A C99 implementation of the TLS/SSL protocols

Apache-2.0 Edition 2021 MSRV 1.84

Quick Verdict

  • โœ“Actively maintained (updated 5d ago)
  • !Pre-1.0: API may have breaking changes
  • โœ“Trusted by 287 crates
  • โœ“Team maintained (3 owners)
  • โœ“Permissive license (Apache-2.0)

Security

Checking security advisories...
Downloads
8.0M
Dependents
287
Releases
98
Size
92KB

Deep Insights

๐Ÿ“Š
Steady growth

584.8K downloads in the last 30 days (19.5K/day), up 2% from the previous period.

๐Ÿ”—
Moderate adoption

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

๐Ÿ‘ค
Prolific maintainer

The primary maintainer publishes 51 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
19K/day avg-8%
05K10K15K20K2/263/164/34/215/95/26

Top Dependents

Version Adoption

v0.3.36
41%
v0.3.34
23%
v0.3.35
20%
v0.3.28
10%
v0.3.29
6%

Release Timeline

10 releasessince 2025
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2025
5
2026
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Feature Flags

pqfipsquicunstable-crlunstable-ktlsunstable-eventsunstable-testingunstable-fingerprintunstable-renegotiateunstable-cert_authoritiesunstable-custom_x509_extensions

README

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Maintainers

Dependencies
11
direct dependencies
Dependents
287
crates depend on s2n-tls