Crate

rustls

Modern TLS implementation in pure Rust — no C code.

What it is

rustls is a TLS 1.2 and 1.3 implementation written entirely in Rust. It handles certificate verification, mutual authentication, and session resumption. It integrates with tokio via tokio-rustls and replaces OpenSSL-based TLS in the Rust ecosystem.

Why it is commonly used

Used in security-conscious applications and where OpenSSL is undesirable — embedded systems, WebAssembly targets, and production services that require memory-safe TLS without C library dependencies or OpenSSL version management.

769
Repositories
92%
Actively maintained
691
Updated ≤ 30 days
2.8M
Total stars
695
Owners

Counted from the Cargo.toml manifests of the 769 indexed repositories that declare rustls as a dependency — not download counts. Dependency data last verified 2026-09-23.

Browse 769 repositories using rustls in Repos →
Often used with

Crates that show up unusually often in rustls projects. The most distinctive pairings rank first — crates these projects use far more than the average indexed Rust project does, not just crates that are popular everywhere. Each percentage is the share of rustls projects that also use it.

Used by these organizations
50 of 769 repositories · ranked by stars · 691 pushed in the last 30 days
hyperswitch★ 44kactive

Open source, composable payments platform | PCI compliant | SaaS and Self-host options | Enables connectivity to multiple payment, payout, fraud, vault and tokenization providers | Uplifts authorization with intelligent routing and revenue recovery | Reduce payment processing costs with cost observability | Reduces payment ops with reconciliation

servo★ 38kactive

Servo aims to empower developers with a lightweight, high-performance alternative for embedding web technologies in applications.

⑂ 3.8k◎ 3.2k
qdrant★ 35kactive

Qdrant - High-performance, massive-scale Vector Database and Vector Search Engine for the next generation of AI. Also available in the cloud https://cloud.qdrant.io/

rustfs★ 33kactive

🚀2.3x faster than MinIO for 4KB object payloads. RustFS is an open-source, S3-compatible high-performance object storage system supporting migration and coexistence with other S3-compatible platforms such as MinIO and Ceph.

neon★ 23kactive

Neon: Serverless Postgres. We separated storage and compute to offer autoscaling, code-like database branching, and scale to zero.

⑂ 1.1k◎ 562
windmill★ 18kactive

Open-source developer platform to power your entire infra and turn scripts into webhooks, workflows and UIs. Fastest workflow engine (13x vs Airflow). Open-source alternative to Retool and Temporal.

sqlx★ 17kactive

🧰 The Rust SQL Toolkit. An async, pure Rust SQL crate featuring compile-time checked queries without a DSL. Supports PostgreSQL, MySQL, and SQLite.

stalwart★ 15kactive

All-in-one Mail & Collaboration server. Secure, scalable and fluent in every protocol (IMAP, JMAP, SMTP, CalDAV, CardDAV, WebDAV).

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