refraction-networking/utls

Health v2 · maintenance only

Adoption not part of the score

2539 stars · 362 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

uTLS is a fork of Go's crypto/tls library that provides low-level access to the TLS ClientHello message, enabling fingerprint mimicry and resistance to ClientHello-based blocking. It is widely used by anti-censorship tools to make Go's distinctive TLS handshake look like common browsers or other clients.

Use cases

• make my Go program's TLS handshake look like Chrome to avoid blocking
• customize ClientHello extensions and cipher suites in Go
• build a censorship-resistant proxy that isn't fingerprinted by its TLS
• randomize TLS fingerprints to defeat blacklists
• mimic browser TLS fingerprints in a Go client
• access and modify low-level TLS handshake fields

When to choose

• you need to disguise or randomize Go's TLS ClientHello fingerprint
• you're building anti-censorship or privacy tooling in Go
• you need low-level read/write access to TLS handshake messages

When to avoid

• you just need standard TLS connections without fingerprint concerns
• you're not working in Go
• you need a high-level HTTP client rather than TLS-level control

Facets

library · maturity active

cryptography security http-client networking security privacy censorship-circumvention networking developer-tools go cross-platform tls clienthello fingerprinting anti-censorship obfuscation parrot handshake crypto-tls-fork

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markdown · JSON · MCP: product_card(name="refraction-networking/utls")