Swift Language

Swift Package Index now supports Swift 6.4 and uses it to generate documentation 📦 Package authors, check that your packages work with the move to Swift Build:

RT @hishnash: I’ve been working on some performance-critical Swift code, and you can get some amazing speedups using spans, BitwiseCopyable types, explicit non-copyable structs, and atomics from the Synchronization module. That’s over a 400x speedup compared with Swift collection types and traditional kernel-based locking.

Swift 6.4.1 is out now! ⚙️ This maintenance release improves compiler stability, enhances dependency resolution in Swift Package Manager, and includes fixes for Foundation and Swift Testing. More here:

🗞️ Swift 6.4 landed in September, with Swift Build as the default in SwiftPM, Subprocess 1.0, and more capable Embedded Swift. Plus Vapor turns 10 and Google releases official Google Cloud client libraries for Swift. Read the latest digest:

Google: “[Swift] has matured into a viable systems and cloud language, pairing Rust-like data-race safety with predictable, reference-counted performance.” Announcing their Swift-based cloud SDK for backend services:

Updates to swift-crypto that offer an expanded cross-platform feature set for apps relying on cryptography:

Swift 6.4 is out! 🎉 This release brings deeper interoperability, stronger platform support, and easier everyday code. Highlights in this thread 🧵

✨ Simpler syntax for optionals like “some” and “any” 🛠️ Swift Build now the default in SwiftPM — same build on Linux/macOS/Windows 📦 Subprocess reaches 1.0 🌐 Wasm bridging via JavaScriptKit up to 40x faster 🔗 C++20 std::span interoperability 🔒 Faster code, still memory-safe

How does the debugger know exactly which Swift module your code came from? The upcoming Swift 6.4 release makes it more precise than ever, tracking the module path in debug info instead of looking it up by name, for faster and more reliable debugging.

Lots of cross-platform Swift news this month. ElementaryUI brings Swift to the web, SwiftTUI brings state and animations to the terminal, and Swift on Windows keeps getting better. Read more in our latest digest:

At last: a unified home for Swift documentation, pulling together the language reference, core libraries and tooling, and platform specifics into a single central home, no matter what you're building! Check it out and give us feedback:

Circleback didn't port an app to Swift, instead using it as a portable systems layer that provides the connective tissue between an Electron UI and some underlying platform dependencies (ScreenCaptureKit on macOS, libobs on Windows). Interesting approach:

Embedded Swift is a subset of Swift built for tiny, constrained hardware, with far smaller binaries while keeping the language you already know. Swift 6.4 brings it closer to full Swift than ever, supporting "any" types, untyped throws, and metatypes.

What's the difference between a package index and a package registry? One helps you discover packages, the other hosts and serves them. 📦 A new post explains how they fit together. Read more:

A busy summer for Swift continues. ☀️ In July: • Task Stealers land in Swift Concurrency’s runtime. • SwiftPM gets a package registry reference implementation. • A talk about explicit ownership at PLDI 2026. Read more:

June was a big month for Swift: previews of Swift 6.4, Swift Package Index joining Apple, and a community project that brought Swift to a 1977 Apple II. Read more in our latest digest:

Swift 6.3.3 is out now! 🔩 This maintenance release improves stability in the Swift REPL, concurrency, and key paths. More here:

Swift Package Index has become an essential part of the Swift ecosystem, and joining Apple strengthens it as it continues its mission. Learn more:

Memory-safe. 13% faster on average. ⚡️ The TrueType hinting interpreter in macOS and iOS has been rewritten in Swift, replacing the original C implementation. Pixel-perfect accuracy was validated across 27 million glyphs. And the results:

A unified networking stack for Swift, layered from low-level I/O primitives, through common protocols, to a modern HTTP client and server API. ⚙️ That's what the new Networking workgroup is building. Interested in contributing? Join us: