Announcing Swift 6

Many people know of Swift as a language for app development, with a million apps on the App Store. But Swift is great for more than just apps. Swift’s safety, speed, and approachability make it a great choice for many other use cases including libraries, internet-scale services, and the most performance-critical and secure code.

Swift 6 scales even further through new low-level programming features, an embedded Swift language subset, expanded Linux and Windows support, new cross-platform APIs including the new Swift Testing library, and more.

→ swift.org/blog/announcing-swift-6/

Swift 6 is a major release expanding the language’s reach with full data-race safety via an opt-in language mode, typed throws for precise error handling, and non-copyable type support in generics for low-level performance.

It introduces Embedded Swift for microcontroller programming, 128-bit integers, and productivity features like pack iteration and access-controlled imports. The unified, open-source Foundation implementation enhances cross-platform consistency, while Swift Testing offers a new, macro-driven testing library.

Enhanced C++ interoperability, improved debugging with @DebugDescription, and better Linux/Windows support, including static SDKs and arm64 toolchains, further broaden Swift’s applicability across domains.