Swift is designed to be the language you reach for at every layer of the software stack. Whether you’re building embedded firmware, internet-scale services, or full-featured mobile apps, Swift delivers strong safety guarantees, performance control when you need it, and expressive language features and APIs.

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Swift 6.3 has been officially released with several notable improvements. Key highlights include a new @c attribute for exposing Swift functions and enums to C code, module name selectors for disambiguating APIs from multiple imported modules, and new performance control attributes for library authors (@specialize, @inline(always), @export(implementation)). The release also previews Swift Build integrated into Swift Package Manager for a unified cross-platform build engine. Swift Testing gains warning-level issues, test cancellation, and image attachments. DocC receives experimental Markdown output, per-page static HTML, and code block annotations. Embedded Swift sees broad improvements in C interoperability and debugging. Most significantly, Swift 6.3 ships the first official Swift SDK for Android, enabling native Android development in Swift and integration with existing Kotlin/Java apps via Swift Java and Swift Java JNI Core.

Swift 6.3 Released