Swift 6.3

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.

Swift 6.3 makes these benefits more accessible across the stack. This release expands Swift into new domains and improves developer ergonomics across the board, featuring:

More flexible C interoperability

Improvements to cross-platform build tooling

Improvements for using Swift in embedded environments

An official Swift SDK for Android

Read on for an overview of the changes and next steps to get started.

Language and Standard Library

C interoperability

Swift 6.3 introduces the @c attribute, which lets you expose Swift functions and enums to C code in your project. Annotating a function or enum with @c prompts Swift to include a corresponding declaration in the generated C header that you can include in your C/C++ files:

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