The system font for macOS, iOS, watchOS, and tvOS.
TextKit and Font Specifications
Learn about using the TextKit API for text handling and typesetting capabilities in your iOS app. Download tools to work with font files and look up font format specifications.
This text engine and API in iOS provides sophisticated text handling and typesetting capabilities for managing adaptive user interfaces.
Apple Font Tool Suite
A suite of command line tools that include an installer package, tutorial, user documentation, and reference.
TrueType and AAT
Specifications for the TrueType Font Format. Apple Advanced Typography (AAT) Font Feature Registry for advanced font rendering.