iOS 12 — Apple's twelfth-generation mobile operating system

iOS 12 is the twelfth major release of Apple's iPhone and iPad operating system, emphasizing performance, stability, new privacy and productivity features, and developer tools for augmented reality and automation.

Overview

iOS 12 is the twelfth major version of Apple's mobile operating system for iPhone and iPad. It was announced at WWDC 2018 and released to the public in September 2018. The release prioritized speed and stability, particularly on older devices, while adding consumer-facing features and developer frameworks that extended augmented reality and automation capabilities.

Key features

Rather than a radical redesign, iOS 12 focused on refinements and new tools. Notable additions included:

Performance improvements: System-wide optimizations to make apps launch faster and improve responsiveness on older hardware.
Screen Time: A set of digital wellbeing tools that track and limit device and app usage.
Siri Shortcuts: A new workflow-style automation interface allowing users and apps to create multi-step actions triggered by Siri.
ARKit 2 and USDZ support: Enhanced augmented reality APIs for shared experiences and a portable AR file format for easier content exchange.
Notifications and communication: Grouped notifications and expanded personalization such as additional Animoji and Memoji options.

Performance, compatibility and platform focus

Apple designed iOS 12 to run on the same device lineup supported by iOS 11, with particular attention to improving the experience on older models. The update emphasized reliability and battery behavior alongside security and privacy enhancements. Developers were encouraged to adopt the new APIs while maintaining backward compatibility for users on a wide range of hardware.

History and release

The update was developed and previewed at developer sessions and public betas following the announcement. Apple, the platform vendor, coordinated developer documentation and toolchains to help migrate apps; more information and technical guides were published by Apple. Public availability began in September 2018 and the release cycle continued with incremental updates to fix bugs and add small features.

Impact, uses and notable distinctions

iOS 12 is remembered for returning emphasis to performance and user experience rather than visual overhaul. The introduction of Screen Time marked a broader industry move toward digital health controls. The combination of Siri Shortcuts and ARKit 2 opened new patterns for automation and immersive apps on the platform. Some features announced at launch, such as advanced group video calling, were refined and delivered in later point releases.