Apple Details watchOS 27 RC Release Notes Featuring Siri Modular Face and Smart Stack Updates
Apple has revealed the Release Candidate (RC) update notes for watchOS 27, featuring upgraded Siri AI features, a standalone Siri app, and the new Siri Modular watch face. The release also adds Apple Intelligence capabilities such as Workout Buddy, enhanced Smart Stack gestures, and perimenopause tracking for older users. The update deepens Apple Intelligence integration on wearables, allowing users to access context-driven information and hands-free controls directly from their wrist. It underscores Apple's broader push to bring conversational AI, expanded health insights, and refined system usability to Apple Watch. The new Siri Modular watch face features a rectangular complication that mirrors the top widget of the Smart Stack, while Smart Stack now supports a single-handed double-pinch gesture for navigation. Other technical enhancements include offline Shazam song recognition, dynamic app grid reordering, treadmill distance accuracy improvements, and perimenopause cycle deviation alerts for users aged 40 and above.
## BACKGROUND
watchOS is the operating system powering the Apple Watch, offering customizable watch faces and the Smart Stack interface that organizes widgets based on time, location, and activity. Apple Intelligence represents Apple's suite of generative AI tools that run across iOS and watchOS to deliver context-aware features and personalized assistance.