watchOS 27 introduces significant enhancements for Apple Watch, notably bringing Siri AI to the device. This includes a dedicated Siri app that syncs across Apple devices, offering enhanced understanding and capabilities. The update also features a dynamic app grid, accessed by pressing the Digital Crown, which presents Siri-suggested apps based on recency and popularity.

Workout Buddy receives three key improvements: it now functions independently of an iPhone, supports Spanish in addition to English, and provides more detailed insights into pace, distance, and duration. Health and Fitness tracking also sees advancements, with Cycle Tracking gaining perimenopause and menopause support, and indoor run/walk tracking becoming more accurate through improved motion algorithms.

A new double-tap gesture allows for interaction with app widgets in the Smart Stack, enabling actions like opening apps or controlling media without touching the screen. The Find My app is unified into a single application, mirroring its iPhone, iPad, and Mac counterparts, and gains Precision Finding support. Additionally, watchOS 27 introduces battery optimization suggestions and faster music playback, with the final version expected in September.