watchOS 4.0 (15R372) for Apple Watch Series 1 (38mm)

---

watchOS 4.0 Release Notes

Please note, the documentation below is supplied from Apple's update servers. We don't modify the contents of this documentation.

Watch Faces

• New Siri face that intelligently updates information based on time of day, location, and daily routines
• New animated Toy Story faces featuring Woody, Buzz Lightyear, Jessie and more
• New Kaleidoscope face that turns static images into symmetrical, intertwining patterns
• New complications for Siri, News, Heart Rate, Now Playing, and Messages

Activity

• Intelligent and personalized notifications to help you close your Activity rings each day
• Monthly challenges based on the previous month’s activity levels
• New full screen animations to celebrate important milestones including earning an achievement and closing your rings
• Replies to activity sharing notifications now include workout metrics

Workout

• Redesigned app for quick starts and helpful workout type graphics
• New High Intensity Interval Training (HIIT) workout with custom motion and heart rate algorithms for more accurate calorie tracking
• Support for multiple workout types in one workout session
• Auto sets for Pool Swim workouts with distance for each stroke type and pace for each set, automatically adjusted for rest time
• Ability to automatically start a synced music playlist when you start a workout on Apple Watch Series 1 and later
• Access to music controls directly in the Workout app during a workout session
• Option for Do Not Disturb to be automatically turned on during workouts

Heart Rate

• New visual graph showing all-day heart rate
• New heart rate measurements and visual graphs for resting rate (Apple Watch Series 1 and later), walking average, workout average and high, recovery time, and sessions in the Breathe app
• Option to be notified if your heart rate rises above a specified threshold while you appeared to be inactive for a 10-minute period
• Current and historical details of heart rate data in the Health app on iPhone, including new Heart Rate Variability (HRV) and VO2 Max data types

Music

• Redesigned app for easy scrolling through album art
• Ability to sync multiple playlists for local playback with bluetooth headphones
• Automatically sync curated playlists from Apple Music including Heavy Rotation, My New Music Mix, and My Favorites Mix

Other features and improvements

• News app with summaries of Top Stories and save for later to read on iPhone
• Flashlight and Safety Light in Control Center
• Vertical scrolling through recently used apps in the Dock
• App home screen available in an alphabetical list view
• Mail compose and swipe gestures
• Dialer pad in the Phone app
• Conflicts displayed in Calendar invites
• Scribble support for German
• Sub-minute and repeating timers
• Suggested and recent locations in Maps
• Contacts and locations in smart replies

Some features may not be available for all countries or all areas, for more information visit:

https://www.apple.com/watchos/feature-availability/

https://www.apple.com/watchos/

For information on the security content of Apple software updates, please visit this website:

https://support.apple.com/kb/HT201222