watchOS 4

Apple previewed watchOS 4 on June 5, 2017, and released it on September 19. The Siri face organized information by time, location and routines, alongside Toy Story and Kaleidoscope faces. This historical face is not later Siri AI. The announcement required iPhone 5s or later with iOS 11 for pairing.

Family

watchOS

Version

4

Platform

Apple Watch (all models of the period)

Apple · Security release register 2016-2017 · Apple · watchOS 4 preview · 2017-06-05 · Apple · Series 3 / watchOS 4 release plan · 2017-09-12 · Apple · watchOS 4 update notes

Workout added HIIT, mixed workout sessions and automatic pool-swim sets. Notes reserve resting heart rate and elevated-rate alerts for Series 1 or later. System support on the original Apple Watch does not mean every new metric and alert was available there.

Apple · watchOS 4 update notes

GymKit was still described as forthcoming in September's announcement. The 4.1 notes add compatible gym-machine syncing and music streaming on Series 3, not 4.0 launch features for every watch. The 4.0.1 update for Series 3 GPS + Cellular fixed joining unauthenticated captive Wi-Fi networks.

Apple · Security release register 2016-2017 · Apple · Series 3 / watchOS 4 release plan · 2017-09-12 · Apple · watchOS 4 update notes

Apple Pay Cash arrived in 4.2 for the US only, while snow-sport features for apps required Series 3. In 4.3 HomePod control arrived and iPhone music control returned; 4.3.1 fixed startup stalls at the Apple logo. The table separates milestones through 4.3.2 without builds or a promise that every feature was worldwide.

Apple · watchOS 4 update notes · Apple · Security release register 2018-2019