watchOS 4 is an operating system that was designed, developed by Apple in 2017, and was preinstalled on the new Apple Watches and as an update through the iPhone for the previous series. The system has been released on 19 September 2017 and gets the last update (4.3.2) on 9 July 2018 and later has been replaced by a newer version of watchOS 5.
watchOS 4 features a proactive Siri watch face, personalized activity coaching, and an entirely new music experience. It also introduces GymKit, a technology platform to connect workouts with cardio equipment.
Today watchOS 4 is 3 years old!
watchOS 4 – General information
|Introduced||19 September 2017|
|System Requirements||Apple Watch|
Apple Watch Series 1
Apple Watch Series 2
Apple Watch Series 3
iPhone 5s or later
iOS 11 or later
|Distribution||Trough paired iPhone|
|watchOS 4.0||15R372||19 September 2017|
|watchOS 4.1||15R846||31 October 2017|
|watchOS 4.2||15S102||5 December 2017|
|watchOS 4.2.2||15S542||23 January 2018|
|watchOS 4.2.3||15S600b||19 February 2018|
|watchOS 4.3||15T212||29 March 2018|
|watchOS 4.3.1||15T567||29 May 2018|
|watchOS 4.3.2||15U70||9 July 2018|