watchOS 4
Source: - watchOS 4

watchOS 4

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 The system has been released on 19 September 2017 and gets the last update (4.3.2) on 9 July 2018 and later has been replaced by a newer version of watchOS 5.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


Introduced19 September 2017
System RequirementsApple Watch
Apple Watch Series 1
Apple Watch Series 2
Apple Watch Series 3
iPhone 5s or later
iOS 11 or later
DistributionTrough paired iPhone


VersionsBuildRelease Date
watchOS 4.015R37219 September 2017
watchOS 4.115R84631 October 2017
watchOS 4.215S1025 December 2017
watchOS 4.2.215S54223 January 2018
watchOS 4.2.315S600b19 February 2018
watchOS 4.315T21229 March 2018
watchOS 4.3.115T56729 May 2018
watchOS 4.3.215U709 July 2018

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