watchOS

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Apple VP of Technology Kevin Lynch introduces watchOS 6 at WWDC 2019.

watchOS is the operating system software of Apple Watch, derived from iOS. The software can be updated by a paired iPhone with the Apple Watch app. The current version of watchOS is 6.1.2.

watchOS 1 History

watchOS 1.0

• Based on iOS Version 8.2
• Release Date: April 24th, 2015
• Build Number: 12S507

watchOS 1.0.1

• Based on iOS Version 8.3
• Release Date: May 19th, 2015
• Build Number: 12S632

watchOS 2.0

• Based on iOS Version 9.0
• Release Date: September 21st, 2015
• Build Number: 13S344

watchOS 2.0.1

• Based on iOS Version 9.1
• Release Date: October 21st, 2015
• Build Number: 13S428

watchOS 2 History

watchOS 2.1

• Based on iOS Version 9.2
• Release Date: December 8th, 2015
• Build Number: 13S661

watchOS 2.2

• Based on iOS Version 9.3
• Release Date: March 21st, 2016
• Build Number: 13V144

watchOS 2.2.1

• Based on iOS Version 9.3.2
• Release Date: May 16th, 2016
• Build Number: 13V420

watchOS 2.2.2

• Based on iOS Version 9.3.3
• Release Date: July 18th, 2016
• Build Number: 13V604

watchOS 3 History

watchOS 3.0 Beta 3

• Based on iOS Version 10.0
• Release Date: July 18th, 2016
• Build Number: 14S5290d 
  

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External links

• watchOS at Apple
• watchOS at Wikipedia