The fourth version, watchOS 4, was released on September 19, 2017. The third version, watchOS 3, was released on September 13, 2016, to emphasize better performance and include new watch faces and stock apps. The second version, watchOS 2, included support for native third-party apps and other improvements, and was released on September 21, 2015. watchOS exposes an API called WatchKit for developer use. It was released on April 24, 2015, along with the Apple Watch, the only device that runs watchOS. It is based on iOS, the operating system used by the iPhone, and has many similar features. WatchOS is the operating system of the Apple Watch, developed by Apple Inc. Proprietary software except for open-source components
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