watchOS is Apple's operating system for the Apple Watch, powering health tracking, notifications, and apps on its wearable devices.
Apple's second 27.2 public betas are the same builds developers got a day earlier as beta 3. Testers can use what is visible now, but the Apple TV 4K and HomePod features in the code stay hidden until Apple announces them.
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Apple released beta 3 of iPadOS, watchOS, tvOS and visionOS 27.2 two weeks after beta 2, with new iOS and macOS builds alongside. The Health changes can be tested now, while Apple has not said what tvOS and visionOS add, and those changes may wait on rumored hardware.
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Apple released watchOS 27.0.1 to six older Apple Watch models on the day it shipped iOS, iPadOS, macOS and visionOS updates. MacRumors says the watch build lists no security fixes, so iPhones and Macs should set the order of any combined pass.
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Apple's evidence for calling the Ultra 4's new optical sensor the most accurate in a wearable is a white paper Apple published, drawn from a study where most participants wore competitor watches on the other wrist. DC Rainmaker is testing it outdoors.
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The merged PR shares source, resources and themes with the phone build while keeping storage separate, and on Android the standalone flag takes the phone product's slot because no companion Wear APK exists yet.
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