Apple releases fourth Developer Beta of watchOS 10

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Appleosophy | Apple releases fourth Developer Beta of watchOS 10
Image: Apple Newsroom

Apple has started rolling out the fourth developer beta of watchOS 10 with important bug fixes, according to Apple’s Developer Webpage. This update comes three weeks after the release of the third beta of watchOS 10.

Last month at WWDC 2023, Apple announced watchOS 10 with a new Design Language, changes to Navigation, New Watch Faces, Last Cellular Connection Waypoint, calorimetry for e-biking, Fall Detection, and advanced new metrics for cycling.

watchOS 10
Image: Apple Newsroom

In addition to these features, users can also use the Digital Crown on their Apple Watch to log their momentary emotions and daily moods in the Mindfulness app. Using the Ambient Light Sensor on the Watch, it can now measure time spent in daylight as well.

The build number of this update is 21R5320i and you can expect the size of the update to be around 600 MB on your Apple Watch. The size of the update depends upon the Apple Watch model that you have and the software version you’re updating from.

Users who are registered as a developer on can opt-in to receive beta updates by going into the Watch App on their iPhone and navigating to My Watch>General>Software Update>Beta Updates and selecting watchOS 10 Developer Beta. Do note that this version is not stable and is meant for testing purposes.
Users will also be able to sign up as a Public Beta Tester for iOS 17, iPadOS 17, macOS 14 Sonoma, watchOS 10, and tvOS 17 on as they are ‘Coming Soon’.

watchOS 10 is compatible with the following Apple Watch models:

  • Apple Watch Series 4
  • Apple Watch Series 5
  • Apple Watch Series 6
  • Apple Watch SE (1st generation and 2nd generation)
  • Apple Watch Series 7
  • Apple Watch Series 8
  • Apple Watch Ultra

Additionally, users will also need to have iPhone XS, iPhone XR or later running iOS 17 in order to update to watchOS 10.

Along with watchOS 10 Beta 4, Apple also released the fourth developer betas of iOS 17, iPadOS 17, tvOS 17, and macOS Sonoma. The final versions of these will be released to the public this fall, most likely in September.

How excited are you about these upcoming software with useful new features? Let us know down in the comments or tweet to us on @appleosophy! Be sure to download the Appleosophy App from the App Store or visit our website to stay updated with the latest Apple news!

Pururaj Dutta
Author: Pururaj Dutta

Pururaj is the Vice President of Appleosophy and Silicon Report, in addition to being the Manager of popular Redfruit Media platforms such as TechPod Social and Apple Summit. His seasoned experience plays a pivotal role in the success of Redfruit Media, contributing significantly to shaping the ever-evolving tech landscape. As a tech aficionado, he enjoys exploring & reviewing new products, and sharing his insights with the community. With an unwavering passion for technology, Pururaj is committed to delivering accurate and insightful information to his readers.

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