Apple today is rolling out the third beta of watchOS 4 to developer. The rollout comes following the release of the third betas of macOS High Sierra, tvOS 11, and iOS 11 earlier this week. The update carries the build number 15R5321h.

watchOS 4 includes changes such as interface tweaks, app list navigation, and more. We’ve gone in-depth with over 50 of the changes watchOS 4 brings. Read our past coverage of the update at the links below:

Of note, you should be particularly cautious when installing the watchOS 4 beta as there is no way to revert to the more stable watchOS 3 in case of problems. Nevertheless, the update is available in the Apple Watch app on iPhone for developers.


FTC: We use income earning auto affiliate links. More.


Check out 9to5Mac on YouTube for more Apple news:

You’re reading 9to5Mac — experts who break news about Apple and its surrounding ecosystem, day after day. Be sure to check out our homepage for all the latest news, and follow 9to5Mac on Twitter, Facebook, and LinkedIn to stay in the loop. Don’t know where to start? Check out our exclusive stories, reviews, how-tos, and subscribe to our YouTube channel

About the Author