MacOS 11 Big Sur beta 3 to developers. Apple has released the beta 3 of macOS 11 Big Sur to developers. The third beta (build 20A5323l) arrives 15 days after the release of the second beta of the new operating system (build 20A4300b), presented at the latest developer conference (WWDC 2020).
macOS Big Sur boasts a new design, includes the most important Safari update ever, and important news for Messages, Maps and privacy. There are specific news for developers, including the important SwiftUI update that allows you to create entire apps with code shared between the various Apple platforms, while adding Mac-specific functions such as the Preferences windows. Mac Catalyst, which debuted last year with macOS Catalina, allows developers to easily bring their iPad apps to the Mac. And in macOS Big Sur, apps created with Mac Catalyst automatically inherit the new look of the operating system, while offering new, powerful APIs and full control over the appearance and behavior of their apps.
The beta version of macOS Big Sur is available on developer.apple.com for developers enrolled in the Apple Developer Program; the public beta for Mac users will be available soon on beta.apple.com. macOS Big Sur will be available as a free software update in the fall (at this address the list of Macs with which it will be compatible)
How to install macOS Big Sur Beta right now