Apple today released the fourth beta of macOS Sierra, the newest operating system designed for the Mac, to developers. macOS Sierra beta 4 comes two weeks after the release of the third beta and almost two months after the software was first unveiled at Apple's 2016 Worldwide Developers Conference.

Developers can download today's beta update through the software update mechanism in the Mac App Store or through the Apple Developer Center.



macOS Sierra is a significant update bringing Siri to the Mac for the first time, allowing users to conduct voice searches to quickly find files, look up information, and more. New Continuity features offer an "Auto Unlock" option for unlocking a Mac with an Apple Watch and a Universal Clipboard for copying something on one Apple device and pasting it on another.

Deeper iCloud integration makes files stored on the desktop or the Documents folder of a Mac available on all of a user's devices, and Photos features deep learning algorithms for improved facial, object, and scene recognition. There's a Memories feature for displaying photo collections, and Messages has rich links, bigger emoji, and "Tapback" response options.

Apple Pay is coming to the web in macOS Sierra, with payments authenticated through an iPhone or Apple Watch, and new features like multiple tabs, Picture in Picture multitasking, and optimized storage are also available.

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During the beta testing period, Apple will tweak and refine the features introduced in macOS Sierra. In macOS Sierra beta 4, Apple has introduced new emoji promoting gender equality and introduced a new look for many existing emoji with new textures and design tweaks.

macOS Sierra is currently available to developers and public beta testers, and it will see a wider public release this fall. For full details on all of the new features included in macOS Sierra, make sure to check out our macOS Sierra roundup.