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macrumors bot
Original poster
Apr 12, 2001

Apple today seeded the third beta of an upcoming macOS High Sierra update to developers for testing purposes, more than two weeks after seeding the original second beta and over a month after introducing the new software at its 2017 Worldwide Developers Conference.

The new beta can be downloaded from the Apple Developer Center or over-the-air using the Software Update mechanism in the Mac App Store.

macOS High Sierra focuses on new core storage, video, and graphics technology, introducing a new Apple File System (APFS), High Efficiency Video Codec (HEVC) and an updated version of Metal with support for VR and external GPUs.

Some apps are also gaining new features. Photos is being updated with a new sidebar that's designed to make it easier to access editing tools and albums, and there are new filters and editing options like Curves and Selective Color. Photos also supports external editing apps like Photoshop and Pixelmator, saving changes made in those apps, and it interfaces with third-party printing services.

Safari is gaining speed enhancements, an option to end autoplay video, and a new feature that puts a stop to data tracking. Siri in macOS High Sierra has expanded music capabilities and a new, more natural voice, and Spotlight supports flight status information. There are also improvements to iCloud, FaceTime, Messages, and Notes.

macOS High Sierra is available for both registered developers and public beta testers, and it's likely a new public beta that's identical to the third developer beta will be released later this week.

Article Link: Apple Seeds Third Beta of macOS High Sierra to Developers


macrumors 6502
Jan 27, 2013
Unfortunately it seems my Mac doesn't have the disk space to download the new beta to fix the APFS space concern. Going to have to try and find a way to get the new beta onto an external drive. Anyone have any ideas?
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macrumors 68000
Sep 27, 2006
United States
Is there a list of what new features are supported on which machines? I tried to find for Sierra as well, never found it. (Easier to find lists for iOS)

For instance: going back, continuity and handoff are only partially supported on pre-2012 MacBook Pro models.
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macrumors member
Mar 12, 2015
APFS and 3tb Fusion drives for my imac still listed as an issue in the release notes!

Think i'll hold off some more from playing with APFS
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macrumors member
Apr 21, 2017
Can you elaborate?
Windows pop to the left of your screen(hard to get them back in center since they go out of bounds), when you right click on stuff the box appears randomly some other place, some apps won't launch(the reason I uninstalled), has wifi disconnection issues. Basically it's a beta, I had to reinstall my old os, if you feel like doing this use a time machine backup or don't even bother. If you plan to use you computer for work most likely a bad idea. I did really love the new files system it's blazing fast.
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