Apple on Tuesday seeded the second beta of macOS Sierra 10.12.4 to developers, two weeks after seeding the first macOS Sierra 10.12.4 beta and just over a two weeks after releasing macOS Sierra 10.12.3.
macOS Sierra 10.12.4 brings iOS’s Night Shift mode to the Mac for the first time. First introduced with iOS 9.3, Night Shift is designed to gradually shift the display of a device from blue to yellow, cutting down on exposure to blue light. Blue light is said to disrupt the circadian rhythm and is believed to interrupt sleeping patterns.
The 10.12.4 update focuses mainly on Night Shift, but also includes dictation support for Shanghainese, cricket scores for Siri, and improved PDFKit APIs. Today’s beta adds an opt-in option for iCloud Analytics that pops up after installing the update.
Today’s beta comes 1 day after the second betas for iOS 10.3, watchOS 3.2, and tvOS 10.2, and two weeks after the original macOS 10.12.4 beta was released. Registered Mac developers can install the new software via the Updates tab in the Mac App Store or through Apple’s dev portal.
Apple has also seeded iOS 10.3 beta 2 to public testers. Folks in Apple’s public beta program can access the release via Settings > General > Software Update. We’re installing the betas now, and will update this post with any changes.