The Complete Guide to macOS 27 Golden Gate

macOS 27 Golden Gate is one of those rare upgrades (like going from Leopard to Snow Leopard, for those who remember it) that focuses more on improving what’s already there than on new features. To be sure, there are new features, including a few big ones. But even those—I’m thinking of Siri AI in particular—are mostly revisions of existing features rather than entirely novel capabilities.

This complete guide follows the order the book does, which is the order you meet the changes. What is new, whether your Mac qualifies, installing it, and what to do when that fails. Then the interface, Siri AI, the family settings and the apps. Two further sections cover what comes after — securing the Mac, and finding it if it goes missing.

The complete list of changes

There are also thirteen smaller tips that are easy to walk past.

Apple’s own page for this release is unusually sparse. The long feature lists circulating online all trace back to a single slide shown for under two seconds at the WWDC keynote. The focus here is on what’s different from Tahoe and other recent versions of macOS.

Can your Mac run macOS 27

macOS 27 runs on all currently shipping Macs, as well as most models introduced within the past five years or so. Sadly, macOS 27 does drop support for some Mac models that were able to run macOS 26 Tahoe. So it is worth verifying that your hardware is fully compatible before you start.

macOS 27 Golden Gate Compatibility: Which Macs Qualify

Installing the macOS 27 upgrade

Up through 2019, I wrote an entire book every year on the process of upgrading to the latest Mac operating system. These articles condense all of those upgrading instructions.

When it goes wrong

Even if you diligently follow all the instructions, you might encounter problems while upgrading. I can’t anticipate every difficulty you may have (or provide solutions in every case), but here are two of the most likely issues and how to deal with them.

Liquid Glass, walked back

The most controversial change in Apple’s version 26 operating systems, including Tahoe, was the new Liquid Glass interface, which greatly increased the use of transparency and glass-like distortion effects that added some glitz to the screen without increasing usability. In many cases, the new appearance made text harder to read, icons more difficult to decipher, and windows more cumbersome to use.

Over subsequent Tahoe releases, Apple made some adjustments to Tahoe to address a few of the most frequent Liquid Glass criticisms. But in macOS 27, Apple has gone further still, tacitly acknowledging that Liquid Glass went too far the first time around while retaining the overall look and feel introduced in Tahoe.

If you hated Liquid Glass in Tahoe, you’ll probably find it less objectionable in macOS 27, but make no mistake: the user interface looks far more like that of Tahoe than that of Sequoia.

Siri AI on the Mac

Siri AI has a complete guide of its own, covering both platforms. Anyone with even a casual awareness of the news about the version 27 operating systems will have heard that the marquee feature is the long-promised and long-delayed Siri, now called Siri AI.

For the family

macOS 27 expands the existing Family features parents and guardians can use to restrict their kids’ screen usage, with an emphasis on safety. (You must first enable a Family account and add family members in System Settings > Family.) These new features require that both the parents’ and kids’ devices are running version 27 or later of their respective operating systems; if you haven’t already done so, a message at the top of the Family setting pane reminds you.

The Mac apps

Beyond the bigger features, many Mac apps received smaller tweaks. Although fewer apps received noteworthy updates in macOS 27 than in past versions, several are worth knowing about.

Securing the Mac afterwards

An upgrade is a good moment to check the settings you set once and then forget. These come from a separate guide to securing Apple devices. They apply whichever version you are running.