macOS 10.15

Apple's next-generation macOS operating system, preview expected in June.

macOS 10.15

At a Glance

  • Expected to debut at WWDC in June, macOS 10.15 is Apple's next operating system for the Mac lineup. Rumored features include cross-platform app support for third-party apps.

Expected Features

  • Cross-platform app compatibility
Last Updated 1 day ago
Highlight Recent Changes

Subscribe for regular MacRumors news and future macOS 10.15 info.

What We Expect

The next major update to Apple's macOS operating system, macOS 10.15, is already in development at Apple's headquarters in Cupertino, California. We don't know much about macOS 10.15 at this early point in time, but we've heard a few intriguing rumors that reveal some details about the upcoming update.

Apple is working on a new universal apps feature, which first debuted in macOS Mojave and iOS 12, and will expand to developers in iOS 13 and macOS 10.15. To test the feature, Apple ported several iOS apps, including Home, Stocks, and Voice Memos, to macOS in macOS Mojave.

According to Bloomberg, Apple plans to release the first part of the iOS to Mac SDK in iOS 13 and macOS 10.15. Developers will be able to port iPad apps to the Mac this year.

After that, in 2020, Apple will work on allowing iPhone apps to be ported over to the Mac, and by 2021, the company's goal is to allow developers to create a single app for multiple plaforms. Apple's multi-step multi-year initiative is known as "Marzipan" internally.

Apple's ultimate aim with Marzipan is to let developers design a single app that works with either a touchscreen or a mouse and trackpad based on whether it's running on iOS or macOS. This universal app feature would likely significantly increase the number of apps available on Macs while also cutting down on developer workload to create cross-platform apps.

Apple began issuing warnings about 32-bit apps in macOS Mojave, and has said that Mojave will be the last version of macOS to support them. Apple is expected to phase out support for 32-bit apps in macOS 10.15, which means some older apps that haven't been updated in awhile will cease to work.

Little else is known about the update at this time, but additional details are likely to be shared as we get closer to the 2019 Worldwide Developers Conference where Apple will preview updates to iOS, macOS, tvOS, and watchOS.

Prospective Names

Starting in 2016, Apple did away with the traditional "OS X" naming system in favor of "macOS," a name that better fits in with iOS, tvOS, and watchOS. "macOS" will continue to be used in 2019, and the update is also likely to continue to have a name that represents a California landmark.

Apple has been naming its operating system updates after various locations in California since 2009, and so far, we've had Mavericks, Yosemite, El Capitan, Sierra, High Sierra, and Mojave.

There's no word yet on what the next version of macOS will be called, but in 2014, Apple trademarked a long list of landmark names that could be used for future OS X updates. Names range from popular beaches to well-known cities to notable mountains and deserts. Apple even included a few names highlighting iconic California animals, including Condor, Grizzly, and Redtail.

Here's the full list of known trademarked names that have yet to be used: Redwood, Mammoth, California, Big Sur, Pacific, Diablo, Miramar, Rincon, Redtail, Condor, Grizzly, Farallon, Tiburon, Monterey, Skyline, Shasta, Sequoia, Ventura, and Sonoma.

Monterey, California

Apple may be choosing names from the list randomly, but with a water name and six land-based names having been used in 2013, 2014, 2015, 2016, 2017, and 2018, we may potentially be due for another water-based name.

If that's the case, ocean oriented names like Pacific, Monterey, Farallon, or Rincon could be in the running, but it is not clear if Apple is following any kind of specific naming scheme. It's also possible that Apple will deviate from its trademarked list of California-related names to choose something else.

Discuss macOS 10.15

Have features that you're hoping to see Apple introduce in the next-generation version of macOS? Make sure to check out our forums where our readers often discuss upcoming software updates ahead of their debut.

Release Date

We expect to see a preview of macOS 10.15 at the 2019 Worldwide Developers Conference, which has historically been held in June. We don't know this year's exact dates, but Apple is likely to share information about WWDC 2019 over the course of the next couple of months.

macOS 10.15 will likely be introduced at a keynote event during the Worldwide Developers Conference, with Apple then providing the new software update to developers for testing purposes. Later in the summer, Apple will also offer the update to its public beta testers.

An official public release of macOS 10.15 is likely to come in the fall of 2018 following several months of beta testing and software updates.

macOS 10.15 Timeline