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Macs Will Run iPhone and iPad Apps: Here’s How It Will Work

Several iOS apps running on a Mac.
Apple

The rumors were right: Apple is shifting away from Intel in favor of its own Apple Silicon ARM-based processors. This will bring some big changes with it for anyone who uses a Mac. Chief among these is the ability to natively run iOS and iPadOS apps on a macOS system.

iPhone and iPad Apps Are Coming to the Mac

Apple is already producing its own processors for the iPhone, iPad, and most of its non-Mac lineup (including the Apple TV, HomePod, and Apple Watch). These platforms run on ARM-based chips, commonly chosen for their superior battery life and thermals compared to the Intel chips in the Mac.

The company is now moving ahead and transitioning the Mac lineup to ARM-based custom-designed processors. This means that iPhone and iPad apps will be natively compatible with the new models, as they’re designed to run on the same type of processor.

According to Apple, apps written for the iPhone and iPad won’t require any modifications to work on a new ARM-based Mac. The company demonstrated this at its Worldwide Developers Conference (WWDC) using apps like Monument Valley 2, Calm, and Fender Play.

"Monument Valley 2" running on macOS via Rosetta 2.
Apple

This means an estimated two million App Store apps will be natively compatible with macOS in the near future. They run in windows that match the aspect ratio of the original platform. Twitter for iPhone, for example, will appear as a portrait window, just as it does on an iPhone screen.

Just about anything from the App Store will be available. Services like Instagram and TikTok, which lack Mac apps entirely, will finally have Mac-compatible versions available. It’s unclear at this stage whether developers will be able to opt-out of making their apps available on Mac.

However, developers will be able to tailor their apps to the Mac platform. Small tweaks, like removing the software keyboard while typing, will make all the difference when it comes to the usability of these apps.

Apple hasn’t shared a ton of details about this, and no ARM Macs have yet been released outside of a secretive Developer Transition Kit. We’ll have to wait and see how it works out.

RELATED: How the Mac Will Switch From Intel to Apple's Own ARM Chips

Which Macs Will Natively Support iPhone and iPad Apps?

Native support for iPhone and iPad apps will only be available on Macs with the new ARM systems-on-chip (SoCs). Apple said the first Macs to use Apple Silicon will be released before the end of 2020, although it hasn’t yet said which product lines will be updated.

An iMac redesign was heavily rumored in the weeks leading up to WWDC, and the MacBook Pro and MacBook Air have both seen fairly recent redesigns. This has caused much speculation that the first Apple Silicon Mac will be a desktop all-in-one. The company hopes to have finished the transition of the entire Mac line by 2022.

Apple silicon features.
Apple

Note that native support for these apps isn’t the same as Apple’s Catalyst project, which added apps like News, Voice Memos, and Stocks to macOS Mojave in 2018. Catalyst allows iPad developers to easily port their iOS apps to the Mac, ultimately enabling universal purchases between the two platforms.

While Catalyst has already been used to bring third-party iPad apps, like Twitter, to the Mac, it’s not the same as natively running an iPhone or iPad app on an ARM Mac. Native apps don’t need to be recompiled, as they’re already compatible with the processor architecture. Catalyst enables Xcode to create, in effect, two versions of an app—one for each platform.

None of that will be necessary on the Macs that ship with Apple Silicon.

What’s ARM and How Is It Different?

To understand the difference between Intel chips and Apple Silicon, you first have to understand the basic differences in processor architecture. Intel produces x86 processors, which are different from the Apple Silicon ARM processors to which Apple is transitioning.

While x86 processors are designed for Complex Instruction Set Computing (CISC), ARM processors use Reduced Instruction Set Computing (RISC), instead. ARM processors handle simpler instructions, which are often completed over a single CPU clock cycle. CISC architecture, however, does more simultaneously, spread over several cycles.

In essence, these are two different approaches to a very similar end goal: running software efficiently. Because RISC uses a less complex instruction set, ARM devices generally use less power and produce less heat. This is why ARM is the technology of choice for smartphones, tablets, single-board computers (like the Raspberry Pi), and even the Nintendo Switch.

A graph showing the performance and power benefits of "Macs with Apple Silicon."
Apple

Historically, x86 has outperformed ARM in terms of raw power. This is why desktop computers still use 64-bit x86 chips, like the Intel Core series. Since these chips produce more heat and require more power, they’re suitable for desktops, as cooling and power are less of an issue. They’re also still used in most laptops, although Microsoft’s Surface Pro X is powered by ARM.

Software designed for the CISC instruction set needs to be rebuilt to work natively on RISC machines. Software already written for ARM devices, like the entire collection of iPhone and iPad apps in the App Store, will work natively on Apple Silicon computers when they finally arrive later this year.

This is just the tip of the iceberg when it comes to Apple’s transition to ARM. There’s plenty more to discuss, like improved battery life, less heat, and a tighter marriage of software and hardware.

Got an Intel Mac? No iPhone or iPad Apps for You

With the first ARM Mac expected by the end of the year, Apple will still be selling Intel models for a while yet. Just like the transition from PowerPC to Intel in 2006, Apple has committed to supporting Intel-based computers for the foreseeable future. Unfortunately, that doesn’t include support for iPhone or iPad apps.

Building a Universal app in Xcode

Moving forward, apps written specifically for the Mac will function on both Intel and Apple Silicon models. This is possibly thanks to Xcode 12, and its ability to create “Universal 2” binaries, which work on both processor architectures. Apple has announced no such plans to bring the iPhone and iPad app library to non-ARM models.

This will arguably create a demand for ARM Macs by setting them apart from the pack. The new machines will lose the ability to run Windows via Boot Camp (although, maybe not the ARM version). So, universal compatibility with iPhone and iPad apps might just be the carrot Apple will dangle to sell Apple Silicon.

What About Mac Apps Written for Intel?

Since the new ARM-based Macs won’t be natively compatible with software written for models with an Intel chip, what happens to all of your existing software? It’s possible developers with big budgets, like Adobe and Microsoft, can meet Apple’s looming deadline for a native ARM version. But what about smaller developers who lack the time and resources?

Don’t worry—new Macs won’t be trading classic Mac desktop apps for those on iPhone and iPad. Developers can recompile their existing Intel apps for ARM, but you can run exactly the same Mac apps you run on macOS Catalina today on a new ARM-based Mac.

This is made possible by Rosetta 2—an updated version of the dynamic binary translator used to transition Mac owners from PowerPC to Intel in 2006. The company demonstrated Rosetta 2 at WWDC 2020 using 3D modeling and the animation software Maya, which seemed to be running flawlessly.

Rosetta for Intel/PowerPC.
Apple

Even more impressive was the highly responsive demo of Shadow of the Tomb Raider, also running via Rosetta. Whether we can expect similar performance in all applications remains to be seen, but benchmarks of the ARM-based Developer Transition Kit (DTK) seem promising.

The DTK is a modified Mac mini with a slightly underclocked A12Z iPad Pro chip, with 16 GB of RAM, and a 512 GB SSD. Despite Apple’s insistence to the contrary, some developers have been running Geekbench on their DTKs to ascertain performance. Since there’s no native version of Geekbench available for ARM Macs, the benchmarks were conducted using Rosetta.

Early results showed that Geekbench via Rosetta on an A12Z outperformed Microsoft’s ARM-based Surface Pro X running a native version of the same benchmarking tool. Take those results with a pinch of salt, but it’s a good sign, considering the A12Z is a two-year-old chip. The first ARM-based Mac could use a far more powerful processor than the one in the iPad Pro.

One reason for such promising performance might lie in the fact that Rosetta 2 does much of the heavy lifting during the installation phase. This has been likened to recompiling the app as a “Universal 2” application.

For an idea of how long this compatibility period might last, Rosetta was first introduced with OS X 10.4.4 Tiger in 2005. In 2011, It was made an optional component with the release of OS X 10.6 Snow Leopard. Support for Rosetta was officially dropped altogether with the release of OS X 10.7 Lion in 2012.

Apple Silicon Launches Later in 2020

We don’t know when Apple Silicon will arrive, but Apple insisted it will be this year. It’s also unclear whether the change in architecture will result in cheaper models, since Apple controls the process, or if prices will go up to cover research and development costs.

Apple Silicon was just a small slither of what Apple announced at WWDC 2020. Check out the new features coming to macOS and what iOS 14 has in store for iPhone and iPad owners.

RELATED: What's New in macOS 11.0 Big Sur, Arriving Fall 2020

Tim Brookes Tim Brookes
Tim Brookes is a technology writer with more than a decade of experience. He's invested in the Apple ecosystem, with experience covering Macs, iPhones, and iPads for publications like Zapier and MakeUseOf.
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