Apple Reminds Developers App Updates Must Support 64-Bit Starting June 2018, Warns Customers About Unoptimized Apps

Apple today reminded developers about upcoming changes being made to the Mac App Store. Starting on June 1, all new app updates submitted to the Mac App Store must support 64-bit.

Apple already requires new apps submitted to the Mac App Store to offer 64-bit support, a change that went into effect in January of 2018, so this upcoming policy shift will only affect older apps that have not yet implemented 64-bit support.


Along with the warning to developers, Apple says customers who are running the latest macOS 10.13.4 update will begin receiving warning messages when launching a 32-bit app for the first time to let them know that the app is not optimized for their Mac. According to TechCrunch, these warnings will start at midnight Pacific Time on April 12.

With the recent release of macOS High Sierra 10.13.4, the first time users launch an app that does not support 64-bit they will see an alert that the app is not optimized for their Mac.

As a reminder, new apps submitted to the Mac App Store must support 64-bit, and starting June 2018, app updates and existing apps must support 64-bit. If you distribute your apps outside the Mac App Store, we highly recommend distributing 64-bit binaries to make sure your users can continue to run your apps on future versions of macOS.

Apple used a similar warning system when phasing out 32-bit support on iOS before eventually ending support with iOS 11, and the company has said the same plan will be used as 32-bit Mac apps are phased out.

Apple first warned developers and consumers about the impending Mac App Store changes starting last June at the 2017 Worldwide Developers Conference. Apple is slowly ending support for 32-bit Mac apps and has said macOS High Sierra will be the "last macOS release to support 32-bit apps without compromises" and "all future Mac software will eventually be required to be 64-bit."

Top Rated Comments

(View all)
Avatar
30 months ago

Why even bother going to 64 at this point when 128 is right around the corner?

Apple’s stupidity never ceases to amaze.

The sheer ignorance in this comment is as amazing as “apple’s stupidity” is to you. 128 bit OS’s right around the corner? The number of bits refers 2 to the power of that many bits of addressable locations. That means the addressable locations is 4,294,967,296 for 32 bit processsors and over 18,446,744,073,709,551,616 for 64 bits. This in turn means the the most RAM per process we could have for a 32 bit computer is 4GB while for 64 bit, which is about 16 exabytes. It’s more than conceivable that we won’t have need for 128 bit environments for decades to come.

EDIT: clarification about the maximum amount of RAM.
Score: 17 Votes (Like | Disagree)
Avatar
30 months ago

Why even bother going to 64 at this point when 128 is right around the corner?

Apple’s stupidity never ceases to amaze.

I wish I could be $900B stupid and the most profitable company is history.
Score: 13 Votes (Like | Disagree)
Avatar
30 months ago

Why even bother going to 64 at this point when 128 is right around the corner?

Apple’s stupidity never ceases to amaze.

I don't think that's the point at all. The point is to push developers to ditch 32. Apple has been in world of 64 for a while.
Score: 11 Votes (Like | Disagree)
Avatar
30 months ago

I don't think that's the point at all. The point is to push developers to ditch 32. Apple has been in world of 64 for a while.

Apple wants to dump the 32bit libraries from the OS. It's a pretty big win for the development of macOS to rid themselves of that code and maintenance work.

Source: I'm currently sitting waiting on a 32bit build to pop out of Jenkins. It takes 3x longer than my 64bit builds because of "reasons" and constantly holds up our development.
Score: 9 Votes (Like | Disagree)
Avatar
30 months ago

Could somebody clarify that this will only affect MAS apps and not all Mac apps that are 32 bit? I have some older universal binary 32bit apps that I still want to be able to use, and hopefully they won't be obsolete in two years.

They plan to remove 32 bits support from the OS in the future, it includes non-MAS apps.
Score: 7 Votes (Like | Disagree)
Avatar
30 months ago
Saw this post and thought "what could I have that's so old it's 32 bit?"
Aha! Microsoft Office 2008 !
Just as well I used it's (32 bit) un-installer while I still could.
Good riddance.
Score: 6 Votes (Like | Disagree)

Top Stories

Apple Warns Against Closing MacBooks With a Cover Over the Camera

Friday July 10, 2020 11:12 am PDT by
Apple this month published a support document that warns customers against closing their Mac notebooks with a cover over the camera as it can lead to display damage. Image via Reddit Apple says that the clearance between the display and the keyboard is designed to very tight tolerances, which can be problematic. Covering the camera can also cause issues with automatic brightness and True Tone....

Leaker: 'iPhone 12 Pro' to Come With 6GB of RAM

Friday July 10, 2020 1:59 am PDT by
Later this year, Apple is expected to release four OLED iPhones in three display sizes, including 5.4, 6.7, and two 6.1-inch models. Rumors suggest the 6.7-inch iPhone and one 6.1-inch model will be higher-end devices, and now leaker @L0vetodream has corroborated previous rumors about the internal specs of Apple's upcoming lineup. Rumors suggest Apple will use 5-nanometer A14 chips in its...

Apple Moving Forward on Semitransparent Lenses for Upcoming AR Headset

Friday July 10, 2020 7:24 am PDT by
Apple and Foxconn have reached a key milestone in the development of Apple's long-rumored augmented reality headset, with the semitransparent lenses for the device moving from prototype to trial production, reports The Information. Apple is developing the lenses on a single production line at a Foxconn factory in Chengdu in southwestern China, where most of Apple’s iPad production is...

Kuo: Apple Silicon Macs to Include 13-inch MacBook Pro and MacBook Air This Year, 14.1-inch and 16-inch MacBook Pro Models Next Year

Friday July 10, 2020 2:58 am PDT by
At last month's WWDC, Apple officially announced that its Mac computers will be transitioned from Intel x86 to homegrown Apple Silicon chips. Apple said it plans to deliver the first Apple Silicon Mac by the end of the year and complete the transition in about two years. According to Apple analyst Ming-Chi Kuo, a 13.3-inch MacBook Pro with a form factor similar to the current 13.3-inch...

Arm-Intel-PowerPC Universal Binaries Are Possible

Saturday July 11, 2020 1:42 pm PDT by
Casual MacRumors visitors may not realize that we have a very active PowerPC forum where users discuss issues related to PowerPC Macs that have not been produced since 2006. Threads range from hardware upgrades and software options to nostalgia: Photo by AphoticD Apple's recently announced transition to Apple Silicon (Arm) based Macs raised some interesting questions about future support...

iPhone 12 Sizes Compared with iPhone SE, 7, 8, SE 2, X, 11, 11 Pro and 11 Pro Max [Update]

Tuesday July 7, 2020 6:49 pm PDT by
Apple is planning on launching the iPhone 12 this fall which is rumored to be coming in 3 different sizes: 5.4", 6.1" and 6.7". The middle size (6.1") matches up with the currently shipping iPhone 11, but the other two sizes will be entirely new. Over the weekend, there was some excitement about how well the new 5.4" iPhone 12 compares to the original iPhone SE. Those who have been hoping...

Tom Hanks WWII Movie 'Greyhound' Debuts on Apple TV+

Friday July 10, 2020 3:33 am PDT by
Apple TV+ today debuted "Greyhound," the highly anticipated Second World War movie starring Tom Hanks as a naval officer given command of Navy destroyer Greyhound in the Battle of the Atlantic. "Greyhound" features Hanks as George Krause, who must fight his own self doubts and personal demons as he leads a convoy of Allied ships against German U-boats to prove that he belongs in command. ...

Top Stories: iOS 14 Public Beta, iPhone 12 Size Comparison, 14-Inch MacBook Pro Rumors

Saturday July 11, 2020 6:00 am PDT by
After one round of developer beta testing, Apple unleashed iOS and iPadOS 14 to a wider audience this week, opening it up to members of the public beta program. There are lots of changes and new features to check out, but as with any beta, be careful about installing it on your main devices. Subscribe to the MacRumors YouTube channel for more videos. Other major stories this week included our ...

Hands-On With tvOS 14: Picture in Picture, 4K YouTube, HomeKit and More

Thursday July 9, 2020 12:48 pm PDT by
Apple at WWDC introduced a new version of tvOS, the software that's designed to run on the fourth and fifth-generation Apple TV models. tvOS updates are often more minor in scale than iOS, watchOS, and macOS updates, but tvOS 14 has some useful new features. Subscribe to the MacRumors YouTube channel for more videos. Apple in tvOS 13 introduced a Picture in Picture option for the Apple TV...

Apple CEO Tim Cook's 2019 Compensation Totaled Over $133 Million

Friday July 10, 2020 12:01 pm PDT by
Apple CEO Tim Cook was the second highest paid CEO in the United States in 2019, according to Bloomberg's list of the highest paid CEOs and executives in 2019. Cook received compensation totaling $133,727,869 by Bloomberg's count. Almost all of Cook's compensation was provided in the form of stock awards and related performance bonuses. As reported by the SEC earlier this year, Cook received ...