Preparing for next year’s Rosetta 2 demise

The reckoning is coming. Apple has done it before, and it’s doing it again. After macOS 27 Golden Gate, you will no longer be able to run legacy Intel apps using Rosetta 2. After the 26.4 update in March, when running any affected app in macOS 26 Tahoe, you see a notification banner when you launch affected software or a background component launches that uses Intel code:

Support Ending for Intel-based Apps. This version of “[App Name Here]” will not open in a future release of macOS. Learn how to update to an Apple silicon version. [Learn More pop-up menu]

Whenever you launch an Intel-only app, macOS politely tells you the end is coming.

There is one carveout noted for “certain older, unmaintained games that rely on Intel-based frameworks,” so far unnamed.

With information in hand, you can plan how to deal with Intel-only apps that have been abandoned, or the developers have seemingly no interest in updating. Printer makers are, so far, the worst.

A history of looking backward

Apple has done this before—many times, in fact. I’ve argued in the past that one of Apple’s key strengths, and a key to the continuity of the Mac’s operating system, is how well it’s managed transitions across chip architectures, frameworks, and operating system changes.1

Look at what Apple has managed:

Motorola 680×0 to PowerPC (silent emulator)

Mac OS 9.1 (or later) to Mac OS X (Classic)

PowerPC to Intel (Rosetta, original flavor)

32-bit to 64-bit code (warnings)

Intel to Apple silicon M-series chips (Rosetta 2)

At each of those milestones, Apple offered either advance warnings about a future lack of compatibility, an emulator tool, or both. Does anyone have fond memories of running QuarkXPress using Classic in Mac OS X in its early days? When it crashed, which was often, it only took down the Classic “app” and didn’t require a Mac restart.

To be fair, Apple could have continued to let older software run for as long as it was willing to devote time to maintaining emulators or compatibility layers. We could be using apps written for Motorola 68030s on our M5 Macs right now! However, it makes increasingly less sense to support the past after a reasonable transition, particularly one that stretches years and sees the company discontinuing compatible hardware.

Apple released the last Intel-based model in August 2020, introduced its first M-series computer in November 2020, and halted sales of computers with Intel inside in 2023.

As part of this shift, you receive the Intel software warning, not just the first time you launch an affected app or an Intel-based component or even Terminal-accessed binary runs, but the next time you do it after a restart. Yes, it is trying to bug you to get a newer version of your software. Golden Gate also pulls an interesting trick: When you upgrade, it removes the Rosetta emulator. You’re prompted to install it the first time you need Intel code. I guess this is an extra spur to remind you.

Because Intel-only apps will continue to work under Rosetta until you install macOS 28 Dumbarton, these reminders will continue for at least another 16 months or so.2 Once you upgrade to macOS 28, those apps and components will simply stop working.

Sunsets can be beautiful

Use Golden Gate to review a list of Intel-only apps, although third-party apps can provide more information.

Apple includes a helpful tool in Golden Gate in System Settings: General: About. Click Details next to Intel-based Apps, and a dialog box appears that lists everything installed that requires Rosetta. As a nice touch, Apple shows you apps launched in the last year, along with when, so you know the most critical to upgrade or swap out.

Golden Gate will list all the apps (but not all components) that require Rosetta.

You can also examine any app in the Finder, choose Get Info from the File menu, and note the warning next to Kind. Apple allows apps to be compiled as universal binaries that include both Intel and Apple silicon code, and offers an Open using Rosetta checkbox that was useful in the early days of the swapover when some M-series versions of an app were missing features or were buggy compared to the Intel version. You sometimes checked that box to use the more stable Intel variety, and then surely forgot about it. (For instance, Adobe updated its primary apps faster than third parties did their plug-ins. To use some Photoshop plug-ins, you had to force Photoshop to run in emulation.)

The Get Info dialog is a way to check on the code status of an app.

Hover over the item, and you can click Visit Website if Apple has a link to one, or click the More … button and choose Show App in Finder or Move to Trash. Not every app or component has a Move to Trash item, and I’m not sure why. I also suggest installing AppCleaner, a free app that will root out all files associated with an app when it’s deleted. (Turn on SmartDelete to monitor the Trash, or you can drag apps onto it.) This ensures you’re not leaving cruft behind when you get rid of the app proper.

This is all fine for rooting out installed apps, but Apple may not catch every system component, command-line utility, or other software that lives in crevices and emerges in particular conditions. For that, you should take a look at:

Go64: The free app from St. Clair Software, the makers of our favorite app, Default Folder X, provides details in a list form.

Rosetta Check ($7): Turn to Rosetta Check for even more information about each unsupported app, which may be useful if you have a lot of software to work through updating.

HoudahSpot: If you use HoudahSpot, you can construct a search.

A few companies that have Intel-only apps or components have explained their migration path, with PaperCut being an excellent example. Others without any financial incentive—such as hardware makers, who sometimes barely care about compatibility for software required to support their products—may wait until after the 2027 transition to wake up and make changes. This has happened many times before!

[Got a question for the column? You can email glenn@sixcolors.com or use /glenn in our subscriber-only Discord community.]

Apparently, I wrote about this 20 years ago, in reviewing the Intel Core Duo iMac, a review and computer I have zero recollection of. ↩

Dumbarton Bridge, south of the Golden Gate, is highly underappreciated. ↩