With iOS 11, Apple phased out support for 32-bit iOS apps, and it had announced that macOS High Sierra 10.13 will be the last release to support 32-bit apps. So looks like it has started preparing Mac users about the lack of support for 32-bit apps as in macOS High Sierra 10.13.4 Apple has started showing an alert the first time you launch informing users that the “app is not optimized for. Find 32-Bit Mac Apps. On the desktop, click on the Apple logo ( ) at the upper left of the screen. Click About This Mac. In the window that pops up, click System Report.

With iOS 11, Apple phased out support for 32-bit iOS apps, and it had announced that macOS High Sierra 10.13 will be the last release to support 32-bit apps.

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• Older apps ('32 bit') will no longer work if you update your Mac to Catalina (the 2019 operating system). Before you update your computer, here's how to see which apps are going to get zapped so.
• The 64-bit column lists whether apps are 64-bit or not. If not, then they’re 32-bit. If you see an app that is 32-bit and it’s one that you rely on, you might have an issue. Either check to see whether the developer is working on an update or simply avoid updating to macOS 10.15 Catalina. That’s only an option in the short term, though.
• Use PowerSuite to check all applications. It supports macOS 10.9 macOS Catalina.
• Once you’ve replace the app, it’s a good idea to uninstall the 32-bit version from your Mac, to free up space and reduce the chance of conflicts. You can do this manually, by going through folders in your Mac’s Library and tracking down every file associated with the app.

So looks like it has started preparing Mac users about the lack of support for 32-bit apps as in macOS High Sierra 10.13.4 Apple has started showing an alert the first time you launch informing users that the “app is not optimized for your Mac”.

It means that you have to either hope that developers will release 64-bit versions of their apps or you will have to find an alternative 64-bit app that offers similar or better features.

How to Check for 32-bit Mac Apps?

How To Check 32 Bit Apps On Mac Os Catalina

If you want to find out if your favorite Mac app is 32-bit or 64-bit, follow these steps:

Step 1: From the Apple menu, choose About This Mac.

Finding 32 Bit Apps On Mac

Step 2: Then click the System Report button.

Step 3: From the system report, scroll down to Software, then select Applications.

Step 4: When you select an app, you will see a field titled ”64-bit (Intel)”. “Yes”indicates 64-bit; “No” indicates 32-bit.

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At WWDC 2017, Apple told developers that macOS High Sierra will be the last macOS release to support 32-bit apps without any compromise. And now with macOS High Sierra 10.13.4 beta, Apple is also notifying users of the imminent change.

EDIT 2nd of September 2019 macOS Catalina will kill your 32-bit apps

In the beta release notes, Apple states: “To prepare for a future release of macOS in which 32-bit software will no longer run without compromise, starting in macOS High Sierra 10.13.4, a user is notified on the launch of an app that depends on 32-bit software. The alert appears only once per app.”

This will not only apply to apps found in the Mac App Store, but also outside 3rd party apps. So if you rely solely on Mac App Store apps, it’s a pretty safe bet that all ( still ) 32-bit apps will be updated accordingly.

But it might be a good idea to be prepared when it comes to apps distributed outside the Mac App Store. Meaning that you might want to contact the developers and see if they plan to update to 64-bit. Or start finding alternatives.

Luckily there’s an easy way to quickly check which apps are 32-bit.

Find 32 Bit Apps Mac

1. In the menu bar go to  > About This Mac

2. Click on “System Report…”

How To Check Bit Size

3. Go to Software > Applications and wait a few seconds for your Mac to compile a list of all your installed apps. Now check the 64-bit header for each app.

• Yes = 64-bit app
• No = 32-bit app