32-bit app compatibility with macOS High Sierra 10.13.4 and later

About the transition to 64-bit technology and how it affects 32-bit apps.

Apple began transitioning to 64-bit hardware and software technology for Mac over a decade ago, and all modern Macs now include powerful 64-bit processors that can run advanced 64-bit apps. These apps can access dramatically more memory, enable faster system performance, and take advantage of technologies that define today's Mac experience, such as Metal graphics acceleration.

Apple has been working with developers to transition their apps, and in 2018 Apple informed them that macOS Mojave would be the last version of macOS to run 32-bit apps. 

Apple's transition to 64-bit technology is now complete. Starting with macOS Catalina, 32-bit apps are no longer compatible with macOS. If you have a 32-bit app, please check with the app developer for a 64-bit version.


Opening 32-bit apps

When you attempt to open a 32-bit app, you will see an alert that the app is not optimized for your Mac, or that the developer needs to update it to work with this version of macOS.

Mojave and High Sierra alert: App is not optimized for your Mac and needs to be updated
macOS Mojave and macOS High Sierra
  

Catalina alert: App needs to be updated
macOS Catalina
  

If you haven't upgraded to macOS Catalina, you can still open and use the app, but you should check with the app developer for a 64-bit version that also works with the latest macOS.

 


How to find 32-bit apps on your Mac

System Information can find 32-bit apps that are installed on your Mac:

  1. Choose Apple menu  > About This Mac, then click the System Report button.
  2. Select Legacy Software in the sidebar. All legacy software is 32-bit.
  3. If you don't see Legacy Software in the sidebar, select Applications in the sidebar, then check the list of apps on the right. The column labeled ”64-Bit (Intel)” shows ”No” for apps that are 32-bit.

When upgrading to macOS Catalina, the installer shows a list of recently used apps that are 32-bit. You can review this list before choosing whether to cancel or continue the installation:

Catalina installer window showing list of 32-bit apps

macOS Catalina also shows a prohibitory symbol  over the icon of each 32-bit app in the Finder, letting you know that the app will not open.

 


How to contact the app developer

The easiest way to contact a developer is to look them up on the web. To find the name of the developer of an app, select its icon in the Finder, then choose File > Get Info from the menu bar.

 

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