In the simplest terms, 32-bit apps are inefficient.ģ2-bit apps can run on a 64-bit system as they've been doing for years, but Apple wants to get rid of outdated apps to make sure everything that runs on the Mac is properly optimized and isn't an unnecessary drain on system resources.Īpple started warning Mac users about plans to end support for 32-bit apps back with macOS High Sierra. Apple technologies like Metal only work with 64-bit apps, and for Apple to ensure that Mac apps include all of the latest advancements and optimizations, support for 32-bit needs to end. Apple has long since transitioned to 64-bit processors and macOS has been 64-bit since the launch of Snow Leopard in 2009.Ĭompared to 32-bit apps, 64-bit apps can take advantage of more memory and offer faster system performance. With the release of macOS Catalina, 32-bit app support is no longer available, which means many of your older apps will no longer work if they haven't been updated to 64-bit.ģ2-bit apps date back to a time when there were 32-bit processors and 32-bit operating systems, but are now outdated.

Apple has been phasing out 32-bit apps for the last 10 years and is now ready to take the final step, even if Mac users may not be ready to lose access to older apps. When macOS Mojave was announced, Apple warned that it would be the last version of macOS that would support older 32-bit apps.

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