In a similar move already made in iOS, Apple announced at WWDC that macOS Mojave will be the last update to support 32-bit apps.
The news was shared with developers filling the official keynote announcement. Apple introduced support for 64-bit apps back in 2007 with the release of OS X Leopard and last year’s macOS High Sierra release was the last to support 32-bit apps “without compromise”, according to Apple.
Apple has already started pushing notifications to users running macOS 10.13.4 when launching 32-bit apps. The pop-up warns that the app needs to be updated and optimized by the developer to improve compatibility.
There was no mention as to what the said compromises were, but confirmed that Mojave would officially be the last to support these apps. On the up side, Monday’s announcement revealed a new dark mode, Home app and more for macOS.