MacOS Catalina

macOS Catalina, or macOS 10.15, is a version of macOS that was released on 7 October 2019. It was announced on 3 June 2019 at WWDC. The version drops support for devices that can be updated by replacing the graphic cards from OpenGL to Metal, as well as support for 32-bit macOS applications. It is the first version of macOS to support only 64-bit applications and also the final version of macOS to use the major version number of 10. Most builds of Catalina were compiled for x86_64 (for public use) and ARM64 (for testing purposes for the transition to Apple Silicon, which would continue until the announcement in 2020). It is the first version of macOS to fully drop support for OpenGL compositing in the compositor library (SkyLight.framework).

New features and changes

 * Sidecar, iPad-based screen mirroring
 * Project Catalyst, iOS subsystem for macOS
 * Siri Shortcuts
 * Window Snapping
 * Music, Podcasts, and Apple TV, replacing iTunes
 * iOS device integration in Finder
 * Apple Arcade
 * Voice Memos
 * Automatic dark mode
 * Support for Intel Ice Lake, Comet Lake-S, Cascade Lake-W processors and support for Intel Ice Lake iGPU and AMD Radeon RDNA1 graphics cards.
 * zsh as the default shell
 * Removal of Dashboard
 * Removed the ability to add Backgrounds in Photo Booth
 * Read-only System Partition