Application Kit

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The Cocoa Application Framework, or Application Kit, or AppKit[1] is a collection of classes and protocols within the OpenStep specification and provided by such operating systems as OPENSTEP, GNUstep, and Mac OS X under Cocoa, providing classes oriented around graphical user interface capabilities. An equivalent in Cocoa Touch is the UIKit.


Of the more than 170 classes included in the Application Kit, the following classes form the core:[2]

  • NSApplication
  • NSWindow
  • NSView
  • NSResponder

See also[edit]


  1. ^ AppKit Release Notes for macOS 10.13. Retrieved 23 Oct 2017.
  2. ^ Application Kit Framework Reference. Retrieved 02 Jun 2010.