QuickDraw is the 2D graphics library and associated Application Programming Interface (API) which is a core part of the classic Apple Macintosh operating system. It was initially written by Bill Atkinson and Andy Hertzfeld. QuickDraw still existed as part of the libraries of Mac OS X, but had been largely superseded by the more modern Quartz graphics system. In Mac OS X v10.4, QuickDraw has been officially deprecated. In Mac OS X v10.5 applications using QuickDraw cannot make use of the added 64-bit support. In Mac OS X v10.8, QuickDraw support was removed from the operating system. Applications using QuickDraw will still run under OS X 10.8; however, the current versions of Xcode and the OS X SDK do not contain the header files to compile such programs.

A quickdraw (also known as an extender) is a piece of climbing equipment used by rock and ice climbers to allow the climbing rope to run freely through bolt anchors or other protection while leading. The straight gate carabiner is clipped to the protection; a bent gate is used for the rope.