Interface Builder & Instruments

Software development application for Apple's Mac OS X operating system. It is part of Xcode (formerly Project Builder), the Apple Developer Connection developer's toolset. Interface Builder allows Cocoa and Carbon developers to create interfaces for applications using a graphical user interface. The resulting interface is stored as a .nib file, short for NeXT Interface Builder, or more recently, as a .xib file.

Interface Builder provides palettes, or collections, of user interface objects to an Objective-C developer. These user interface objects contain items like text fields, data tables, sliders, and pop-up menu Interface Builder's palettes are completely extensible, meaning any developer can develop new objects and add palettes to Interface Builder.