Interface Builder is a visual design tool used to create user interfaces for Apple's macOS and iOS platforms.
interface-builder is a visual design tool used to create user interfaces for Apple's osx and ios platforms. It is part of xcode, Apple's ide. interface-builder allows cocoa, cocoa-touch and carbon developers to visually compose interfaces for applications. The resultant interface is stored as a xib file (short for XML Interface Builder) and is compiled to a nib file at build time (short for NeXT interface-builder).