Safari is a web browser developed by Apple Inc. included with the OS X and iOS operating systems. First released as a public beta on January 7, 2003, on the company’s OS X operating system, it became Apple’s default browser beginning with Mac OS X v10.3 “Panther”. The native browser of iOS is also called Safari, but has a different graphical user interface (GUI) and uses a different WebKit version and application programming interface (API). A version of Safari for the Microsoft Windows operating system was first released on June 11, 2007, and supported Windows XP Service Pack 2, or later, but it has been discontinued. Safari 5.1.7, released on May 9, 2012, is the last version available for Windows.