Between 20, Apple maintained a Windows version, but abandoned it due to low market share. At that time, Safari was the fastest browser on the Mac. It has been included with the iPhone since its first generation, which came out in 2007. Safari was introduced in Mac OS X Panther in January 2003. It is built into Apple's operating systems, including macOS, iOS, iPadOS and their upcoming VisionOS, and uses Apple's open-source browser engine WebKit, which was derived from KHTML. Safari is a web browser developed by Apple.