Apple Inc. invented the iPad as a brand of iOS and iPadOS-based tablet computers. It is the successor of the Newton MessagePad and a pre-production version of the PowerBook Duo-based tablet computer. The iPad was conceptualized by Apple before the iPhone, however, the latter was created and released sooner. Prior to its unveiling on January 20, 2010, rumors about the original iPad began in 2002 and focused on its development, operating system, and availability. The original iPad range is comprised of four models, including the iPad Mini, iPad Air, and iPad Pro. It was first released with the iPhone's iOS operating system, which was eventually forked into iPadOS with improved hardware support and a user experience tailored to the larger screen. The original iPad model earned positive reviews for its software and was named one of its most influential inventions in 2010.