Global smartwatch shipments grew an impressive +457% YoY to a record 5 million units in Q2 2015. The market was driven higher by Apple watchOS, which instantly became the world's number one smartwatch platform. Apple's watchOS has been leading mindshare among consumers and particularly developers for some time. Android Wear, Tizen, Pebble OS and other proprietary operating systems are now in the chasing pack Our report tracks global smartwatch shipments and marketshare by OS by quarter from 2013 through Q2 2015. It can be used by device makers, component suppliers, operators, software developers, content suppliers and other stakeholders to determine the size and growth rate of the global smartwatch market.