AdDuplex is a leading cross-promotion network for Windows Phone and Windows Store apps empowering developers and publishers to promote their apps for free by helping each other. Developers insert a single line of code into their apps and start advertising other apps on the network. Those other apps return the favor.More than 3,500 apps actively use AdDuplex to serve more than 25 million ad impressions every day. This makes AdDuplex the leading cross-promotion network and a 3rd biggest ad network on the Windows platforms overall (behind Microsoft and Google only).