Rdio is an ad-free music subscription service available in the United States, Canada, United Kingdom, France,Germany, Brazil , Australia, Spain, Portugal, Denmark, Estonia, Finland, Norway, New Zealand, the Netherlands, Belgium, Mexico, Malaysia, Hong Kong, Colombia, Chile, Czech Republic, Switzerland and Poland. It is available as a website and also has clients for the iPhone, iPod Touch & iPad, Android, BlackBerry, and Windows Phone mobile devices, which can play streaming music or cache songs for offline playback. There are also clients for the Roku and Sonos systems. The web-based service also offers a native desktop client application for Mac OS X and Windows. Its library has content from the four major record labels, as well as the Merlin Network and the aggregators IODA, INgrooves, The Orchard, CD Baby, IRIS Distribution, BFM Digital, Finetunes, and Catapult. Rdio also offers social networking, allowing users to share playlists and follow others to see what music they listen to.