The Wikipedia App is the official app of the Wikipedia online encyclopedia for mobile internet devices developed by the Wikipedia Foundation. As of 2015, it works under operating systems: Android (distributed via Google Play), BlackBerry (via ), IOS (via ) and Windows 8 (via Microsoft Store). The Wikimedia Foundation also released the official Wikimedia Commons application for uploading graphic images to Wikimedia Commons. At the same time, in addition to official applications, independent developers have released a large number of unofficial applications for Wikipedia reading, some of them download data directly from the Wikipedia site, other applications use the MediaWiki API.