Dolphin Browser is a proprietary mobile browser for the Android operating system and iOS developed by Mobotap. It was one of the first alternative browsers for the Android platform that introduced support for multi-touch gestures. Dolphin HD uses the Webkit engine and the native platform rendering capabilities, which allows for a small disk footprint. It is capable of running Adobe Flash on Android, but it can have problems with video streaming. Both iOS and Android versions are free without advertising. There is an advanced version called Dolphin Browser HD for Android 2.0 or later. Dolphin Browser Beta was also launched in May 2012 and it is cited as most capable HTML5 browser scored over 450 on HTML5test.com. In October 2011, privacy concerns were raised about Dolphin browser after it was discovered that all URLs loaded in Dolphin HD were being relayed as plain text to a remote server, a process described by Ars Technica as 'an unambiguous breach of privacy'.