A daily electronic version is also available for the Amazon Kindle and iPad. Android and Amazon Kindle Fire versions will follow. Formats for both iPad and Kindle are offered. In June 2010, Amazon released the "Amazon Kindle for Android". These e-readers compete with the Amazon Kindle and Barnes & Noble Nook product lines. The novel is available in Amazon Kindle format. In November 2007, Bezos launched the Amazon Kindle. The volumes are available on digital platforms such as Amazon Kindle and ComiXology.. AZW files debuted with the first Amazon Kindle in 2007. The first generation of Kindle Fire devices run a customized Android 2.3.3 Gingerbread OS. E- readers such as the Amazon Kindle have advanced over the years. Leather became successful in the Amazon Kindle market in 2010. The Amazon Kindle 3 includes an experimental WebKit based browser. Allowed file formats are PDF, EPUB, Kindle (.azw, .kf8) and Mobipocket (.prc, .mobi). Amazon announced an upgraded basic Kindle and the Kindle Voyage on September 18, 2014.