Folders is an advanced iOS client for Box, Dropbox and Google Drive. Flip PDF pages like a book, preview it with thumbnails, search content, write notes, headline comments, adjust the brightness. Open all your documents whether it'sMicrosoft Word,, Excel, Powerpoint or Google Docs. Folders was developed by Martin Destagnol.In May 2013, Folders was acquired by Box. The valuation of Folders was undisclosed. Other terms of the deal were not released.