Paperback is described as 'Simplifies the way you take notes without sacrificing the features you need. Easily take, organize and secure your notes in a beautifully designed user interface. Add photos, reminders and sub-notes with just a few taps' and is a Note-taking tool in the office & productivity category. There are more than 25 alternatives to Paperback for a variety of platforms, including Android, iPhone, Windows, Mac and iPad apps. The best Paperback alternative is CherryTree, which is both free and Open Source. Other great apps like Paperback are Cryptee, Omni Notes, GitJournal and Passfindr.