Noteshelf is described as 'Take beautiful handwritten notes or annotate PDFs on your iPad, and now even on your iPhone. With the new Noteshelf you can do all of the familiar, like type notes, record audio, draw shapes, sketch, sign contracts, fill forms, along with a lot of new, like add bookmarks, create' and is a Note-taking tool in the audio & music category. There are more than 50 alternatives to Noteshelf for a variety of platforms, including iPad, iPhone, Windows, Android and Mac apps. The best Noteshelf alternative is Notesnook, which is both free and Open Source. Other great apps like Noteshelf are CherryTree, Trilium Notes, Cryptee and Linwood Butterfly.