TopNotes is described as 'Powerful app for handwriting and organizing notes, sketches, diagrams, illusions and drawings. It the easiest-to-use and going to be the best-selling handwriting app for iPad. With TopNotes you can take notes, keep sketches, record ideas and draw pictures' and is a Note-taking tool in the office & productivity category. There are more than 10 alternatives to TopNotes for a variety of platforms, including Android, iPad, iPhone, Windows and Android Tablet apps. The best TopNotes alternative is CherryTree, which is both free and Open Source. Other great apps like TopNotes are Cryptee, Passfindr, Noteshelf and Notability.