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 an app in the Office & Productivity category. There are more than 50 alternatives to Paperback for a variety of platforms, including Windows, Android, iPhone, Online / Web-based and Mac. The best alternative is Joplin, which is both free and Open Source. Other great apps like Paperback are Standard Notes (Freemium, Open Source), Google Keep (Free), Evernote (Freemium) and CherryTree (Free, Open Source).
Joplin is a free, open source note taking and to-do application, which can handle a large number of notes organised into notebooks. The notes are searchable, can be copied, tagged and modified either from the applications directly or from your own text editor.
Colorful & powerful sticky notes app for Windows & Phones. Set reminder alarms, attach them to any website or document, organize them using folders/tags, sync sticky notes between devices & send notes across LAN or to any contact across the globe.