For this list, we weren't interested in apps that could be used as notes apps-we only wanted apps that were explicitly designed to be used as notes apps. It's the same with apps: you can write notes in a writing app like Ulysses or throw them in a Google Doc or Gmail draft you can use empty text files or even a sticky notes app.
You can write notes on anything: the back of a napkin, an envelope, a ticket stub, and, yes, a notebook.
