The sign up process is not very fluid to me. First off, I don't really like password signups in general, but on Android I was able to get auto generated password for the password field but was stuck because the Google password manager didn't recognize the other field as a password confirmation. So I couldn't copy between them and going to a different app to write a long password and going back and copy paste just seemed like too much work.

Esp since I had to write my email already and also pick a username.. why do I need a username for a note taking app?

How about simplifying the on boarding into just email+click link? Maybe also picking a password after you are in?