This might be the best app in ages. It’s seamless. Works on iPhone and iPad.
“Just to recap, Write for Dropbox is a text editor and note-taking app that offers an incredibly quick and elegant way to jot down notes and share them on the fly.
By default, all your messages are saved to Dropbox and, whenever you want to start a new note, you simply hit the plus symbol at the top of the screen and your current message will be saved automatically. If you need to quickly return to it, a swipe right reveals a list of all your synchronized notes, and you can also long-press any message to view a preview of its contents, which is particularly useful.”
Workplace Learning in the Digital Age 