Sometimes you just need a place to jot down a quick note or draft an email or text on the fly. Write your draft and immediately copy or share to another app. When you come back, keep working or delete the note and start over.
Functional, minimalist. and easy with markdown support. Less is more sometimes--the best in its category, in my opinion. Downside is it doesn't look like it's being supported anymore. (Still working like a charm though!)