Need to take a quick note? Then try Zipnote! Just simply open the app and bam! You are already typing your note! The note saves automatically when you exit the app or click the done button. It's easy to take some quick notes with Zipnote.
This app is excellent as far as "Quick Notes" go! I'm a big fan of the SideNotes app but they don't currently have an iOS companion - while they don't sync, is definitely just as easy to use!
