Notefile:
Notefile lets you make quick notes and view them quickly, on all your devices. It’s available as a Mac app and a universal iOS app for iPhone, iPad, and iPod touch. Your notes sync automatically with iCloud, or our own Junecloud sync. Our Mac app can show in your Dock or your menu bar, and it’s a compact window that stays out of the way.

More information:
Notefile for iOS: junecloud.com/software/iphone/notefile.html
Notefile for Mac: junecloud.com/software/mac/notefile.html