Color Note is a popular note taking app. Very light and simple to use.
It is a quick and simple note-taking tool for notes, memos, emails, to-do lists and much more. Taking notes is just like typing into a basic wordprocessing program – just type as much as you want, select a color to the note, share or even set a reminder for the note. In the to-do list mode, you can make a checklist of various to-do items, and tick them off, one by one when each of the items gets done.
You can view the notes in the traditional ascending order, in grid format, or by note color. You can even password protect important notes and put them as sticky notes on your home screen. Online backup and sync cloud service is available which also allows you to share your notes across devices.
A simple app with many uses.