very good app, actually worth buying
It has password lock, and if you have a google account you can back it all up easily and keep it safe. Many customizing options to choose from, and comfortable to use. Im very picky about these kinds of apps, but this one rocks. Highly recommend. although the lite version should have a larger limit.
Nerdfacelove about
RainbowNote: notebook/diary with photo calendar, v2.9