This app was mentioned in 10 comments, with an average of 1.10 upvotes
reddit linked two apps wrong. here are the correct links.
App for taking notes click here
App for managing your expenses click here
Notes app is excellent, has everything you ask for, encrypts the notes and all features are available in the free version
This is my preferred one:
https://play.google.com/store/apps/details?id=nl.jacobras.notes&hl=en&gl=US
It migrates between devices very easily, and has all the features I need.
I don't know if this is helpful, but there are some apps that let you take notes in a simple format and you can even back them up if you have Dropbox.
The one I use is called Notes and it's easy to use.
I'm happy with Notes for Android.
If you prefer a non google solution, i can recommend Notes by Jacob Ras. It works very stable and it has a clean and eyefriendly look. I use it because you can access your notes from any computer via browser too and syncs very well over the devices.
If you are interested in other cool apps I have tested on my own, you can have a look on this app channel
Notes : https://play.google.com/store/apps/details?id=nl.jacobras.notes should cover your needs.
https://play.google.com/store/apps/details?id=nl.jacobras.notes
This might serve your purpose.
Notes. A bit bare bones, but it syncs across devices seemlessly via Dropbox and does everything else I need.