Nice App I downloaded today~ Following is an introduction copied from App Store~ Take a look! 
Have trouble classifying notes?
Have secret notes you want to hide?
Try Note Keeper!
Note Keeper is a new released notes app~
With it, you can add and classify notes easily and quickly.
Besides, Note Keeper offers "Password Protection," "AES256 Encryption," and "Invisible Folder"~ helping u block hackers and peepers
Features:
1.Password Protection:
To prevent unauthorized access to private data, Note Keeper requires a login password.
2.Note Classification:
With Note Keeper, you can organize notes in different folders, saving much time on searching information.
3.Invisible Folder:
In Note Keeper, you can set some folders as invisible folders, and make hidden folders visible again with a special trick.
4.AES256 Encryption:
Data saved in Note Keeper are encrypted. Hackers have no way to invade your privacy.
5.User-Friendly Interface:
Note Keeper is very easy to get started with. Follow your instinct and enjoy Note Keeper!
Have trouble classifying notes?
Have secret notes you want to hide?
Try Note Keeper!
Note Keeper is a new released notes app~
With it, you can add and classify notes easily and quickly.
Besides, Note Keeper offers "Password Protection," "AES256 Encryption," and "Invisible Folder"~ helping u block hackers and peepers
Features:
1.Password Protection:
To prevent unauthorized access to private data, Note Keeper requires a login password.
2.Note Classification:
With Note Keeper, you can organize notes in different folders, saving much time on searching information.
3.Invisible Folder:
In Note Keeper, you can set some folders as invisible folders, and make hidden folders visible again with a special trick.
4.AES256 Encryption:
Data saved in Note Keeper are encrypted. Hackers have no way to invade your privacy.
5.User-Friendly Interface:
Note Keeper is very easy to get started with. Follow your instinct and enjoy Note Keeper!