A free program for Android, by KITTY TAIL.

Notepad with password is a free and convenient Android phone application that allows you to make notes and save them in an encrypted form. After a period of inactivity, this unique app’s feature secures the notes. Moreover, your notes are encrypted before being stored in the app’s database so no outsider can access them. This Notepad app protects your sensitive information with AES 256 encryption, the same standard used by the military. The NSA recommends AES 256 for the safe storage of classified information.  In addition, you may bring in and take out items from your SD card or Google Drive, be they note, pictures, or anything else. There’s a lot to do in this unique app. Check this out now!