Minigma

Minigma is a dynamic encryption app. It can take single-line messages and encode or decode them based on a password. It is an entirely local app, it does not require use of the Internet or the cloud at all. The messages are not stored in this app in any way nor are they transmitted anywhere, providing peace of mind and security. Do you need to store some sensitive info? Just put a password in the app, and hit the share button to send it to any note-taking app!

How to use it:
You set a password, and put in a message. If you hit "encode" you get a bunch of gibberish. You (or the intended recipient). can then take this gibberish, paste it into the app, type in the same password, and get back that same original message.

The message (decoded or encoded) can be sent using the "Send Message" button through almost any social media service, sent to the clipboard to be pasted later, sent through email, or bluetooth.