You can use it to codify information that you need to hide. Just you will be able to read it (password to remind, credit card numbers...)
It's very usefull when you want to send messages you know somebody can read instead of your original receiver. So that messages will be understood just by people you want to.
You can also send messages in a safety way.
Just the fact of having to decode a message will avoid problems with anyone that could be reading reciever's screen (that busybody will think the message is wrong). I think you know what I mean...
However you can just use it like a romantic comunication media with your couple.
Very simple usage. Just write what you want to encode or copy what to decode and select the corret option.
It's a young application and It has to improve as soon as a possible with different kinds of encodings and other settings.
Just wait for new updates!