Your text will be reversed simply so that any random person couldn't read it. You can reverse it word by word, full text or substitute a letter in place of another.
This app also has an advanced 3 level encryption feature which uses a key (or password which you enter) to create an encrypted text which can be decrypted only with the given key. The key is not stored anywhere.
You can send this text as normal text through any app (like WhatsApp) and the receiver can decrypt it using this app.
Now you can safeguard your texts with encrypted vault for later use.
Reverse it, encrypt it, store it and share it.