Zero mention of cryptography on their blog - yikes!
With tex we care about regular users that need secure conversation with friends and family... if you wanna tell a secret, something that bother you or whatever you talk with friends and family every day in person and maybe you dont want to tell them in a message because he will have your conversation always in his phone and can show anyone... or if the other people is with someone it can show it the conversation immediately....
So tex is a message app that give that privacy you have when you are talking face to face to another person... just the 2 know who they are... and all that you say... it disappears...
What encryption do you use? Where are the messages stored?
We use AES with a static key We never send the user phone number and neither we have it, instead we send a hash.
Even if someone decrypt the message you cant relate to a number or someone cause we don´t have your identity.
Messages are not stored, at the moment they are delivered on the phone its not anymore in our server...
Of course we heard suggestions that can improve the service