And an unusual one, too. It is a text messenger, but one writes in it by dictating messages. I do not see the point (if a person is writing, it means that she/he is either busy or does not feel like talking, which is kind of counter-intuitive to talking to your phone), but maybe other people will like it more. What if you want to actually type the message? No can do; Supersonic does not have a keyboard. It does allow the user to change some of the words into emojiis, though. Cool? Messages sent with Supersonic disappear after a while.
If you ask me, messanger sounds like a fancy, but only semi-useful app. What do you think?