While Cryptical encrypts peer-to-peer messaging, Wickr takes it one step further with deeper encryption and auto delete functions.
Remember the iconic "this message will self destruct in 7 seconds" from Mission: Impossible? Now you can do the same with Wickr. Wickr also deletes meta data from photos and video (those pesky location and time tags) and allows you to permanently delete attachments with a single tap.
Is Wickr a little overboard? For most of us, yes - but if you work in a highly competitive field, or are responsible for security, Wickr may become your best friend.