This app was mentioned in 2 comments, with an average of 1.00 upvote
Have you used Tor browser before? Peer-to-Peer encrypted
Chat.Onion
>http://onionapps.github.io/Chat.onion/
I've written one...
https://play.google.com/store/apps/details?id=onion.chat
http://onionapps.github.io/Chat.onion/
https://github.com/onionApps/Chat.onion
Each user running their own hidden service & all messages sent through Tor.