Briar
About
"Briar is a messaging app designed for activists, journalists, and anyone else who needs a safe, easy and robust way to communicate. Unlike traditional messaging apps, Briar doesn't rely on a central server - messages are synchronized directly between the users' devices. If the internet's down, Briar can sync via Bluetooth or Wi-Fi, keeping the information flowing in a crisis. If the internet's up, Briar can sync via the Tor network, protecting users and their relationships from surveillance." [1]
Translate Briar
Contact
References
[1] [Google Play Store https://play.google.com/store/apps/details?id=org.briarproject.briar.android]