Briar

Secure Messaging anywhere. Peer-to-peer encrypted messaging and forums. Messages are stored securely on your device, not in the cloud. Connect directly with nearby contacts - no Internet access required. Free and open source software.

Install

# Fdroid - https://briarproject.org/fdroid
# Google Play - https://play.google.com/store/apps/details?id=org.briarproject.briar.android
# APK - https://briarproject.org/apk

References

https://briarproject.org/