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Wickr - Wickr is a free end-to-end encrypted text, video, picture and voice messenger with full sender...
Chadder - Encrypted messaging app
Burn Note - Burn Note is the name of a continuous private messaging utilizing which you can have an ongoing private discussion with your companions or any individual who is at Burn Note.
GrapheneOS - GrapheneOS is an open source privacy and security focused mobile OS with Android app compatibility.
Signal - Fast, simple & secure messaging. Privacy that fits in your pocket.
Earlynote - A time-travelling messaging app