inTouch
inTouch is a private messenger for iPhone and Android. Messages, photos and voice messages are end-to-end encrypted — our server only passes on ciphertext. Your feed brings stories, reminders and small add-ons such as habits or vocabulary together in one place, and inTouch Web lets you continue your chats in the browser.
On Android you can back up your chats, encrypted, to the hidden app folder of your own Google Drive; inTouch has no access to anything else in your Drive. Details in the privacy policy.
