Whisper
End-to-end encrypted messaging
Messages, calls, photos and files are encrypted on your device before they leave it, using the Signal Protocol. Group chats use the same protocol, so there's one set of cryptography to trust, not two.
Finding friends doesn't mean handing over your address book. Whisper uses private set intersection, so the server only learns which of your contacts are already on Whisper.
In private testing. App Store and Google Play release coming. usewhisper.net