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#1 Signal
Handles group chats, SMS, voice, video, documents and picture messages
Offers disappearing messages (with a timer)
Signal protocol
Open source
Doesn’t store user data or metadata
Advocated by Edward Snowden
Needs a phone number to register
Signal is the overall winner for both iOS and Android users. Signal created an encryption protocol that is now recognized as the most secure messaging app protocol out there. It offers everything most users need – SMS, video and voice calls, group chats, file sharing, disappearing messages, etc – without stuffing the app with ads and collecting user data. It’s also an open source platform so anyone can check it for vulnerabilities (though no one has discovered any yet). Even Edward Snowden, the (in)famous NSA whistleblower, endorsed this app.
The only flaw we found is that you can’t use the app anonymously and need at least your phone number to register. However, we still think it’s the perfect choice for the average user.