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A Whatsapp clone that is client/server with cloud syncing by default, but has a local 'secret chat' function that is end-to-end encrypted. The latter should negate any snooping, unless the custom built encryption protocol is compromised. This HN thread raises some concerns over that.

All things considered, I think this one seems to have a shot at replacing Whatsapp as a secure messaging alternative.

Edit: Telegram now issued a cracking contest, which again raised the concern of some HN'ers.