Mobile messaging is the hot topic of this year — thanks to a few big acquisitions — but what can help a contender from standing out from the rest of the field? How about a privacy button that_permanently_removes all traces of a conversation with a single click? That’s the formula behind Wiper, a new messaging app for iOS and Android that takes the simple aesthetics of WhatsApp and Telegram and adds a_button that, quite literally, wipes messages_from the sender’s phone, recipient’s phone and the company’s own servers in seconds. “Whether it’s WhatsApp, SMS, Facebook, Google or email providers, we’ve found...

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