5. Wickr Me
Rating: 4.35
The people who made Wickr Me are so sure about their app that they are offering $100,000 to whoever finds a bug or security flaw in it. With Wickr Me you can set the expiration time for all your sent messages. After the time runs out, the message is deleted. Another neat function is “Shredder,” which enables you to wipe out all data from your phone irreversibly.
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