What are some alternatives?
When comparing MagicPad and Keepsafe Unlisted, you can also consider the following products
MyChat - Secure instant messenger for any network
Secret for iMessage - Send secret messages that self-destruct in iMessage.
Send - Instant messaging meets email (by Microsoft)
Burner Mail - One-click burner email addresses that you can use when signing up on websites to protect your identity and prevent your personal email address from being sold or spammed.
Signal - Fast, simple & secure messaging. Privacy that fits in your pocket.
WING - A phone carrier that is actually nice to you.