Great app! Very good application. I checked other similar free apps, and hands down choosing this one. All encryption and message exchange is done in one application - forget copy/paste. What is even more impressive it is "all-in-one" type of app - it works with both text messages and e-mails! Thumbs up from me.
1) fixing for 6.0 and higher
2) Contacts encrypting
3) Special merge procedure for contacts data
4) Additional message functionality
5) Material design