http://e55lzoju6enqswtvm66sk3uqukcin3377ehgiorplj4d7qyssipls4yd.onion/en/blog/what-messenger-apps-should-i-use-to-maintain-full-anonymity.php
When a user wants to secure their messages even when they're not with their phone, the app has a feature that detects whether someone else other than the user has tried to access those messages. This feature, together with the password manager that allows the user to store multiple passwords in a single space, helps immensely with the level of security that most messenger apps don't have.