http://e55lzoju6enqswtvm66sk3uqukcin3377ehgiorplj4d7qyssipls4yd.onion/en/blog/what-messenger-apps-should-i-use-to-maintain-full-anonymity.php
If you’re a professional who uses Slack to communicate with coworkers, Hushed might be a great addition as one of your messaging tools. Hushed can be activated with one simple command. The user can immediately encrypt messages whenever needed, such as when in a channel accessed by two or more people. The app was first developed in 2013, premised on the need to provide secure messaging for the US, UK, and Canadian markets.