E2EE messenger Wire comes from the people who created Skype and contributed to the royalty-free audio codec Opus (<a href="https://opus-codec.org/" rel="nofollow">https://opus-codec.org/</a>) which now enables WebRTC (used by modern conferencing apps including Zoom, Jitsi, GoToMeeting). They contributed to the IETF encrypted group-messaging protocol MLS (<a href="https://datatracker.ietf.org/wg/mls/about/" rel="nofollow">https://datatracker.ietf.org/wg/mls/about/</a>), which will live alongside TLS.<p>IETF MLS is one step on a long path to messenger interoperability, e.g. Matrix plans to implement MLS. Contributors to MLS include Apple, Cisco and Facebook.<p>Wire does not mandate disclosure of phone number or address book contacts. Their free client has been relatively stagnant for a few years as they focused on business customers, but it was so far ahead of others on usability that it's still relatively current.