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Threema: proprietary, outside EU

Zulip: lacks encryption, interoperability

Threema is Swiss, which is a regional EFTA member. It's end-to-end encrypted and the clients are open-source.

Zulip has client-server encryption, which is fine if you control the server.

Threema is still vendor lock-in.

Wasn’t Threema sold this week or something?

Not sure what / if that changes anything, but presumably it will… sometime…

Why would they need encryption? Does the european commision have anything to hide?

Chat control for thee but not for me?