The telegram app has a very nice interface, but I want to use a self hosted xmpp chat server.
Is there maybe a fork of telegram that makes it work with a self hosted xmpp server? I would imagine that this is possible.
If not, is there anything that at least gets close to how nice telegram UI is?
The “app”, as you call it, only subscribes to the services provided. Whether you know it (apparently not), any features you described are on the server side (as to your post title). You are asking about the server, though you seem to not know it. Why else would you post in “self-HOSTED”. Applications aren’t hosted.
Wow.