E-mail is totally intercompatible, but the experience for anything apart from "the equivalent of letters" is simply horrendous. Delta Chat tries to make e-mail more like a chat app, but it isn't perfect, because e-mail wasn't designed to be a chat application.
XMPP has other massive usability flaws. So does IRC, Matrix, and others.
E-mail is totally intercompatible, but the experience for anything apart from "the equivalent of letters" is simply horrendous. Delta Chat tries to make e-mail more like a chat app, but it isn't perfect, because e-mail wasn't designed to be a chat application.
XMPP has other massive usability flaws. So does IRC, Matrix, and others.