I don’t think they are comparable. Discord is built around communities (servers) with text and voice chats in one place, while Matrix is more about personal and group text chats. Spaces do exist in Matrix but they are not so convenient and there are no voice chats. I’d prefer Matrix for personal communication and Discord-like platforms for big thematic communities.

Just tried out their official Android app. Doesn’t seem vibe-coded at all. Very stable and high guality experience. Also the project began in 2023 (or even earlier) when LLMs were arguably still to weak for writing functional code, so at least it didn’t start as a vibe-coded project.

Any vibe-coded parts?