It integrates with jitsi, which is a fairly good tried and proven solution. Meanwhile, The matrix developers are working on their own implementation of voice and video that plays a bit nicer with their room permission system. For one to one conversations, there is a turn-based solution for voice and video.

I actually find it nice compared to discord. It’s simple. If you need more complex moderation in matrix, there are bots you can use

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Didn’t the Apollo developer say that he was planning on porting his app to the fediverse?