Volentix is a multi crypto wallet but the dex just a feature that has already added into the app. This is as eido which has been adding the dex feature on its app too. Volentix is not native dex.
mean they are only wallets? the dex service they provide is not their own, I just heard about Volentix and haven't used it before, it looks like Volentix is less popular because it's still unfamiliar to me, maybe I'll check out Volentix later