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SimpleX uses a collection of servers to handle dispatching of messages, and relies on double-ratchet even for groups. This is high overhead as groups get large, which is why both SimpleX and Signal have caps on group size. It's also limited in features, resulting in relatively low user experience. Quorum is built on Quilibrium, utilizing P2P for transport, although our web application is using an API to facilitate this (messages are encrypted on the client however). The desktop and mobile applications will have optional choice of running a node internally to be strictly P2P. The user experience is much closer to discord, and user identifiers, if you wish to call them that, are derived strictly from keys, meaning needing to compare "security/safety numbers" like on other platforms is unnecessary – it can't be MITM'd without breaking session establishment. Group chats are also unlimited in size, this is possible due to Triple Ratchet, an MPC-based group key ratcheting scheme. 0 reply
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