It's a hardened Signal fork with passphrase encryption for the message database, better notifications on devices without Google Play and support for pairing your messages to multiple devices. If you use Signal I strongly recommend it. It's available in Accrescent so there is a root of trust between GrapheneOS -> Accrescent -> Molly.

Molly for normies and Simplex with its encrypted DB for everybody else. What are you currently identifying as Graphenes weak spots? What about the underlying reliance on proprietary hardware. How do you perceive the future and how can we contribute to funding it?