We're well into the process of converting the Messaging app included in GrapheneOS into a modern app. We'll be making a new release later today with a completely overhauled user interface written in Android Compose. We've made a massive amount of other improvements and bug fixes beyond that too.

In the longer term, we plan to add support for RCS including support for the standard end-to-end encryption (E2EE) via Messaging Layer Security (MLS). Currently, RCS including E2EE is available on GrapheneOS via Google Messages. We want to avoid the need to use Google Messages for RCS eventually.

RCS on Android is currently implemented with code across the OS, Google Messages and Google Play services. Our plan is to start by making an equivalent to the portion in Google Messages. It would initially require sandboxed Google Play for RCS activation, etc. but we want to plan that portion too.

RCS isn't an open platform in practice. It isn't even as open as SMS/MMS. It heavily depends on proprietary Google and carrier infrastructure in practice. We can start by replicating Google's approach and then we can work on only using carrier services for carriers where it's actually supported.

We're also going to be overhauling or fully replacing the rest of the AOSP apps in the near future. AOSP Gallery is incredibly outdated and is being entirely replaced. AOSP Keyboard may be similar. We recently hired a bunch of new people and will be hiring more so our progress will be accelerating.