I tried to use it a couple of years ago and found it to be highly unstable and barely usable.

I will revisit Cwtch one day, but not with anything mission critical yet. Interestingly the developers announced on SimpleX, not Cwtch, that they planned to undergo a security audit by Trail of Bits in early 2025.

2025 is nearly over and there has been no public report of a completed third-party security audit.

Due to the experimental nature of the app and the fact that they still haven't had—much less passed—a formal third-party security audit, so...