I also had an MVP iOS app which was never launched.
The reason I gave up on the project was that no one seemed to be interested. I spent several years looking for customers and collaborators and basically found nothing. The conclusion I came to is that a lot of people complain about the impending end of E2EE but very few people are actually willing to do anything about it except whine.
https://github.com/Spark-Innovations/SC4
It's a bit dated at this point. It doesn't have a ratchet. I did implement one, but never got around to integrating it:
https://github.com/rongarret/ratchet-js
I also had an MVP iOS app which was never launched.
The reason I gave up on the project was that no one seemed to be interested. I spent several years looking for customers and collaborators and basically found nothing. The conclusion I came to is that a lot of people complain about the impending end of E2EE but very few people are actually willing to do anything about it except whine.