Comment by biozal

You might also want to check out Ditto:

https://www.ditto.com

It’s a local-first platform that supports real-time sync with CRDTs at its core, making conflict resolution much easier to manage. Ditto is designed to handle offline-first use cases and peer-to-peer sync out of the box, so you don’t have to build a custom sync engine from scratch.

It supports a wide range of platforms including Swift, Kotlin (Android), Flutter/Dart, React Native, JavaScript (Web/Node), .NET (C#), C++, Java, and Rust. You can dive deeper into what it offers from the docs site: https://docs.ditto.live/home/about-ditto