I've used Kotlin Native around 6 months ago, which seems to be the iOS target for Kotlin Multiplatform. I ended up switching to Go, as much as I didn't want to,

I've used Kotlin Native around 6 months ago, which seems to be the iOS target for Kotlin Multiplatform. I ended up switching to Go, as much as I didn't want to, because of memory leaks when interacting with the official HTTP client (Ktor). The multithreading through coroutines is pretty experimental and unstable. The community is small, and there is not a lot of actually multiplatform Kotlin libraries, although I saw some libraries making progress towards it. I found myself having to write bindings to C libraries a lot. The language is very promising though, it's great with the JVM or JS as target.