It's useful if you want to share code across apps. This is particularly useful for business logic and such, not as much for UIs. The other cross-platform alte

It's useful if you want to share code across apps. This is particularly useful for business logic and such, not as much for UIs. The other cross-platform alternatives are C++ (potentially faster but unsafe by default with footguns galore) and JavaScript (incredibly slow - have to RPC everything into a webview). Rust might also be a good fit for something like this, but I'm not sure what the story is for compiling Rust for Android JNI or with Objective-C/Swift.