Shout out to Dioxus. It's a react clone that provides a really nice experience and can run a web GUI faster than React can. That's quite the accomplishment given the disadvantage of having to use shims to access the DOM.
If you want to choose a single language that can create native GUI's, Rust is probably your best or only choice. Other languages are lacking a good story for either the web or for iOS but Rust works well on both.
If you want to choose a single language that can create native GUI's, Rust is probably your best or only choice. Other languages are lacking a good story for either the web or for iOS but Rust works well on both.