Woah, the macOS version looks extremely pretty/native. How is this possible in Rust?
Because it's still HTML/CSS, just using Rust compiled to WASM instead of JS.
There's vibrancy and controls in the title bar.. if it really is HTML/CSS like you say, then I'm impressed. I don't know what it's like to actually use the app, but at a first glance (and subsequent glances) I wouldn't be able to tell it apart from a native app written with, say, SwiftUI.