Congrats on shipping!
Been also building this slowly, mostly assisting my kids.
What they built is Apple-only, since it's a native iOS/macOS app in Swift. It's been a very interesting experience for me, as even capable frontier LLMs still can't write Apple SwiftUI/AppKit properly. They constantly get the bridges wrong, and any feature prompt puts your previous architectural efforts at risk :)
You should ask them to make it work on windows or Linux once they’re done on Mac :) would be a good lesson for them