Nah, raw doggin it with Kotlin and SwiftUI 😎

Yes, this is the way for a superior result.

Expensive for a start up but well worth it down the line

Build it for one platform first and develop it for other platforms at a later time. This keeps expenses to verify low and improve it, before investing in another platform.

Exactly what we're doing. An iOS app (and elixir REST API) to show the product off to investors (we wanna have a live app before talking to anyone) and then we'll expand to Android and Web (probably Phoenix LiveView - bit of a gamble tbf, but worth it imo)