Native Mobile App from Web

I have a fully-featured web application that already works well in mobile browsers, but I now need a build that feels truly native on both iOS and Android. I will share the live site, the codebase, and a clear priority list so you can focus only on the features that matter most on mobile... (Budget: $250 - $750 USD, Jobs: Android, Flutter, HTML5, iOS, iPhone, Kotlin, Mobile App Development, React Native)