Gym Website & Cross Platform App

I need a full-stack build that covers both a public-facing website under my own domain and a native-feeling app released on iOS and Android. The heart of the project is workout tracking, so the user flow has to make it effortless for members to log sessions and instantly see their progress charts... (Budget: $30 - $250 CAD, Jobs: Android, Flutter, Full Stack Development, iPhone, Mobile App Development, PHP, React Native, Web Development)