Cross-Platform Hostel Management App

I want to run every-day hostel operations from my phone, so I need a clean, dependable mobile app built for both iOS and Android. The basic flow must cover room allocation, check-in/out, and real-time occupancy at a glance, with data syncing instantly between the two platforms... (Budget: $30 - $250 USD, Jobs: Android, App Store Optimization, Flutter, iOS, iPhone, Mobile App Development, PHP, React Native)