Building Coach Ivy: Embedding a Unity Avatar Inside a Flutter App

Most nutrition apps feel like spreadsheets with a barcode scanner. Coach Ivy started with a different idea: What if calorie tracking felt less like filling out a form and more like talking to a tiny 3D anime coach who actually reacts to your meals? That single product decision changed the whole technical architecture. A normal Flutter UI was not enough. We needed a real-time 3D character, facial animation, avatar customization, mood reactions, and smooth communication between the app layer and t