I’m building a multifaceted health app that must run smoothly on both iOS and Android. The core idea is to give users an all-in-one companion where they can track activity, log symptoms, and stay on top of diet and nutrition—so the experience needs to feel cohesive rather than like three separate mini-apps. I’m open to modern cross-platform stacks such as Flutter or React Native, as long as we can tap into Apple HealthKit and Google Fit for step counts, heart-rate data, and other sensor-based metrics. Clean architecture, well-commented code, and a UI that looks native on each platform are essential. Key deliverables: • Full source code in a Git repository • Test builds on TestFlight and Google Play Console • Final store-ready builds with screenshots and icon assets • Brief technical documentation covering setup, libraries used, and how to add new features Once we agree on milestones I’ll provide wireframes and a feature priority list, but the high-level goal is clear: give users a single place to monitor their daily wellness with reliable data sync and an intuitive interface. Let me know your preferred toolkit and any similar projects you’ve shipped, and we can get started.