I’m building a teen-focused flash-cards application and want a single codebase that ships cleanly to both iOS and Android. All decks will centre on Math, Language learning and Science, so the interface should let users switch among those topics effortlessly and jump straight into a study session. The core flow is simple: pick a subject, flip through cards, mark answers right or wrong, and view instant feedback that keeps teenagers engaged without extra taps. I’ll supply the card content; your job is to structure the data, design the screens, wire up any local persistence and hand back a polished, store-ready build I can submit to both App Store and Google Play. Deliverables • Complete cross-platform project (Flutter, React Native or similar) with clean, well-commented source • Compiled iOS .ipa and Android .aab / .apk builds ready for upload • Brief README covering build steps and any third-party packages Once the final builds install smoothly on test devices and all three subject decks display and track correct / incorrect answers accurately, the project is done.