Interactive Expense Reporting App

I need a mobile-first finance application that revolves around one core task: effortless expense reporting. The build has to run smoothly on both iOS and Android, so a shared codebase (Flutter, React Native, or a similar cross-platform stack) makes sense, but I’m open to your recommendation as long as the final binaries are App Store and Google Play ready.

An engaging, interactive interface is essential. Think swipe-friendly receipt capture, animated category wheels, and real-time charts that respond instantly as users log purchases. While the visuals should feel lively, the workflow itself must stay intuitive—input, categorize, review, export—never more than a couple of taps away.

Core scope
• Receipt capture from camera or gallery with OCR to auto-populate fields
• Smart categorization and tagging, editable by the user
• Dynamic dashboards: daily, weekly, monthly spend with drill-down animations
• Secure cloud sync and optional offline mode with encrypted local storage
• CSV/PDF export and one-tap sharing to email or cloud drives
• Push notifications or in-app nudges that keep users on track without becoming spammy

Deliverables
1. Production-ready iOS and Android apps signed for release
2. Complete, well-commented source code in a git repository
3. Basic admin or backend script for user data storage (Firebase, Supabase, or a lightweight REST API)
4. Setup/installation notes plus a short video walkthrough of the main flows
5. Two rounds of post-delivery tweaks for polish and bug fixes

Acceptance criteria
• Both apps install cleanly on current OS versions, pass store validation, and show no critical crashes in TestFlight or internal testing on Android.
• OCR accuracy ≥ 90 % on standard printed receipts.
• Dashboard interactions stay below 150 ms on mid-tier devices.
• All exports open correctly in Excel, Numbers, and Google Sheets.

Let me know which framework you’d pick, any previous similar builds you can share, and an outline timeline from kick-off to store submission.