Mobile App Development – Real Estate Investment Portfolio Platform (iOS & Android)

I am reaching out to request a detailed proposal and quotation for the development of a mobile application (iOS + Android) for real estate investment portfolio management. The app will be based on an existing web version, but redesigned with a professional look & feel inspired by Apple Stocks (clean, graphical, intuitive). The goal is to combine financial analysis + property management + taxation tools into a single platform. Below is the requested scope, divided into 3 stages: Stage 1 – Objective: Deliver a fully functional mobile app (iOS + Android, single codebase in Flutter or React Native or give me the best option) using the logic of the existing web . Key Features: * User login and account management (email/password, optional social login). * Portfolio dashboard: property list, purchase/current value, ROI, cashflow, performance overview. * New Purchase module: manual or automatic entry of property details + simple ROI/Cap Rate calculation. * Reports: interactive charts (line/area) for portfolio evolution, pie chart for allocation by region. * Documents: upload and view PDF files (contracts, deeds, leases). * Profile: user data and settings. * Initial Tax Module: fields to add basic taxes, fees, and recurring costs per property, to calculate net yield. * Design: dark mode, Apple Stocks style (SF Pro fonts, smooth charts, minimalistic cards). Technical Requirements: * Reuse existing backend if API-ready (REST/GraphQL). * Publish on App Store and Google Play (developer handles submission). * Testing across multiple real devices. Stage 2 – Objective: Prepare the app for monetization, scale, and professional investors. Key Features: * Freemium model: limited free usage (e.g., up to 2 properties) + Pro subscription ($xx/month). * Enterprise plan: for administrators and funds; bulk property uploads, advanced reporting, export tools. * Web admin panel: to monitor users, subscriptions, and platform activity. * Analytics: track user behavior and app performance. Technical Requirements: * Secure and scalable backend (AWS, Firebase, or Supabase). * GDPR/privacy compliance for user and financial data. Stage 3 – AI Assistant + Advanced Features (External Data & Taxes) Objective: Differentiate the app with AI-powered analysis, advanced taxation, and property acquisition tools. Key Features: * AI Chatbot: answers investment-related questions (e.g., “What ROI if I rent this property at $800/month?”). * Automatic recommendations: properties suggested based on location, ROI history, and market trends. * Valuation estimator: input address + size (m²) → estimated price, rental yield, ROI. * New Acquisition Module: integrates external data sources: * Published prices from real estate portals (offer side). * Official documents (public registry reports, where legally accessible). * Manual input of comparables by the user. * Advanced Taxation Module: simulation of property taxes, income taxes, and fees (Uruguay, Argentina as base, scalable to other countries) → ensures net ROI calculations are realistic. * Reporting: clear breakdown of gross vs. net yields. Technical Requirements: * Integration with GPT/AI APIs (variable usage costs). * Infrastructure to process sensitive financial and tax data securely. * Flexibility to adapt to local regulations and data availability. Stage 4 – Maintenance & Support (Ongoing) Scope: * Regular updates for iOS/Android. * Backend and database maintenance. * Technical support for users. * Implementation of new features. Key Differentiators 1. Apple Stocks look & feel → premium, intuitive, investor-friendly. 2. Unique combination of finance + property management + taxation. 3. Freemium model → mass adoption, scalable to professional investors. 4. External data integration → published prices, official documents, user comparables. 5. AI assistant → transforms the app into a “virtual real estate advisor.” Request:
Please provide a detailed quotation in USD, broken down by stage (1, 2, 3), with timelines and deliverables. Indicate any assumptions, third-party costs (APIs, hosting, AI usage), and risk considerations.