// build_guide
// How to build AuditBook – Apartment Account Management Platform for Auditors
React Native with Expo minimizes cost by targeting both iOS and Android simultaneously, critical given seed budget and no existing team. Supabase accelerates backend setup with built-in auth, real-time DB, and row-level security — ideal for multi-tenant auditor-apartment data isolation. Razorpay is the most reliable Indian payment gateway for collecting society fees or subscription billing, and PostgreSQL handles the double-entry bookkeeping structure cleanly.
Complexity 7/10Mobile App
// recommended_stack
FrontendReact Native (Expo) – cross-platform iOS & Android from single codebase
BackendNode.js with Express REST API
DatabasePostgreSQL (relational structure suits ledger/accounting data) + Supabase for managed hosting
AuthSupabase Auth (email/password + OTP for auditors)
HostingSupabase (DB + Auth) + Railway or Render for backend API
ExtraRazorpay for payments
ExtraPDF generation via pdfkit or react-native-pdf
ExtraTally/Excel import via CSV parsing
ExtraPush notifications via Expo Notifications
// cost_and_timeline
USD min
$6,000
USD max
$12,000
INR min
₹5.0L
INR max
₹10.0L
Typical Mobile App projects cost $7,000–$24,000 USD and take 12–20 weeks with an Indian dev team. See the full cost guide →
// timeline_breakdown
1 weekDiscovery & Design
1.5 weeksAuth, Multi-Tenant Setup & DB Schema
3 weeksCore Account Book & Ledger Features
2 weeksPayments, CSV Import & PDF Export
1.5 weeksAdmin Panel (Web)
1 weekQA, Bug Fixes & App Store Submission
// mvp_features[]
## What to build in the MVP
-Auditor registration & login with OTP verification
-Multi-apartment dashboard – add/manage multiple apartment societies under one auditor account
-Account book management – income/expense ledger entries per apartment
-Category-wise transaction tagging (maintenance, repairs, salaries, utilities)
-Basic financial summary view – monthly/quarterly balance sheet per apartment
-Payment collection tracking – record resident payments and mark status
-Razorpay integration for collecting auditor subscription or society payment gateway
-CSV import for bulk transaction upload (Excel/Tally compatibility)
-PDF report export per apartment (monthly account statement)
-Admin panel (web) – manage auditor accounts, subscriptions, and platform-level oversight
// risk_flags[]
## Engineering risks to plan for
!Multi-tenant data isolation is critical – apartment financial data for different clients must be strictly separated; a schema design flaw here is a serious security and compliance risk
!Accounting accuracy risk – ledger logic (debit/credit, balance carry-forward) must be thoroughly tested; bugs in financial calculations can destroy auditor trust immediately
!No team + ASAP timeline is a dangerous combination – hiring a reliable freelancer or small agency will take 2-3 weeks before development even starts; plan for a realistic 12-14 week total runway
!Seed budget may be tight if scope creep occurs – payments, admin panel, and CSV integrations together add significant complexity; strictly defer non-MVP features to stay within budget
!App Store / Play Store approval for financial apps can take 2-4 weeks and may require additional compliance documentation; factor this into go-live planning
!Razorpay integration for society payment collection may require the apartment society to have a registered business entity – verify this with early pilot users before building
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// related_resources