Build a Personal Finance App in 21 Days
Bank account linking, expense tracking, budgets, and financial insights — your Mint, rebuilt right.
Why Personal Finance & Budgeting App development is hard to get right
Plaid integration for bank account linking has a notoriously poor developer experience — real experience matters
Transaction categorization at scale requires ML or rule-based categorization that most freelancers skip
Financial data is hyper-sensitive — encryption, audit logs, and strict access control are non-negotiable
Real-time balance and spending alerts require reliable background job infrastructure, not just polling
What we build — in detail
Bank account linking (Plaid)
Plaid Link for instant verification. Connect multiple accounts (checking, savings, credit). Transaction sync every 6 hours or on-demand.
Transaction categorization
Auto-categorize by merchant name (groceries, dining, transport, subscriptions). Manual override. Merchant logo fetch via Brandfetch.
Budget tracking
Set monthly budget per category. Real-time spend tracking vs. budget. Color-coded progress bars. Alert at 80% and 100% of budget.
Financial dashboard
Net worth tracker, monthly income vs. expenses, spending by category chart, savings rate, and month-over-month comparison.
Bill detection & reminders
Detect recurring transactions (subscriptions, utilities). Surface upcoming bills. Alert on unusual charge or price increase.
Savings goals
Create savings goals (vacation, emergency fund, new laptop). Link to a savings account. Track progress automatically.
Notifications
Push + email on: large transaction, bill due, budget exceeded, account balance low, new paycheck detected.
Tech Stack
- →React Native + Expo (mobile)
- →Next.js (web — optional)
- →Supabase (Postgres + RLS)
- →Plaid
- →Expo Push
- →Resend
What you get
- iOS + Android mobile app
- Full source code
- Plaid integration
- Encrypted financial data storage
Frequently asked questions
Do I need a financial license to build a budgeting app?
No — read-only bank data via Plaid (bank account aggregation) doesn't require a financial license. You're not moving money, just reading transaction data. This is how Mint and YNAB operate.
Free Personal Finance & Budgeting App resources
Download these before you start — no credit card, just your email.
Ready to build your personal finance & budgeting app?
Book a free 30-minute scoping call. We'll map out exactly what v1 looks like, give you a fixed price, and start within a week.
Book a Free Scoping Call →Free · No commitment · Delivered in 3–5 weeks