Finance PWA case study
A mobile-first expense tracker for Serbian fiscal receipts, designed to show where money went by receipt, item, category and household.
Project overview
MoneyWent was created for a familiar personal finance problem: people remember the store total, but not the details that explain where the money actually went. A banking app can show a merchant; it usually cannot show the products inside the receipt.
The product uses Serbian fiscal receipt QR codes as the primary input. Users can scan a receipt, review the parsed items, assign categories and keep a clearer spending history without connecting a bank account.
The MVP also supports manual expenses, household sharing, uncategorized item review, AI-assisted category suggestions, multi-language UI and offline-aware scanning states.
Product flow
MoneyWent is built around the real receipt format people already receive in Serbia. Instead of typing every purchase into a spreadsheet, users can scan the fiscal QR code or paste the SUF link when camera access is not available.
Bank statements show the merchant and the final amount. MoneyWent goes deeper by keeping receipt items visible, so spending can be understood through groceries, transport, coffee, fees and other real categories.
Users can manage categories and subcategories while the product protects system categories that the app depends on. AI suggestions help evolve the taxonomy when similar uncategorized products appear repeatedly.
MoneyWent supports a household model where members can see shared receipts, categories and inbox items. Editing and deletion stay accountable because receipts can only be changed by the member who entered them.
The app starts from RSD and supports currency conversion using NBS middle exchange rates. That keeps the finance experience local to Serbian users while still allowing multi-currency understanding.
MoneyWent behaves like a focused mobile app: installable, dark, responsive and prepared for moments when users need to scan quickly, recover from poor connection or finish the entry manually.
Technical foundation
MoneyWent is implemented as a modern Next.js product with authentication, responsive app screens, browser camera access, PWA behavior and service-worker support for offline-aware interactions.
The product model is centered on receipts, items, categories, households and classification confidence. That structure allows the application to preserve raw spending detail while still producing simple summaries and charts for everyday users.
Build your product
MoneyWent shows how a product can be shaped around a specific market, real user habits and the messy details that generic finance tools usually ignore.
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