A paper trading business generates dozens of handwritten invoices every day. Arco Papers uses GPT-4o vision and a LangChain agent to photograph those documents and turn them into structured financial records in seconds, with zero manual data entry.
Launch App →A family-run paper manufacturing and trading business in Islamabad was recording every purchase and sale invoice manually into spreadsheets. Handwritten documents in Urdu and English, multiple suppliers, daily volume. Reconciliation took hours and errors slipped through.
A Flutter mobile client lets staff photograph an invoice. A FastAPI backend passes the image to GPT-4o Vision via a LangChain agent, extracts line items and totals, validates the data, and writes structured records to Supabase. The web dashboard gives the owner a live view of inventory and financials.
GPT-4o Vision
Reads handwritten Urdu/English invoices, extracts line items, quantities, prices.
LangChain Agent
Orchestrates extraction, validation, and database writes in a single pipeline.
Live production
Running on real business data for a paper manufacturing and trading company.
Flutter client
Cross-platform: same codebase runs as web app and on Android.
Backend
Client
Data
Infra
Solo project, end to end. Identified the problem from personal experience with the family business, designed the data model, built the FastAPI backend and LangChain pipeline, wrote the Flutter client, and deployed to Firebase. The app runs on real production data.