Zaster
AI-powered construction invoice verification tool — automatic comparison of bill of quantities, site measurements, and invoices using Azure Document Intelligence and OpenAI.
The Problem
In the construction industry, invoice verification is a tedious, error-prone process. Project managers must manually compare bills of quantities (BoQ) with site measurements and cross-check them against submitted invoices — a process that can take hours on complex projects.
The Solution
Zaster automates this process with AI. The tool extracts data from the BoQ, site measurements, and invoices, compares them automatically, and flags discrepancies. Errors and inconsistencies become visible immediately, before an invoice is approved.
How It Works
- Document Upload: BoQ, site measurements, and invoice are uploaded as PDFs
- AI Extraction: Azure Document Intelligence recognizes and structures data from the documents
- Intelligent Matching: OpenAI models compare line items, quantities, and prices across all three documents
- Audit Report: Discrepancies and potential errors are presented in a clear overview
Technical Highlights
- Azure Document Intelligence: Precise extraction of tables, line items, and amounts from construction PDFs
- OpenAI Models: Semantic matching of BoQ positions with measurements and invoice items
- React Frontend: Intuitive interface for upload and verification views
- Convex Backend: Reactive backend with real-time updates and serverless architecture
- Landing Page: Marketing website to showcase the tool
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