Rhea

A study in AI-assisted development — a receipt-scanning app built entirely through conversation with Claude.

macOS 14+ · runs fully local · archived

Archived. Rhea was a deliberate experiment in AI-assisted software development. It was designed, specified, and written primarily through conversation with Claude. The code is functional but rough — it's a case study, not a product. Don't rely on it as your only copy of receipt data.

Drop in receipt PDFs, review each extraction next to the original scan, confirm it, and export to CSV or Postgres. Extraction runs against your own local vision model (LM Studio, oMLX, or anything else that speaks the OpenAI chat-completions API) — nothing leaves your machine.

This project demonstrates what's possible when a developer iterates closely with an AI coding assistant over the course of a project — from architecture decisions to bug fixes to feature additions, all through conversation.

Build from source #

Rhea is a native Xcode macOS App project generated by XcodeGen from project.yml (the source of truth — Rhea.xcodeproj itself isn't committed).

brew install xcodegen
xcodegen generate
open Rhea.xcodeproj

Then hit Run in Xcode, or build/run from the command line:

xcodebuild -project Rhea.xcodeproj -scheme Rhea -configuration Debug -derivedDataPath build build
open build/Build/Products/Debug/Rhea.app

See AGENTS.md for architecture and internals.

Run tests #

xcodegen generate
xcodebuild -project Rhea.xcodeproj -scheme Rhea -destination 'platform=macOS' test

This runs both RheaTests (unit, Swift Testing) and RheaUITests (XCUITest) headlessly.