Lots of people have items lying around that are worth money, but they are too time constrained to research what each one is worth, list it on eBay, and package and ship it out. It's why garage sales exist, and also why lots of items go to waste. This creates great inefficiency.
Worthwise is an iOS app where anyone can provide pictures and a description of an item, and have AI identify it, diagnose its condition based on the photos, and do market research across eBay and the wider web to find out how much it's worth. If the user has a connected eBay account, they can then list it to the site in one click.
- Designing a multi-pass AI system that first accurately identifies what an item is, then diagnoses its condition from the photos, before any pricing happens.
- Grounding valuations in real data: the backend combines the eBay API with web search to pull comparable listings, so the estimate reflects the actual market rather than a model's guess.
- Making the backend provider-agnostic: it runs on either Anthropic Claude or Google Gemini through a single configurable setting, with an auto mode that picks based on which API key is present.
- Building the iOS camera experience in Swift around a camera manager that strictly separates camera-queue state from main-actor UI state.
The app is SwiftUI on iOS with a FastAPI backend in Python, and it shipped on the App Store.
