About Underpriced AI®
We are a family of thrifters. We kept asking the same question at the thrift store, at estate sales and in our own closets: is this worth selling? So we built the tool that answers it.
What it does
Photograph an item. Underpriced AI tells you what it is and shows what ones like it really sold for on eBay, with the sold listings there to open and check. If it is worth selling, it writes the listing and posts it to your eBay account. From one closet cleanout to a weekly thrift run, it is the tool we wished existed.
Who we are
Frank Kratzer
Founder, builds the app
A software engineer for more than 30 years, with a long background in AI. He builds the app. Items are identified with Anthropic's Claude, and prices come from real eBay sold listings, with specialist sources for categories like records.
Wendy Kratzer
Co-founder, the seller in the family
Years of buying at thrift stores, estate sales and auctions and selling it on. She knows which brands hold their value and what sells fast where, and every feature is something she needed while doing it.
How we check ourselves
Every week we compare our prices with what the items really sold for and publish the result, good or bad, on the accuracy page. What sellers say is on the reviews page, as they wrote it.
Giving back
To people: $252 given to Lions Clubs International and The Michael J. Fox Foundation for Parkinson's Research so far, every gift listed. To the planet: 1% of every payment goes to permanent carbon removal through Stripe Climate. The numbers on the giving page are the only ones we quote.
Where to get it
Plans and what each one costs are on the pricing page.
Talk to us
A question, a problem or an idea: write to us and we answer by email.