About Underpriced AI™
The reseller's edge. Scan items, see real sold prices, list in one click, and track every dollar of profit. Built by a software engineer with 30+ years of experience and extensive AI background, and the thrifters in his family who needed it.
Our Mission
Reselling shouldn't mean hours of manual research. We're a family of thrifters, and the engineering side of the team brings 30+ years of software experience and an extensive AI background. We kept hitting the same question at the thrift store and the estate sale: is this worth picking up? AI makes the answer instant. We built Underpriced AI so flippers can make data-driven sourcing decisions in seconds, list faster, and know their profit on every item. From weekend thrifters to full-time reselling businesses, this is the tool we wished existed.
Who We Serve
Individual Resellers
From weekend thrifters to power sellers. Scan items, track profits, and list on eBay (US, UK, CA, AU, DE, FR, IT, ES, NL, BE) and Bonanza.
From $5/mo
Business Sellers
For serious sellers who want analytics. Revenue reports, category performance, and inventory aging.
From $24/mo with 160 scans
Power Features
For high-volume operations. Inventory tools, business analytics, sale finder, and advanced reporting.
From $24/mo
The Platform
Core Features
- • AI-powered item identification and pricing
- • Real-time market data and comparable sales
- • SEO-optimized listing generation
- • eBay (US, UK, CA, AU, DE, FR, IT, ES, NL, BE) and Bonanza integration
- • Purchase price and profit tracking
- • Background removal tool
Advanced Features
- • Business analytics and reports
- • Inventory tools (tags, locations, bulk ops)
- • Sale Finder for sourcing deals
- • Barcoding and SKU management
- • CSV export and a Schedule C tax report
Available Everywhere
Built by Resellers, for Resellers
Frank Kratzer
Founder & Developer
A software engineer with over 30 years of application development experience and deep expertise in AI and machine learning. He built Underpriced AI to bring enterprise-grade technology to everyday resellers, powered by Anthropic's Claude for item identification and real sold prices from eBay, plus specialist sources for categories like records. No cheap AI shortcuts.
Wendy Kratzer
Co-Founder & Thrifting & Sourcing Specialist
The real-world expertise behind Underpriced AI. With years of hands-on experience flipping items from thrift stores, estate sales, and auctions, she provides the reseller's perspective that shapes every feature. From knowing which brands hold value to understanding what sells fast on each marketplace, her sourcing knowledge ensures Underpriced AI solves the problems resellers actually face in the field.
Giving Back
To people: $226 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.
Get in Touch
Have questions or feedback? We'd love to hear from you.