Dupe Detective
For retailers and deal sites
Pricing errors cost more than the refund
A shopper who finds a double charge at home doesn't just want their money back. They start to trust the store less. Dupe Detective helps shoppers catch the mistake at the counter, while it's still a one-minute fix.
What shoppers say
- 71% would switch to another retailer because of repeated pricing errors.
- 43% would shop at that store less often, and 26% would spend less there.
- One in four say they're overcharged at checkout at least monthly.
Why the timing of the catch matters
Every store makes pricing mistakes. In 2024, 23% of government price inspections at U.S. stores failed the accuracy standard. What decides whether a mistake costs you a customer is when it's found.
- Caught at the register: the cashier voids the line, the shopper sees it fixed, and they leave satisfied. It takes a minute.
- Found at home: the shopper has to call, drive back, or dispute the charge with their bank. The store becomes the place that cost them time and money.
Dupe Detective moves the catch to the counter. Shoppers scan their receipt in a few seconds before they leave, and any item rung up twice is highlighted so it can be fixed on the spot.
For grocery stores and retailers
A mistake fixed at the service desk is a customer kept. Shoppers who can quickly check their receipt are less likely to find an error days later and blame the store. Recommending a receipt check shows confidence in your pricing, and backs up any pricing-error policy you already have.
For coupon, cashback and deal sites
Your users work to find the best grocery deals. A double-scanned item at the register can cancel out those savings, and the frustration lands on the whole experience. Pointing your users to a tool that protects the savings they found with you gives them one more reason to come back.
It fits naturally into a newsletter tip, a deals page or a savings guide.
How Dupe Detective works
- Shoppers scan a paper receipt or import a digital one on iPhone or Mac.
- Items that appear more than once are highlighted in seconds.
- Receipts are processed on the shopper's device. Nothing is uploaded to our servers.
- It works with Costco, Kroger, Fry's, Sam's Club, Walmart and most major grocery stores.
- Shoppers can try it free: 3 free scans, then a 7-day free trial. After that it's $4.99 a year.
Get in touch
Want to mention Dupe Detective to your shoppers or users, or talk about working together? Email Marcus Chaffee, the founder, at [email protected]. You can also try the app on the App Store.