Dupe Detective

Receipt scanner for iPhone & Mac

Catch the item you paid for twice.

Scan a receipt and Dupe Detective points out anything that was rung up more than once. The scanning happens on your phone, so your receipts stay with you.

Download on the App Store See how it works

Available for iPhone and Mac. Your receipts sync between them through iCloud.

CORNER GROCERY STORE 0412 · 10/02/26 · 5:47 PM
  1. OAT MILK 64OZ4.79
  2. BANANAS0.78
  3. 1.32 LB @ 0.59/LB
  4. OAT MILK 64OZ4.79
  5. ↑ Rung up twice
  6. SOURDOUGH LOAF5.49
  7. EGGS LARGE DOZ3.99
ITEMS5
TOTAL$19.84
VISA ****4021APPROVED

How it works

Three steps at the checkout line or the kitchen table

  1. Scan the receipt

    Point your iPhone camera at a paper receipt. The app reads each line item and price.

  2. Get the duplicates flagged

    Items that appear more than once are highlighted, so a double scan at the register is easy to spot.

  3. Decide what to do

    If you only bought one, you have the receipt in hand to ask the store for a refund.

Privacy

Your receipts stay yours

Receipts are read on your device. When you sync between your iPhone and Mac, the data goes to your own private iCloud database. We can't open it, and we don't keep a copy on our servers.

  • ScanningOn your device
  • SyncYour private iCloud database
  • Who can read itOnly you. The developers have no access.
  • CameraUsed only when you choose to scan

Have a question first?

Read the FAQ, or see our guides on spotting and disputing duplicate charges.

Read the FAQ Visit the blog