Learn from receipts
When checkout differs from the shelf, record the reason—such as a loyalty discount, coupon, sale, or markdown.
Personal grocery intelligence
Know what you paid.
Know what to do next.
Pennumi keeps product photos, shelf labels, receipts, and the prices you confirm together—then turns your own history into practical shopping guidance.
See how Pennumi worksIn development for iPhone
Your confirmed price
$0.89
Shelf matched
ProductShelf labelReceipt
Local-first recordsShopping history stays on your iPhone unless you choose to export it.
You confirm the factsAutomated extraction is always a proposal—not the final record.
One record at a time
A pricebook built from real shopping
- 01
Capture what you see
Photograph a product and its shelf label, scan a barcode, or add a receipt.
- 02
Review before saving
Confirm the product, store branch, price, sale terms, and receipt details.
- 03
Buy with context
Compare unit prices, set a personal Buy Price, and see whether a record is receipt verified, shelf confirmed, or getting old.
Built from your own shopping
A pricebook that becomes more useful over time.
Watch what matters
Keep products on a Watch List to see their latest recorded price and your Buy Price at a glance.
Make the practical trip
See one-store and lowest recorded multi-store basket totals, with the extra-stop tradeoff made clear.
Spend with a longer memory
Pennumi helps the details follow you home.
Shelf evidence, checkout results, loyalty prices, and receipts stay connected—ready when you need to understand what you paid, how confident the record is, and what is worth buying next.
Coming to iPhone