How to Actually Know if a Grocery Price Is Good

Supermarket prices move constantly, and almost nobody can say what they last paid for a jar of olive oil. That's not a memory failure — it's that the information was never written down anywhere. Which is why “is this a good price?” is one of the hardest questions to answer while standing in the aisle.

Why price-comparison apps disappoint

Apps that promise live prices across every store run into the same wall: retailers don't publish reliable, current, per-store prices, and scraped data goes stale within days. The result looks authoritative and quietly misleads — a “$4.99 at your store” that hasn't been true for a month is worse than no number at all.

The comparison that's actually true

There's one price history that's always accurate for you: your own. What you personally saw, in the shops you personally visit, at the sizes you personally buy. It takes a few weeks to become useful, and after that it beats any national average, because it reflects your stores and your basket.

Three habits that make it work

• Record the unit price, not the shelf price. “$4.99” is meaningless across a 340 g jar and a 500 g one. Price per ounce or per 100 g is the only number that compares. US shelf tags print it; elsewhere it's simple division.
• Log what you see, not just what you buy. The item you didn't buy is exactly the comparison you'll want next month.
• Check the date, not just the discount. A markdown on something that expires Thursday is only a saving if it's cooked by Thursday.

What the label tells you beyond price

Cheap and good aren't the same question. The ingredients list answers the second one: how processed it is, whether sugar or palm oil leads the list, how much sodium a serving carries. Both questions are answerable from the same photograph.

Where iwant2eat fits

iwant2eat's shopping list has a camera button. Photograph a product — or just its shelf tag — and it reads the label, works out the price per unit, and compares it against every price you have seen before: “cheapest you've seen”, or “18% more than you paid at Costco on Jul 3”. It flags ultra-processed items and reads the use-by date, so a bargain with two days left gets called out. The store is filled in from your location, every scan is remembered whether or not you buy, and the price history belongs to your household. We don't invent typical market prices — the only prices quoted back to you are ones you actually saw.