How We Verify Every Price Drop
Most deal sites calculate a discount by comparing the sale price with the retailer’s list price. Retailers set that list price themselves, and it is often higher than anything the product has really sold for. So a “50% off” tag can mean nothing at all.
PriceDropDaily ignores the list price when deciding if something is a deal. Instead, we compare the current price with the product’s own history.
What we measure
- 30-day and 90-day average — what the product usually sells for, weighted by how long each price lasted.
- 90-day low and all-time low — the best prices on record.
- Change in the last 24 hours — so the home page shows today’s real drops first.
Where the data comes from
Price history comes from a licensed price-tracking data provider and is refreshed several times a day. Every product page shows when its price was last checked. Prices can change at any moment, so always confirm the price on the retailer’s page before you buy.
Why we start small
We track a focused set of categories — electronics, home & kitchen, and tools — rather than every product online. A smaller catalog with accurate numbers is more useful than a huge one with wrong ones.
The verdict rules
Each badge is calculated automatically, using the same thresholds for every product:
| Badge | Rule |
|---|---|
| All-time low | Within 0.5% of the lowest price on record, with at least 60 days of history. |
| Lowest price in 90 days | Within 1% of the 90-day low and at least 5% below the 90-day average. |
| Real drop | At least 10% below the 90-day average. |
| Good, not great | 3–10% below the 90-day average. |
| Fake sale | The retailer claims 15% or more off its list price, but the price is within 2% of (or above) the 30-day average. |
| Wait — normal price | Less than 3% below the 90-day average, or above it. |
| Tracking started | Less than 14 days of price history. |