PriceProven VS JavaScript Tutorial

PriceProven's answer

Most price-history tools cover Amazon. PriceProven covers AliExpress, where the crossed-out was-price on a listing is set by the seller and checked by nobody. We read the listed price of every product we track once a day and store it with its date, then test a seller's discount claim against that record instead of against the seller's own number. We also surface listings from different shops that use the identical product photograph at very different prices - AliExpress does not group those, so which price you pay depends on which listing you happened to open. Every page states what we excluded and what you still have to check on the listing itself: variant, pack size and shipping.

PriceProven's answer

Two honest reasons and one limit. First, coverage: Keepa and camelcamelcamel are excellent on Amazon but do not track AliExpress, and most AliExpress extensions read the seller's own crossed-out price rather than keeping their own record. Second, method: every figure we publish is counted from prices we recorded ourselves, each page states what was excluded and why, and where the data does not support a verdict we say so instead of inventing one. The limit: we are new, so our record is short compared with a tracker that has been running for years. If you need a decade of Amazon history, use Keepa. If you want to know what an AliExpress listing actually cost on the days we watched it, use us.

PriceProven's answer

Shoppers in the US and UK who buy from AliExpress and do not trust the percentage on the badge. Typically someone with a listing already open, about to spend between one and a hundred dollars, who wants to know two things before paying: was this cheaper recently, and is another shop selling the same item for less. They are not researchers and they do not want an account or a browser extension - they want a dated answer in a few seconds. A smaller second group is journalists and consumer advocates who need a source they can cite, which is why our data pages are free to quote with a link.

PriceProven's answer

PriceProven started in August 2026 from a boring observation: nobody checks the crossed-out price on an AliExpress listing. The seller types it in, the badge does the arithmetic, and the number is never tested against anything. There was no dataset to buy that would settle it, so the only way forward was to start writing prices down and keep doing it every day - a discount claim can only be checked against a price somebody actually observed. It is built in Ho Chi Minh City by Khang Tong. It makes no revenue today. The rules we set at the start and have not changed: publish only figures counted from prices we recorded ourselves, state the limits of a method on the same page that uses it, and say "not enough data, no verdict" whenever that is the honest answer.