WHEYPROOF

Transparency

How It Works

The path from a price to a deal.

  1. Official stores

    We collect current prices from brands' own stores and from retailers.

  2. Checked every day

    Prices are refreshed automatically and saved to each product's history.

  3. 30-day price history

    The highest price in the last 30 days becomes the reference.

  4. Verdict

    We compare today's price with the product's own history.

The decision

Is today's price below the reference price?

The reference price is the highest price we've seen for the product in the last 30 days. The brand's own "sale" label is not part of this calculation.

Yes

Real discount

If the product really got cheaper against its own price history, it joins the deals list.

No

Not a real discount

Even if the store says "sale", a product that isn't below its reference price stays off the list.

Principles that don't change

Coupons are checked by hand

We don't scrape coupons automatically; we check each one works before publishing it.

Ranking isn't for sale

Affiliate links and commissions never change the order products appear in.

Missing data isn't guessed

Fields like stock and price per serving only appear when a reliable source provides them.

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