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Methodology
A plain-English look at the rules behind every comparison on the site. No jargon, no hand-waving.
We refresh every product, at every store we cover, 12 times a day: roughly every two hours around the clock. Prices are never more than a few hours old, even mid-afternoon when flash sales tend to fire.
Whenever a sale window or multi-buy discount is detected the listing shows when it was last confirmed, down to the hour. Sale cells get an additional validation pass so you are never shown a deal that has already expired.
We currently track fourteen Australian retailers: Coles, Woolworths, ALDI, Chemist Warehouse, Amazon AU, ASN, Supplement Mart, Nutrition Warehouse, Mr Supplement, Elite Supps, Sportys Health, Priceline, Vitamin Direct and The Edge Supplements, plus the direct-from-brand storefronts of every active Australian protein brand. ALDI catalogue specials are included where they are formally advertised.
New stores get added when they cover meaningful catalogue overlap with what is already on the site. We never accept payment for inclusion.
The same product can have a slightly different name at every store. One store calls it “Whey Protein Powder Chocolate 1kg”, another writes “WPC 80 - Choc 1000g”. We line these up by four things, in this order:
If a store sells a slightly different size, it lives on its own listing. That way the cheapest price you see is genuinely like for like. New matches are manually reviewed before they go live.
Every product on the site carries a 1 to 10 value score. It exists so you can scan a page of fifty protein powders and instantly know which ones are priced like genuine bargains and which ones are priced like prestige imports.
The formula is simple and public. We take the cheapest in-stock, recently verified $/100g of product across every store that carries it, then compare that number to every other active product in the same category. A product priced at the cheapest $/100g in its category gets a 10. A product priced at the most expensive $/100g gets a 1. Everything else falls on a smooth curve in between, weighted slightly toward the cheap end so a true bargain stands out.
The five visible tiers map straight to the score:
Categories are compared like for like. A WPI is scored against other WPIs, not against budget WPCs or RTDs. Bars are scored against bars. A 4-pack of yoghurt is scored against other 4-packs. This is the only way the score is meaningful.
The score is computed live from the latest refresh. Every refresh (12 times a day) can move a product up or down a notch as competitors go on sale or stock changes. There is no manual override, no editorial veto, no affiliate-boosted bumping. The score for a product is whatever the maths say it should be at that moment.
For protein powders specifically we also surface cents per gram of protein as a second-line number. A 3kg WPI at $90 with 80g protein per 100g is usually a better deal than a 1kg WPI at $45 with 70g protein per 100g, even though the smaller tub looks cheaper at the top.
We track three prices for every listing. The current price, the recent everyday price (used as the baseline), and the price per 100g of product.
A product is flagged as on sale when the current price is clearly lower than the recent baseline. Small day-to-day price wobbles do not count. We want real sales, not noise.
For protein powders we also calculate $/100g of product straight from the live price and pack size. This is the number serious shoppers care about. A 3kg tub at $90 is usually better value than a 1kg tub at $45 even though the smaller tub looks cheaper at first glance. The product detail page has a cost-per-serve calculator that adjusts for protein-per-serve where the label data is available, so you can also compare cost per gram of protein when it matters.
Stock comes and goes. When a store marks a product as out of stock we keep the listing visible but grey it out and skip it for the cheapest price calculation. You still see what the store was charging last time it was available.
If a product has been out of stock at every store for more than a few weeks, it is moved to the archive and no longer appears in everyday browsing.
Every listing carries a freshness pill that tells you how long ago we last verified the price:
Listings older than 30 days are hidden from rankings and the homepage entirely. Always confirm the live price before you pay.
A single product is one row in our database, no matter how many stores carry it. Each store contributes a price, a stock flag, a buy link, and a timestamp. When you land on a product page you see them all side by side. No duplicate listings, no inflated catalogue counts.
ProteinPrice earns affiliate commission from some of the stores we list, paid by the store when you click a buy link and complete a purchase. It never changes the price you pay. Ranking is algorithmic, based on the cheapest verified price. Commission revenue does not influence the order of results. Read the full affiliate disclosure on our terms page.
