America's protein price comparison engine. 249 products, 50 brands, 12 retailers, one transparent Value Score.
ProteinPrice is America's protein price comparison engine. We track 249 products across 50 brands at 12 US retailers, refresh on each scrape cycle, and rank everything by a transparent Value Score so you can see, at a glance, which protein is actually the best deal right now.
Help every American buy protein smarter. No marketing fluff, no editorial bias, no "best of" lists ghost-written by a brand's PR team: just real prices ranked by real value across every retailer we can scrape.
Protein powder is one of the most marketed categories on the internet. Every brand claims to be the best. Every "top 10" list is suspiciously full of the same six SKUs. Sticker prices look cheap until you do the math on protein per serving and servings per tub. We built ProteinPrice because the only honest way to answer "which protein should I buy?" is to compute the answer from live retailer data, in public, on every page.
Concretely, every day, the site does this:
Every product on ProteinPrice has the same scoring engine applied to it. There is no manual ranking, no editorial reshuffle, no "featured deal" override. Here is exactly how the Value Score is computed:
Two products go in, one number comes out. A $30 tub with 20 servings of 20g protein scores (20 × 20) ÷ 30 = 13.3 g/$. A $54.99 tub with 74 servings of 24g protein scores (24 × 74) ÷ 54.99 = 32.3 g/$. The bigger tub is more than twice the value, even though the sticker price is almost twice as high. This is the only number that matters when you're optimizing for grams of protein in your kitchen versus dollars in your bank account.
The whole point of a "best value" site is to be trusted by readers. The moment we sell a #1 spot, we become a billboard, not a catalog. So we don't. No brand has ever paid for ranking, and no brand ever will. Affiliate commissions exist (see How we make money below) but they are paid by retailers on a per-click or per-sale basis and have no effect on which product appears first. Rankings come from the formula, full stop.
Because prices are rechecked on each scrape cycle and the score is recomputed each run, rankings move as new data arrives. A product that's #4 in the morning may be #1 by afternoon if a retailer drops the price. We don't curate: we publish what the math says. This is also why bookmarking "the best whey" is a losing strategy: the right answer changes weekly. Use the live page.
"Best current price" is not whatever number a single scraper happened to return. It's the lowest verified price after several sanity checks (see Quality controls). If iHerb shows a product at $19.99 while every other retailer shows $54.99, we reject the $19.99 as an outlier rather than promote a glitch to the top of the rankings. If two or more retailers independently agree on a low price, we trust it.
The complete methodology: formula derivations, edge cases, how we handle subscription pricing and bundle deals: lives at /how-it-works/.
Live scraped data is messy. Retailers change page layouts. Bundles get listed as single units. Subscribe-and-save toggles flip. A "From $14.99" lure price is not the same as the actual SKU price. The only way to publish prices people can trust is to enforce strict, automated safeguards on every value we ingest. Here is what runs on every scrape:
inStock: false rather than displayed as a current offer. We would rather show "out of stock" than a price we cannot vouch for.price_history-YYYY-MM.jsonl in /data/. The file is never rewritten. It is an immutable record of what we published, when. If we ever change a price, you can prove it.What this means in practice: when a price disappears from a product page, it's usually our safeguards refusing to publish a number we don't trust. We treat "no price" as the safer answer than "wrong price."
ProteinPrice is free to read, free to use, and free to query via the public API. We pay for the servers, the scraping infrastructure, and the time to maintain it through retailer affiliate commissions:
For the full plain-English breakdown of our affiliate relationships: what we earn, how it works, what we will and won't do: see /affiliate-disclosure/.
ProteinPrice is structurally and editorially independent of every protein brand we cover:
Honest data quality requires honest data sources. Here are ours, in order of how much volume they contribute:
User-Agent headers and respect robots.txt.Just as important as what we do is what we don't. We deliberately stay in one lane:
Daily via automated scraping across all 12 retailers we track. Each price carries a per-retailer last-success timestamp so you can see exactly when it was confirmed. Anything older than 48 hours is flagged stale and marked inStock: false rather than being shown as a current offer.
No. We do not accept payment for editorial placement, ranking boosts, or sponsored slots from any brand. We earn affiliate commissions when readers click "View Deal" and purchase at a retailer such as Amazon, iHerb, Bodybuilding.com, MyProtein, Transparent Labs, Muscle & Strength, GNC, or Vitacost. Commission rates have zero effect on rankings: every ranking is generated automatically from the Value Score formula.
Yes. Prices come from live scrapes of retailer product pages: never self-reported by brands. Every scraped value passes through a sanity range ($5–$500), a >50% swing rejection unless 2+ retailers agree, and a cross-retailer outlier check that rejects values more than 30% from the median. Anything that fails is rejected rather than published.
Our safeguards reject unreliable scrapes. If a retailer's price moves more than 50% from the prior value and no other retailer agrees, or if it sits far outside the cross-retailer median, we suppress it rather than show a number we don't trust. If the most recent successful scrape for a retailer is over 48 hours old, that listing is flagged stale and marked out of stock until we re-confirm.
No. ProteinPrice is not a retailer. We don't hold inventory, take payments, or fulfill orders. Every "View Deal" button sends you directly to the retailer's product page, where you complete the purchase.
Our raw JSON feeds: products, retailers, brands, scraper status, price history, and scope: are published openly at /data/. The full API reference lives at /api/docs/. Scraper health is visible live at /scraper-status/.
If you spot a price error, a missing product, an outdated brand fact, or a retailer we should add, please tell us. We read every email.
For data quality issues: a price that looks wrong, a stale listing, a misclassified product: please include the product URL or slug so we can investigate quickly. The append-only price history at /data/ lets us reconstruct exactly what we showed and when, so corrections are usually fast.