Product Detector is a free Chrome extension that recognizes the product you're looking at on any shopping site and shows you live prices from other major retailers — without leaving the page.
Install (coming soon) How it worksReads structured data (JSON-LD, microdata, schema.org) and common patterns to identify the item — name, price, brand, GTIN, ASIN.
Queries Google Shopping to surface the same item on Amazon, Walmart, Target, Best Buy and other established stores.
Detection happens in your browser. The only thing sent to our backend is the product identifier needed to run the comparison.
No sign-up, no profile, no autoplay videos or pop-ups. Just a small badge on shopping pages and a popup when you want it.
Amazon, a Shopify store, anywhere with a real product listing.
It reads the page's structured data and common markup to extract the product name, brand, price, and identifiers like GTIN or ASIN.
The popup queries our comparison service (a small Cloudflare Worker) which asks Google Shopping for matching listings on other retailers.
A short list, cheapest first. Click any result to open the retailer's product page in a new tab.
Yes. The extension is free and we don't sell user data. The project is funded by retailer affiliate commissions on outbound clicks — see the affiliate disclosure for details.
It works on any page that publishes basic product markup, which covers most major retailers (Amazon, Walmart, Target, Best Buy, large Shopify stores, and many others). If a site obscures its product data, detection may fail — please report it.
Only what's needed to run a comparison: the detected product name, brand, and identifiers (GTIN/ASIN). We don't collect your browsing history, your identity, or anything you didn't view a product page for. See the privacy policy.
Detection runs once per page and takes a few milliseconds. The comparison request only fires when you open the popup — not on every page load.
Honey injected affiliate tags into your existing checkout sessions, often replacing other creators' tags without telling anyone. Product Detector doesn't do that. It only attaches affiliate tags to comparison links that we show you to other retailers — never to the retailer you were already on. We disclose this openly.
The Chrome Web Store listing is on its way. In the meantime you can install the development build from source — instructions are in the project repository.