Frequently Asked Questions

PriceLens is a free Chrome extension that automatically compares prices across Amazon, eBay, AliExpress, and 7+ more stores — the moment you open any Amazon product page. No searching, no clicking. It also shows 90-day price history so you know when a "deal" is real.

Yes, 100% free — and it always will be. PriceLens was built on the principle that saving money should never cost money. There is no premium tier, no subscription, no hidden fees. The full extension with all features is free for every user.

Currently PriceLens compares prices from: Amazon.es, eBay.es, AliExpress, Decathlon, Fnac, El Corte Inglés, PCComponentes, MediaMarkt, Wallapop, and Google Shopping results. We are constantly adding more stores.

Yes! PriceLens works on Amazon.es, Amazon.com, Amazon.co.uk, Amazon.de, Amazon.fr, and Amazon.it. The local store comparison (Fnac, El Corte Inglés, etc.) is currently focused on Spain, with expansion to other European countries planned.

1. Click Add to Chrome — Free on this page.
2. Click "Add extension" in the Chrome popup.
3. Visit any Amazon product page.
PriceLens activates automatically — no setup, no account needed.

PriceLens is currently a Chrome extension. It also works on Brave, Edge, and other Chromium-based browsers that support Chrome extensions. Firefox and Safari support is on our roadmap.

No account required. Install the extension and start saving immediately. An optional account will be available in the future for syncing price alerts across devices.

When you open an Amazon product page, PriceLens reads the product title and ASIN (Amazon's product ID). It then simultaneously queries multiple price APIs and retailer databases in real time. The floating widget updates progressively as results come in — typically within 2 seconds.

That's PriceLens's real-time scan bar. It slides in at the top of every Amazon product page to let you know scanning is underway. When it finds a better price, it displays the saving amount and the store — right there at the top of the page without you having to look at the widget.

Price history is powered by Keepa, the most comprehensive Amazon price tracking database available. It tracks prices for millions of products across all major Amazon marketplaces and updates multiple times per day. It's the same data professional buyers use.

eBay listings vary significantly — some products are sold as auctions, bundles, or by individual sellers with prices that change constantly. When PriceLens can't find a definitive price match, it shows "Ver preço" and links you directly to the eBay search results so you can browse the options yourself.

No. PriceLens only activates on Amazon product pages. It does not track which sites you visit, what you search for, what you add to your cart, or what you purchase. The extension reads product data only from the page you are currently viewing, to perform the comparison.

Absolutely not. We do not collect personal data and we do not sell data of any kind. Read our full Privacy Policy for details.

PriceLens needs to read the product title, price, and ASIN from the Amazon page you're viewing — this is how it knows what product to search for. It does not read any personal information, account details, payment information, or order history.