WEM Price Compare by Tony Xhufi

See what a product costs elsewhere before you buy. One click compares any product page worldwide, and a panel appears automatically on 40+ shops. Where a page publishes a barcode, it matches that exact item. Free, and never changes the price you pay.

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About this extension

See what a product costs elsewhere before you buy it. WEM Price Compare is a free price comparison tool that checks the same or a similar item at 10+ other major retailers and shows you the best price it finds, right where you are shopping.

WORKS ON ANY SHOP — WORLDWIDE
• One click, anywhere: on any product page, click the WEM icon and press "Compare this page's product". The extension reads the product details the page already publishes and looks for a better price. It only ever runs on that click — never in the background, never on its own.
• Automatic on supported shops: open a product page at a supported retailer and the panel appears on its own with the best price found elsewhere. If you're already on the best deal, it says that too. The current list of supported shops is at wem3.ai/extension.

WHAT ELSE IT DOES
• Shops in your currency: .co.uk pages compare in pounds, .com pages compare in dollars. Savings are always like-for-like — never a £ price pretending to beat a $ price.
• Matches by barcode, not guesswork: where a shop publishes the product's barcode (EAN/UPC), WEM looks up that exact item — so a 200ml spray is never compared against the 75ml bottle of the same range.
• Match confidence + honest filters: we show why weak matches were hidden (accessories, brand/marketplace policy, title mismatch).
• Shipping caution on cross-border listings, so a headline "cheaper" price is not trusted before checking delivery time and import costs.
• 90-day price history on products WEM tracks, so you can tell a real discount from a "was" price that was never charged.
• Watch this price: opens wem3.ai in a new tab where you can set an email alert for a drop. The extension itself never asks for your email.
• Compact mode: prefer quiet? Turn off auto-expand and the panel collapses to a small pill showing just your potential saving.

A TRANSPARENT ALTERNATIVE TO COUPON AND CASHBACK EXTENSIONS
• Free forever — no account, no sign-up.
• Privacy-friendly — no personal data, no browsing-history collection, no fingerprinting. The product's title, price and barcode are sent to wem3.ai only to fetch comparison results, and anonymous usage stats (a random install ID, never your identity) help us improve.
• Honest by design — it never rewrites the links on a page, never injects coupon codes, and never overrides another publisher's inbound affiliate tag. Compare here first, then stack your usual coupon extension at checkout if you want codes.
• Creator-safe — we only earn when you choose a different retailer through our panel.

WEM may earn a commission when you buy through a link it shows you. It never changes the price you pay, and it never touches the affiliate credit of the site you were already on.

Privacy policy: https://wem3.ai/privacy
Affiliate disclosure: https://wem3.ai/disclosure
Support: info@wem3.ai

Developer comments

WEM may earn a commission when you buy through a link shown in the panel. It never changes the price you pay, never rewrites links on the page you are already viewing, and never overrides another publisher's affiliate credit. Full disclosure: https://wem3.ai/disclosure

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Permissions and data

Required permissions:

Access your data for www.amazon.co.uk
Access your data for www.amazon.com
Access your data for www.ebay.co.uk
Access your data for www.ebay.com
Access your data for www.currys.co.uk
Access your data for www.argos.co.uk
Access your data for www.johnlewis.com
Access your data for ao.com
Access your data for www.ao.com
Access your data for www.very.co.uk
Access your data for www.boots.com
Access your data for www.asos.com
Access your data for www.apple.com
Access your data for www.superdrug.com
Access your data for www.lookfantastic.com
Access your data for www.cultbeauty.co.uk
Access your data for www.beautybay.com
Access your data for www.spacenk.com
Access your data for www.thebodyshop.com
Access your data for www.myprotein.com
Access your data for www.lego.com
Access your data for www.dunelm.com
Access your data for www.diy.com
Access your data for www.wickes.co.uk
Access your data for www.robertdyas.co.uk
Access your data for www.wayfair.co.uk
Access your data for www.pandora.net
Access your data for www.marksandspencer.com
Access your data for www.sainsburys.co.uk
Access your data for www.debenhams.com
Access your data for www.superdry.com
Access your data for www.monsoon.co.uk
Access your data for www.qvcuk.com
Access your data for www.decathlon.co.uk
Access your data for www.sweatybetty.com
Access your data for www.prettylittlething.com
Access your data for www.boohoo.com
Access your data for www.clarks.co.uk
Access your data for www.schuh.co.uk
Access your data for www.jdsports.co.uk
Access your data for www.riverisland.com
Access your data for www.boden.co.uk
Access your data for www.laredoute.co.uk
Access your data for www.mango.com
Access your data for www.simplybe.co.uk
Access your data for superdrug.com
Access your data for lookfantastic.com
Access your data for cultbeauty.co.uk
Access your data for beautybay.com
Access your data for spacenk.com
Access your data for thebodyshop.com
Access your data for myprotein.com
Access your data for lego.com
Access your data for dunelm.com
Access your data for diy.com
Access your data for wickes.co.uk
Access your data for robertdyas.co.uk
Access your data for wayfair.co.uk
Access your data for pandora.net
Access your data for marksandspencer.com
Access your data for sainsburys.co.uk
Access your data for debenhams.com
Access your data for superdry.com
Access your data for monsoon.co.uk
Access your data for qvcuk.com
Access your data for decathlon.co.uk
Access your data for sweatybetty.com
Access your data for prettylittlething.com
Access your data for boohoo.com
Access your data for clarks.co.uk
Access your data for schuh.co.uk
Access your data for jdsports.co.uk
Access your data for riverisland.com
Access your data for boden.co.uk
Access your data for laredoute.co.uk
Access your data for mango.com
Access your data for simplybe.co.uk

Optional permissions:

Access your data for www.amazon.co.uk
Access your data for www.amazon.com
Access your data for www.ebay.co.uk
Access your data for www.ebay.com
Access your data for www.currys.co.uk
Access your data for www.argos.co.uk
Access your data for www.johnlewis.com
Access your data for ao.com
Access your data for www.ao.com
Access your data for www.very.co.uk
Access your data for www.boots.com
Access your data for www.asos.com
Access your data for www.apple.com
Access your data for www.superdrug.com
Access your data for www.lookfantastic.com
Access your data for www.cultbeauty.co.uk
Access your data for www.beautybay.com
Access your data for www.spacenk.com
Access your data for www.thebodyshop.com
Access your data for www.myprotein.com
Access your data for www.lego.com
Access your data for www.dunelm.com
Access your data for www.diy.com
Access your data for www.wickes.co.uk
Access your data for www.robertdyas.co.uk
Access your data for www.wayfair.co.uk
Access your data for www.pandora.net
Access your data for www.marksandspencer.com
Access your data for www.sainsburys.co.uk
Access your data for www.debenhams.com
Access your data for www.superdry.com
Access your data for www.monsoon.co.uk
Access your data for www.qvcuk.com
Access your data for www.decathlon.co.uk
Access your data for www.sweatybetty.com
Access your data for www.prettylittlething.com
Access your data for www.boohoo.com
Access your data for www.clarks.co.uk
Access your data for www.schuh.co.uk
Access your data for www.jdsports.co.uk
Access your data for www.riverisland.com
Access your data for www.boden.co.uk
Access your data for www.laredoute.co.uk
Access your data for www.mango.com
Access your data for www.simplybe.co.uk
Access your data for superdrug.com
Access your data for lookfantastic.com
Access your data for cultbeauty.co.uk
Access your data for beautybay.com
Access your data for spacenk.com
Access your data for thebodyshop.com
Access your data for myprotein.com
Access your data for lego.com
Access your data for dunelm.com
Access your data for diy.com
Access your data for wickes.co.uk
Access your data for robertdyas.co.uk
Access your data for wayfair.co.uk
Access your data for pandora.net
Access your data for marksandspencer.com
Access your data for sainsburys.co.uk
Access your data for debenhams.com
Access your data for superdry.com
Access your data for monsoon.co.uk
Access your data for qvcuk.com
Access your data for decathlon.co.uk
Access your data for sweatybetty.com
Access your data for prettylittlething.com
Access your data for boohoo.com
Access your data for clarks.co.uk
Access your data for schuh.co.uk
Access your data for jdsports.co.uk
Access your data for riverisland.com
Access your data for boden.co.uk
Access your data for laredoute.co.uk
Access your data for mango.com
Access your data for simplybe.co.uk
Access your data for wem3.ai

Required data collection, according to the developer:

Website content

Optional data collection, according to the developer:

Technical and interaction data