ShrinkWatch EU

See the real price per kg or litre on supermarket web shops, and get a warning when a pack shrinks but the price stays the same.

Download the latest release Source on GitHub

ShrinkWatch EU badge on a fictional product page: unit price, then a shrinkflation warning

What it does

Unit price on every product
Shows €/kg, €/l or price per piece, even when the shop doesn't. Works with euros and with CZK, HUF, PLN, RON, SEK, DKK, RSD and BAM.
Shrinkflation warning
Remembers pack sizes you've seen, so if 500 g becomes 450 g for the same price, you see "+11.1% per kg".
Price history
The popup shows how the unit price of the product you're viewing has changed.
Private by design
No account, no server, no tracking. Everything stays in your browser.

Supported shops

About 70 grocery web shops in Germany, Austria, France, Italy, Spain, Portugal, the Netherlands, Belgium, the Nordics, Poland, Czechia, Hungary, Romania, Greece, the Baltics, Croatia, Slovenia, Serbia and Bosnia and Herzegovina, including Lidl, Kaufland, Rewe, Billa, Carrefour, Auchan, Konzum, Mercator and Maxi. See the full list. A few shops are on by default. Others ask for access only when you switch them on.

By country

Install

  1. Download shrinkwatch-chrome-*.zip or shrinkwatch-firefox-*.zip from the latest release.
  2. Chrome / Edge / Brave: unzip it, open chrome://extensions (or edge://extensions), turn on Developer mode and click "Load unpacked".
  3. Firefox: open about:debugging#/runtime/this-firefox, click "Load Temporary Add-on" and pick the zip.

Store listings for Chrome and Firefox are coming.

Missing a shop?

Request it on GitHub, or report a wrong result.