The Supermarket Tracker is a Chrome add-on developed by Sergi Ávila. It is a free tool that provides users with the historical prices of products from Spanish supermarkets. Currently, the add-on only works with Mercadona, but the developer plans to expand its compatibility to include Consum and Carrefour in the near future.

With the Supermarket Tracker, users can easily track and compare the prices of their favorite products over time. This can be particularly useful for budget-conscious shoppers who want to make informed purchasing decisions. By analyzing the historical price data, users can identify trends, spot discounts, and determine the best time to buy certain products.

The add-on is simple to install and use, seamlessly integrating into the Chrome browser. It provides an intuitive interface that allows users to search for specific products and view their price history. The Supermarket Tracker is a valuable tool for anyone looking to save money on their supermarket purchases.