Cardmarket Tools collects no personal data and sends nothing about you anywhere.

It runs only on Cardmarket's Offers, Bulk Listing and Wants pages. It downloads public price files from manavalue.org, with no cookies or identifiers attached. It sends requests to Cardmarket only when you use a tool that acts on your account (adding to cart, repricing, bulk listing), exactly as Cardmarket's own buttons would. Settings and the cached price data are stored in your browser and never leave it. A CSV you load for Bulk Listing is read locally and is never uploaded.