Last updated: 1 October 2026

Card Tracker is a browser extension that runs only on pages of colonist.io. It reads the game log shown on the page to calculate which resource cards the players are likely to hold, and displays the result in a panel on the same page.

Game data. The game log and everything calculated from it stay in your browser. They are never sent anywhere and are discarded when you close or reload the page.

Stored in the browser. The extension stores your design choice (light or dark), whether your free game has been used and whether you have unlocked the extension in the browser's local extension storage. The ExtensionPay key and the last unlock status reported by ExtensionPay (including the email address of a purchase) are kept in the browser's extension storage as well; if browser sync is turned on, the browser may sync that part between your devices.

Payments (ExtensionPay). Your first game is free; after that, the extension can be unlocked with a purchase. Payments are handled by ExtensionPay (extensionpay.com) and Stripe. To check whether you have unlocked the extension, it requests a random key from ExtensionPay, stores it, and uses it to ask ExtensionPay for your unlock status. When you buy or log in, you enter your email address and payment details on the ExtensionPay and Stripe pages, not in the extension; ExtensionPay then returns your unlock status and the email address of the purchase to the extension. The privacy policies of ExtensionPay and Stripe apply to that processing (ExtensionPay describes its handling of data in the FAQ on its website).

Nothing else. No advertising, no analytics, no tracking, no other third-party services. The extension requests access to colonist.io (to read the game log and show the panel), the "storage" permission (for the values above) and, in Firefox, access to extensionpay.com (for the unlock status).

If this policy changes, the new version will be published here with a new date.