CartMatrix Privacy Policy

Effective: 2 November 2026 · Applies to the CartMatrix: Product & Pricing Matrix Extractor Chrome extension, version 1.0.0 and later

CartMatrix turns the product listings on the store page you are viewing into a sortable pricing table. It works entirely inside your browser. CartMatrix has no account system and no server, and it sends nothing to its developer. It has no analytics, tracking, advertising or remotely loaded code.

In short

• CartMatrix reads product information (names, prices, variants, stock) from the web pages you open and builds the table on your own computer.
• Scan results stay in that browser tab's memory and are discarded when you close the tab or leave the page.
• CartMatrix stores only your settings and license status, in Chrome's extension storage.
• CartMatrix makes only two kinds of network request on its own, and only when you start them:
  1. Full-catalog scan (Pro): a request to the store you are viewing, for that store's public product feed.
  2. License activation: a request to Gumroad to check a purchased license key.
• No data is sold, shared for advertising, or seen by the developer.

1. Information CartMatrix reads from web pages

CartMatrix's content script runs on the pages you visit, so it can tell when a page lists products. On each page it looks for product information in:

• the page's HTML
• structured data (JSON-LD, microdata, Open Graph)
• data that Shopify and WooCommerce pages publish

It reads:

• product names, links and image addresses
• prices, compare-at (original) prices, currency and discounts
• variants, SKUs, stock status, vendor/brand and product type
• the address of the current page and its host name, to label the results and link each row to its product

All of this is processed locally in your browser. The results are held in memory for that tab only, to show the toolbar badge count, the popup summary and the in-page matrix. The results are never saved to storage and never transmitted to the developer or anyone else.

CartMatrix does not read what you type into forms, passwords, payment details or your browsing history. It does not keep a record of the sites you visit.

2. Information stored on your device

About chrome.storage.sync: CartMatrix keeps a copy of your license status there so Pro follows your Chrome profile to your other computers. If Chrome Sync is turned on, Google syncs this data across the browsers signed in to your Google Account, under Google's Privacy Policy. The developer has no access to it. If Chrome Sync is off, the copy stays on your device. To clear the synced copy, use Remove license from this browser before uninstalling.

Exports:

• CSV and JSON files are created in your browser and saved to your downloads folder like any other download.
• The Sheets button writes the table to your clipboard so you can paste it into a spreadsheet. CartMatrix never reads your clipboard.

3. Network requests

CartMatrix makes no network requests to its developer. These are the only requests it makes:

Full-catalog scan (Pro, only when you click "Start scan")

CartMatrix requests the store's public product feed from the same website you are viewing, one page at a time:

• /products.json for the whole store
• /collections/<name>/products.json for one collection

Your browser sends these requests like any other request to that website, including that site's own cookies. The responses are processed in memory in your browser and are not stored or forwarded.

License activation (only when you enter a purchased key and click "Activate")

CartMatrix sends an HTTPS request to Gumroad's license API (https://api.gumroad.com/v2/licenses/verify) containing:

• your license key
• the CartMatrix Pro product ID
• an instruction to count this activation (each key works on up to 3 devices)

Gumroad replies with whether the key is valid, whether the purchase was refunded or disputed, and how many times the key has been activated.

Like any website, Gumroad also receives standard request information: your IP address and browser type. If you activate from the in-page panel, it also receives the address (origin) of the site that panel is open on. Gumroad handles this under its own privacy policy. The license check runs only at activation, never in the background.

The Chrome Web Store reviewer key is checked offline: the extension contains only its SHA-256 hash, so checking it sends no network request.

Product images

The matrix shows product thumbnails using the image addresses the store publishes. Your browser loads them from the store's servers or its image service, just as it does when you browse the store.

Links you choose to open

These buttons open a website in a new tab only when you click them:

• Get Lifetime Pro opens the CartMatrix Pro page on Gumroad.
• Donate / Tip the Developer opens Buy Me a Coffee.

Those websites have their own privacy policies.

4. Purchases

CartMatrix Pro is bought on Gumroad's website, not inside the extension. Gumroad processes your payment. As the seller, the developer receives the order details Gumroad provides to sellers, such as the email address you used at checkout. Those details are used only to deliver your license key, provide support and handle refunds. They are not linked to anything the extension does on your computer.

5. What CartMatrix never does

• It does not sell or rent user data.
• It does not use or transfer data for advertising, including personalized, re-targeted or interest-based ads.
• It does not track you across websites or build profiles.
• It does not use data for creditworthiness or lending purposes.
• It does not allow anyone to read your data. The developer never receives it.

6. Chrome Web Store Limited Use

CartMatrix's use of information received from web pages and Chrome APIs adheres to the Chrome Web Store User Data Policy, including the Limited Use requirements. Data is used only to provide CartMatrix's single purpose: showing and exporting the products and prices on the store page you are viewing.

7. Security

• License checks with Gumroad use HTTPS.
• Everything else stays in Chrome's extension storage and the memory of your browser tab, which only CartMatrix can access.

8. Children

CartMatrix is a general-purpose shopping and research tool. It is not directed at children under 13 and does not knowingly collect personal information from anyone.

9. Your choices

• Turn off the floating button: Pro / Settings tab in the toolbar popup.
• Remove your license: Pro / Settings → Remove license from this browser. This clears the local and synced copies.
• Remove everything: uninstall CartMatrix from chrome://extensions. This deletes its local storage.
• Purchase data held by Gumroad: contact Gumroad, or the developer at nijkanani.dev@gmail.com.

10. Changes to this policy

If CartMatrix's data practices change, this policy will be updated before the new version is released and the effective date above will change. Any new kind of data handling will also be described in the release notes and, where required, will ask for your consent in the extension.

11. Contact

Questions about this policy or your data: nijkanani.dev@gmail.com