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mattercatalog

Privacy Policy

Last Updated: 11/7/2026

This policy explains what information MatterCatalog ("we", "us") collects when you use mattercatalog.com, and why. MatterCatalog is a directory of Matter smart home devices. We do not sell products, take orders or payments, or ask for shipping addresses or phone numbers. When you buy something, you do so on the retailer's own website, under that retailer's privacy policy.

MatterCatalog is published by MatterCatalog, Mill Valley, California.

1. Information you give us

  • Email updates. If you enter your email address in a "Stay updated" form, we store that address, the page you signed up from and the date, so we can send you updates about newly certified Matter devices.
  • Accounts. An account is optional. It is needed only to save devices and to set price alerts. If you create one, your name, email address and password are handled by Google Firebase Authentication. We never see or store your password.
  • Price alerts. If you are signed in with a verified email address and create a price alert, we store the product, your target price and an identifier derived from your account. We check alerts against current prices once a day and show triggered alerts in your account. You can delete an alert at any time from your account.
  • Emails you send us. If you email us, we receive your email address and whatever you include in your message.

2. Information collected automatically

  • Analytics. We use Google Analytics 4 to record which pages are viewed and which retailer links are clicked (the product, the retailer, the page, and the price shown at the time), together with the standard device and browser information Google Analytics collects. Google Analytics uses cookies. You can opt out with Google's opt-out browser add-on.
  • Affiliate links. Many store links are affiliate links (see our Affiliate Disclosure). Apart from the Impact script described below, no affiliate network receives anything from us or your browser until you click one of these links. When you do, your browser goes to the store, sometimes through the network's own redirect address. The store or network receives the usual request information (such as your IP address and browser type) and may set a cookie on its own domain, or add a click identifier to the store's web address, so that a purchase can be credited to us. That happens on their sites and under their privacy policies. When you click a store button that goes through CJ, Rakuten, Awin or Impact, your browser first checks, without cookies, that the network's address can be reached; if your ad blocker stops that check, it sends you straight to the store without our referral. The programs whose links appear on MatterCatalog are:
    • Amazon Associates (links to Amazon.com carry our Associates tag);
    • eBay Partner Network (links to eBay carry our campaign ID);
    • CJ (Commission Junction), Impact, Rakuten Advertising and Awin, which run affiliate programs for brands and stores.
    • brands that run their own affiliate programs (links to their stores carry our referral code in the web address).
    Some store links go through Sovrn Commerce (their web address starts with sovrn.co); Sovrn records the click and sends you on to the store. We also load a publisher script from Impact on our pages. It counts page impressions; it does not change our links.
  • Error reports. When the site hits an error in your browser, a technical report (the error, the page and your browser type) is sent to Sentry, our error-monitoring service. Sentry's option to send personal data is turned off.
  • Hosting and abuse prevention. The site runs on Google Firebase. Like any web server, it receives your IP address and browser details with each request. To stop repeated automated sign-ups, the email-update service keeps a one-way hash of your IP address and browser user agent for rate limiting.
  • AI assistant connector. MatterCatalog runs a read-only connector at mattercatalog.com/api/mcp that AI assistants such as Claude or ChatGPT can use to look up catalog facts. It needs no account and stores nothing about you. For each request it logs the tool used, the name the assistant's software reports for itself, the filters chosen (category, platform, network, and whether only certified or US-sold products were asked for), whether the request failed and how long it took. It never logs what was asked about (product names, brands or questions), only how long that text was. Google Cloud's request log records the time, the requesting address and software name, and the result; for requests made through mattercatalog.com the address is Google's hosting server, not yours. To limit abuse, the connector keeps the requesting address in memory for up to 10 minutes and never writes it to its own log. Both logs are kept for 30 days. Links in the connector's answers carry utm_source and utm_medium tags naming the assistant, so Google Analytics can count visits that came from it.
  • Product images. Some product photos load directly from retailer or manufacturer servers (for example Amazon), which receive the usual request information from your browser, such as your IP address.

3. Information stored only in your browser

Some features keep their data in your browser's local storage, on your device. This includes your comparison list, recently viewed products, the devices you save while signed in, and a record of the retailer links you have clicked. This data is not sent to us. You can remove it at any time by clearing your browser's site data for mattercatalog.com.

4. How we use information

  • To send the email updates you asked for.
  • To run accounts, saved devices and price alerts.
  • To understand which pages and links are useful, so we can improve the catalog.
  • To find and fix errors, and to prevent abuse.

We do not give your email address or account details to advertisers or retailers.

We do not show display ads, and we do not sell your personal information.

5. Services we use

  • Google: Firebase Hosting, Firebase Authentication, Cloud Firestore and Cloud Functions (to run the site, accounts, email updates and price alerts), and Google Analytics.
  • Sentry: error monitoring.
  • Impact: affiliate network (its publisher script on our pages counts page impressions).
  • Amazon Associates, eBay Partner Network, CJ, Rakuten Advertising, Awin and Sovrn Commerce: affiliate networks, only when you follow one of their links.
  • Brands that run their own affiliate programs, only when you follow a link to their store.
  • Stores and manufacturers, when you follow a link to their sites.

6. Your choices

  • You can block or delete cookies in your browser, or use the Google Analytics opt-out add-on.
  • You can use the site without an account and without giving us your email address.
  • To stop email updates or to ask us to delete your email address, account or price alerts, email team@mattercatalog.com.

7. Changes to this policy

When we change how the site handles information, we update this page and the date at the top.

8. Contact us

If you have questions or comments about this Privacy Policy, please contact us at:

MatterCatalog
Email: team@mattercatalog.com