Privacy

Project Mirador (the Chrome extension) and this web page. Last updated October 29, 2026.

The short version

The only thing we receive is the text you choose to check or look up. There are no accounts, ads, trackers or analytics, and nothing is sold. The extension cannot read the pages you visit.

What is sent, and when

When you highlight text and choose Check with Project Mirador, type a claim in the side panel, or use this page, that text is sent to our server (stelthar-api.vercel.app) to be checked. Nothing else on the page is sent.
Our server asks the agencies' public data services (the Bureau of Labor Statistics, the Bureau of Economic Analysis, the Census Bureau, the Treasury and the Federal Reserve Bank of St. Louis) for the figures the claim is about.
The claim's text is also sent to Google's Fact Check Tools search, to find other outlets' published fact-checks of similar claims.
When the built-in rules can't read a claim, or a search you submit, its text may be sent to an AI provider (Anthropic) to find the figure in government datasets or, for claims, in published sources. This is capped at a small number of requests per day.

What is kept

On your device: the extension keeps your last few checks so they show under Recent. They stay in your browser and are never sent anywhere. Clear in the side panel deletes them.
On our server: answers are stored by the claim's wording for up to a week, so the same claim is answered at once next time. If a check fails, the first 120 characters of the claim may appear in our error logs.
Usage limits: to stop abuse, we count checks per visitor using a one-way hash of the IP address, never the address itself. The counts expire within two days.

What is not collected

No names, email addresses, browsing history, page contents, cookies or location. Nothing is used for advertising, sold, or shared beyond the services named above.

Independent

Project Mirador is an independent project. It is not a government service, and is not affiliated with or endorsed by any of the agencies or fact-checkers whose data it shows.

Questions

Open an issue at github.com/RadoKyselak/Stelthar-API.