Privacy policy

Last updated 18 October 2026. Plain language, on purpose. If anything here is unclear, ask via the report form.

What we collect

• Account: your email address and a sign-in identity, handled by Clerk, our authentication provider. We never see your password.
• Coin photos you submit for a full grade, the crops the model graded, and the results. Photos from quick screens in the browser extension are processed and discarded; only the result is kept.
• Grades you record for your coins ("your grade": a slab grade or anyone's opinion), shown only to you on your scorecard. We never use them to train or measure the grader.
• Payment details are handled entirely by Stripe. We store your Stripe customer id, what you bought, and your subscription status, never card numbers.
• Usage: which pages and features you use, timings, and errors, so we can keep the service working.

What we do with photos

Your photos are stored privately under your account so you can see your history. They are never shown to other users, and a shared grade link shows only the small graded crops, never your originals or your name.

If you leave the training box ticked when grading, we may use those photos, together with the model's result, to train future versions of the grader. Untick it and the photos are used for nothing but your own history. You can ask us to delete your photos and account at any time.

Browser extension

On eBay and Heritage listing pages, the extension reads the listing's coin images from the page your browser already loaded and sends them to our grader to produce a badge. It sends nothing else from those pages, does not track your browsing, and does not run on other sites.

Cookies

We use only the cookies needed to keep you signed in and to remember settings. No advertising cookies, no third-party trackers.

One more, our own: if you arrive from a link that names where it was posted (for example a video description or a forum post), or from another website, we remember that source, the page you landed on, and the date for up to 90 days. If you sign up, it is saved with your account so we can tell which places are worth our time. It holds nothing else, is never shared, and is not set at all if you come straight to the site.

Who else sees data

Clerk (sign-in), Stripe (payments), Google Cloud (hosting, storage, and photo checks, in the United States), Google's Gemini model on Vertex AI (it reads the photos of a full grade to identify the coin, in the United States; under Google Cloud's terms they are not used to train Google's models), and Modal (the GPU servers that run the grading model, in the United States; photos pass through and are not stored there). Each only receives what it needs for its job. We do not sell or rent personal data.

Your choices

• Turn training use off per grade, or ask us to remove past photos from training.
• Stop sharing any grade link from its page.
• Delete your account and data by asking through the report form; we complete deletions within 30 days.

Contact

Use the report form for any privacy question or request.