What we do with your data

The short version

You can use almost everything here without an account, and then we hold nothing that identifies you. If you sign up, we hold your email address and the things you chose to keep: saved cars, saved searches, and any vehicle reports you’ve been issued. If you buy a report, Stripe handles your card and we never see it. The browser extension reads a page only when you click it, sends the text to be valued, and keeps none of it unless you save the car.

Accounts

An account is an email address, held by our sign-in provider (Neon Auth) and used to keep your saved cars, saved searches and reports attached to you across devices. If you switch on deal alerts for a saved search, we email you when a matching car appears — that is the only email the account generates, and turning alerts off stops it. Leaving your email on the “tell me when you price this model” form stores that address with the model you asked about, for exactly one email when we can.

The browser extension

When you click the icon on a listing, the extension reads the visible text of that page and sends it to our valuation service, which returns a price. That is the whole exchange.

• ·It has no standing access to any website. It can read a page at the moment you click and not before, and nothing of it runs on a listing until then.
• ·The page text is used to produce the valuation in that response and is not written to a database or used to train anything.
• ·It does not read your browsing history, your tabs, your cookies or anything you are signed into.
• ·The one thing it does without being asked is tell this website that it is installed, so we stop suggesting you install it.
• ·If you save a car, that valuation is kept — see below. Nothing else from the page is.

The website

Describing what you are looking for creates a search we store so the page can be reloaded and shared. It holds what you typed and the shortlist built from it, and is not linked to a person.

Pasting a listing link stores the reading we took from that page for six hours, so the same link pasted twice does not cost a second fetch. A screenshot you send is read and discarded; it is never stored.

Saving a car keeps that valuation — the vehicle, the asking price, what we thought it was worth, and the advert’s address — on a list identified by an unguessable link. Without an account, that link is the only key to it: anyone who has it can read and change the list, and anyone without it cannot find it. Signing in attaches the list to your account so it follows you between devices; the link keeps working either way.

Paying for a report

Card payments go through Stripe. Your card number goes to Stripe and stays there; what we keep is the fact of the purchase — a payment reference, the amount, and which report it bought. Stripe also receives your email address to send a receipt. Refunds work as described in our terms.

Who else sees it

Listing text and screenshots are sent to Anthropic’s API to be read, under their commercial terms, which do not permit training on it. The site runs on Vercel and stores data in Neon; alert and receipt emails are sent through Resend; payments run through Stripe. Nothing is sold, there are no advertising trackers, and page counts come from Vercel’s cookieless analytics.

Registration checks

When you check a registration, that number is sent to the DVSA’s MOT History service, and — for a report — to One Auto API, which draws on the insurance industry’s register (Experian underneath). Both receive the registration and nothing else about you. A free-standing MOT check is not kept. A report is different by design: it stores the registration and everything the checks returned, permanently, on your account — buying it once means reading it forever, and that requires keeping it.

Where an advert’s photographs show the number plate, we may read it from the photos to save you typing it. That plate belongs to the advertised car, not to you, and is stored against the listing.

Vehicle listings

The prices come from public adverts, refreshed nightly. Those are sellers’ public listings rather than anything about you.

Getting in touch

Email support@certmotors.com. If you have an account, you can ask us to show you what we hold or to delete it — that removes your account, saved lists, alerts and reports. Without an account there is no personal record to look up, and removing the extension ends its side of things entirely.