Privacy

What we keep

Your email address, so we can send you a sign-in link and tell you when a price drops. And for each purchase we are watching:

• the item number
• the price you paid, and the regular price if the receipt showed one
• any money already taken off at the register
• how many you bought, and the date
• the warehouse number, country and state or province

That is the whole list.

One thing sits on your account: the state or province of your most recent purchase. It is how we know which sales are relevant to you.

What we never receive

• your receipts
• the name or description of anything you bought
• your membership number
• how you paid: no card number, no last four digits
• your Costco password, or the sign-in code your browser holds for Costco

This is not a promise about how carefully we handle those things. We do not have them. The Chrome extension reads your receipts on your own computer, keeps the handful of numbers above, and throws the rest away before anything is sent.

What never leaves your computer at all

Some purchases are dropped before the list is even made: nothing from the pharmacy counter, the liquor or tobacco aisles, or the fuel pump. Not the item number, not the price, not the date.

Costco does not adjust the price on any of them, so we would have nothing to tell you about them anyway.

The Chrome extension

It runs on two web addresses only, costco.com and costco.ca, plus the address Costco's own pages use to fetch your receipts, and our own address. It cannot see any other website you visit. It reads your receipts using the sign-in you already have with Costco; that sign-in never leaves your computer.

The extension contains no downloaded code. Everything it runs is in the package you installed, and it never fetches a program from anywhere to run it.

Until you ask for emails, nothing is sent to us at all. The list sits on your own computer.

What we do with it

One thing: we compare the items you bought against the sale prices Costco is currently advertising, and email you when one of them is worth money back. We do not sell anything to anybody, we do not share your information with advertisers, and there are no trackers on this website.

How long we keep it

Costco's price adjustment window is 30 days. The day after a purchase's window closes, that purchase is deleted: the item number, the price, the date, the warehouse, all of it. Nothing waits for you to ask.

We keep a record of any claim we found you, because it is the only way we can tell whether this product works. And we keep the state or province of your most recent purchase, so we can tell you when a new sale starts where you shop. That is a region, not an address, and it is never shown on the site.

Your email address stays until you delete your account.

Deleting everything

There is a Delete everything button on your account page. It removes your email address and every purchase, straight away, and signs you out everywhere. There is no undo, and nothing is kept in a backup copy for us to restore.

You can also stop the emails without deleting anything. Every email we send has a one-click link at the bottom, and it works without signing in.

Who to ask

Email feedback-pricematch@engsight.app with any question about this page, including a request to see or delete what we hold.