Privacy
What we collect
Close to nothing, and none of it is about you personally. Last updated 1 August 2026, when the browser extension was added below.
The calculator
Every number you type runs through JavaScript in your own browser. Sold prices, costs, categories and the profit figure are never sent anywhere. There is no account, no login and no form. Close the tab and it's gone.
Cookies
None. The site sets no cookies, so there is no consent banner to click through.
Traffic counting
Added 27 July 2026, and noted here as promised. The site counts page views with GoatCounter, an open-source counter chosen because it works without cookies. For each page view it records the page, the referring site, browser and system type, screen size, and country. It keeps no profile of you, sets no cookies, follows you to no other site, and none of it is sold or used for advertising. We use it to answer one question: are people finding the calculator.
Third parties
The counter script above loads from GoatCounter's servers; that is the only third-party request on the page. Fonts are still served from this domain rather than from Google.
The site is hosted on Netlify, which keeps standard server logs including IP addresses, as any web host does. Their privacy terms cover that.
If you email us
Mailing hello@listmargin.com means we have your email address and whatever you wrote. We use it to reply and nothing else. It doesn't get sold, shared, or added to a mailing list.
The embedded version
If you're using the calculator inside someone else's page, the same applies: your inputs stay in your browser. The widget reports only its own height to the page around it, so the frame can be sized correctly. That message contains a number and nothing else. The widget also counts that it was loaded, using the same cookieless counter described above.
The browser extension
Listmargin for eBay Sellers is a Chrome extension that shows fees and an estimated payout on the eBay listing you're looking at. It collects nothing. There is no account, no identifier, and no analytics inside it — not the cookieless counter described above, not anything else.
It reads the open listing page — the price, the shipping, the category — in your browser, and does the arithmetic there. None of that is transmitted anywhere. We never see which listings you look at, and there is nothing on our side that could record it.
Every network request the extension makes goes to this site, and there are four of them: the fee schedule and the category table for eBay.com, and the same pair for eBay.ca. It downloads them at most once every six hours and keeps them in your browser, so the rates stay right when eBay changes one without us having to push an update. Those requests carry no listing data and no identifier — they ask for a file, the same as loading a page here. Like any request to this site they reach Netlify, whose standard server logs are covered above.
Your store tier, the one setting the panel has, is stored locally in your own browser so you don't have to pick it again on the next listing. It stays on your machine. Uninstalling the extension removes it.
Changes
If this ever stops being accurate, for example because analytics gets added, the change will be described here with a new date rather than quietly folded in.