Privacy
Short version: nothing you type is sent anywhere.
Your products and settings
The calculator runs entirely in your browser. Prices, costs and product names are never sent to this site or to anyone else. When you save a product, it is stored in your browser's own storage on this device (local storage, not a cookie). Clearing your browsing data removes it, and some browsers, Safari in particular, clear a site's storage after a week or so without a visit. For anything you want to keep, use Back up to download a file of your saved products, and Restore to load it again, on this device or another.
Share links
Copy link puts the current product's figures into the link itself, after the # sign. That part of a link is never sent to the server, so the figures only travel to whoever you send the link to. Don't share one if the figures are confidential.
Light or dark
If you choose light or dark mode, that one word is kept in the same browser storage so the site remembers it.
Visitor counting
We count visits with Cloudflare Web Analytics, which uses no cookies and stores nothing on your device. It records which pages are viewed and roughly where in the world from, not who you are.
Contact
Questions about any of this: hello@margincheck.co.uk.