There is no form anywhere on this site. No name, no email, no postcode, no account, no newsletter. We do not ask for your details, so we have nothing to store, share or sell. It is the plainest privacy position there is: we cannot lose what we never collect.
The calculators run entirely in your browser. Anything you type into them stays on your device and is never sent anywhere.
When advertising is shown on the site, the ads are served by Google, and Google and its partners may use cookies to choose and measure the ads you see. That is standard across almost every site that carries advertising. You can review it and turn it down at Google's own Ads Settings (adssettings.google.com) and through your browser's cookie controls. Hearthsum itself neither sees nor keeps any of it.