Privacy Policy.

The numbers you type into a calculator never leave your browser. Every calculation runs on your own device, and results are not sent anywhere. I do use standard, privacy-respecting analytics to see which calculators get used and whether the site is working, which may record your approximate location (from IP address), device type, and the pages you visit. It sets no cookies. There is no account to create, and I collect no names, emails or other personal details unless you send them to me directly, such as by emailing Contact.

SwiftSums uses your browser's local storage to remember small preferences: your saved calculators, and whether you want US and imperial units or Australian and metric ones. That stays entirely on your device and I never see it. You can view all of it, and clear it, in the panel further down this page. Advertising partners, meaning Google and its partners, may also use cookies and similar technologies for analytics and to serve and measure ads. Google's use of advertising cookies enables it and its partners to serve ads based on your visits to this and other sites; you can opt out of personalized advertising by visiting Google Ads Settings.

This site displays advertising served by third-party vendors, including Google. These vendors may use cookies to serve ads based on a visitor's prior visits to this site or other websites on the internet. Visitors may opt out of personalized advertising by visiting Google's Ads Settings, or by visiting www.aboutads.info to opt out of participating vendors' use of cookies for personalized advertising.

This is read live from your own browser, right now. Nothing below has ever been sent anywhere. I cannot see any of it, which is also why this panel has to run on your own device rather than on a server.

You can also clear all of it through your browser's own settings, under site data for swiftsums.com. Most browsers let you block or delete cookies globally too, though that may affect how ads behave.

I may update this policy as the site changes. Material changes will update the date at the top of this page.

Questions about this policy can be sent via Contact.