Privacy

Privacy policy

Last updated 2026-09-17.

What we collect

This site uses Google Analytics to understand which pages are read and which links are followed. That collects standard web analytics data including pages viewed, approximate location derived from IP address, device and browser type, and referring site. We do not use it to identify individuals.

Calculator inputs never leave your browser. Every calculation on this site runs locally in the page, and nothing you type into a calculator is transmitted anywhere.

Forms

If you send a message through the contact or partner form, it is delivered by FormSubmit to our email address and we keep it only as long as needed to reply. If you give an email address on a build list form, it is collected through Google Forms so we can send the list you asked for. You can ask us to delete either at any time.

Affiliate links

Product links on this site are Amazon affiliate links. Following one sends you to Amazon, which sets its own cookies and applies its own privacy policy. We receive aggregate reporting from Amazon about clicks and orders, never personal information about you.

Cookies

Google Analytics sets cookies. Amazon sets cookies when you follow a product link. This site sets no cookies of its own.

Your choices

You can block analytics with a browser extension or a privacy mode and the site will work normally. To ask about data we hold, contact us.