Privacy policy
Short version: no accounts, no advertising trackers, and your System Builder answers never leave your browser.
Effective October 10, 2026.
What we collect
- System Builder and calculator answers are processed in your browser. They appear in the page address so you can share results; we don't store them on a server.
- Server and security logs. Our host, Cloudflare, processes standard request data (such as IP address and browser type) to deliver and protect the site. See Cloudflare's privacy policy.
- Analytics. We may use Cloudflare Web Analytics, which measures page views without cookies and without tracking you across sites.
- Email. If you email us, we keep your message and address to reply and to log corrections. We don't add you to lists.
Fonts
Our typefaces (Archivo and Atkinson Hyperlegible, both under the SIL Open Font License) are served from our own site, so no third-party font service sees your visit.
Cookies
We don't set advertising or tracking cookies. If we add affiliate links in the future, merchants may set their own cookies when you click through to their sites to attribute purchases; their privacy policies apply on their sites.
Links to other sites
Product buttons take you to merchants' websites. We don't control their data practices.
Children
This site is intended for adults making household purchases. We don't knowingly collect information from children.
Your choices and rights
Because we don't keep accounts or profiles, there's usually nothing to access or delete. If you've emailed us and want your messages deleted, write to [email protected]. Residents of California and other states with privacy laws can make the same request; we don't sell or share personal information.
Changes
We'll update this page and its effective date if anything changes, and note it in Updates.
Last checked . See what changed.