Privacy policy

Last updated: October 16, 2026

Calculators. All calculations happen in your browser. We don't receive or store the numbers you enter.

Analytics. We may use privacy-friendly analytics (such as Cloudflare Web Analytics) that count page views without cookies or personal profiles.

Advertising. If we show ads from Google AdSense, Google and its partners may use cookies to serve ads based on your visits to this and other websites. You can opt out of personalized advertising at Google Ads Settings.

Purchases and newsletter. Payments and email subscriptions are handled by third-party providers (for example Gumroad, Stripe or Beehiiv) under their own privacy policies. We receive your name and email so we can deliver what you bought or subscribed to.

Contact form. Messages sent through our contact form are processed by Formspree and delivered to us by email. We use them only to reply to you.

Affiliate links. When you click an affiliate link, the destination site may set a cookie to record the referral.

Your rights. To ask about, correct or delete data we hold about you, use our contact form.