Privacy Policy
Last updated: October 2025.
This Privacy Policy describes how Calcustack ("we", "us") collects, uses and shares information when you visit our website.
What we collect
- Calculator inputs: processed entirely in your browser. We do not transmit or store them.
- Email addresses: collected only when you opt in to our PDF or newsletter forms.
- Analytics: aggregated, anonymous usage data via Google Analytics 4 (pageviews, session duration, country, device type).
- Server logs: standard request logs containing IP, user agent and referrer for security and operations.
Cookies
We use first-party cookies for site preferences and third-party cookies set by our analytics partner. You can clear or block cookies in your browser settings; some features may degrade if you do.
Third-party services
We rely on the following categories of third parties: hosting providers, content delivery networks, analytics platforms (Google Analytics), and email service providers. Each is bound by its own privacy policy.
Your rights
Depending on your jurisdiction (GDPR in the EU/UK, CCPA in California), you may have the right to access, correct, delete or export the personal data we hold about you. Email privacy@calcustack.com to exercise these rights.
Children
Calcustack is not directed to children under 13. We do not knowingly collect personal information from children.
Changes
We may update this policy from time to time. Material changes will be highlighted at the top of this page.