Privacy Policy
Last updated: September 2026
Calczy ("we", "us", or "our") operates calczy.com — a free online tools and calculators website. This Privacy Policy explains how we collect, use, and protect your information when you use our site.
1. Data We Collect
Tools data: All calculations and tool inputs happen entirely in your browser. We do not transmit, store, or process your tool inputs on any server. Your data never leaves your device.
Usage data: We collect anonymous analytics data including page views, referrer, browser type, device type, approximate location (country/city), and session duration. This data is aggregated and not linked to your identity.
Cookies: We use cookies and similar technologies for analytics and advertising. See Section 4 below.
2. How We Use Your Data
- To understand which tools are popular and improve our content
- To monitor site performance and fix errors
- To display relevant advertising that supports our free service
- To prevent abuse and protect our site from malicious activity
3. Legal Basis (GDPR)
If you are in the European Economic Area (EEA), our legal basis for processing your data is:
- Consent: For cookies, analytics, and personalized advertising (Article 6(1)(a))
- Legitimate interest: For security and basic site functionality (Article 6(1)(f))
You can withdraw consent at any time by disabling cookies in your browser or using our cookie consent tool.
4. Cookies and Advertising
We use the following cookies:
- Analytics cookies: Google Analytics to track page views and user behavior (anonymized)
- Advertising cookies: Google AdSense and third-party ad partners may use cookies to serve relevant ads based on your prior visits to this and other websites
- Essential cookies: Required for basic site functionality (e.g., remembering your currency preference)
Google AdSense uses cookies to personalize ads. You can opt out of personalized advertising by visiting Google Ad Settings or aboutads.info.
5. Third-Party Services
We use the following third-party services that may collect data:
- Google Analytics: Web analytics (privacy policy)
- Google AdSense: Advertising (privacy policy)
- Netlify: Web hosting and CDN (privacy policy)
6. Your Rights
Depending on your location, you may have the following rights:
- GDPR (EEA/UK): Access, rectify, erase, restrict, port, and object to processing of your data
- CCPA (California): Know, delete, and opt-out of sale of personal information. We do not sell personal information.
- Other jurisdictions: You may have additional rights under your local data protection laws
To exercise these rights, contact us at privacy@calczy.com.
7. Data Retention
Analytics data is retained for up to 14 months. Advertising data retention is governed by our third-party ad partners' policies. We do not maintain user accounts or profiles.
8. Children's Privacy
Our site is not directed to children under 13. We do not knowingly collect personal information from children. If you believe a child has provided us data, contact us and we will delete it.
9. Data Security
We use HTTPS encryption, security headers (HSTS, X-Frame-Options, X-Content-Type-Options), and a reputable CDN. However, no method of transmission over the internet is 100% secure.
10. Changes to This Policy
We may update this Privacy Policy from time to time. We will update the "Last updated" date at the top of this page. We encourage you to review this page periodically.
11. Contact
For privacy questions or requests, contact us at privacy@calczy.com.