Privacy Policy

1. Information We Collect

a) Calculator inputs

The inputs you enter into our sleep calculators (sleep duration, bedtime, caffeine intake, etc.) are processed in your browser. We do not transmit your individual sleep data to our servers, store it in a database, or share it with third parties. Your data stays on your device unless you explicitly contact us.

b) Information you submit

When you contact us via email or our contact page, we receive your name, email address, and the contents of your message. We use this information solely to respond to your inquiry.

c) Automatically collected information

Like most websites, we collect standard log information (IP address, browser type, referring URL, pages visited, timestamps) for analytics and security purposes.

2. Cookies and Similar Technologies

We use cookies and similar technologies to remember your theme preference, run anonymized analytics, and serve advertisements. You can control cookies through your browser settings. Note that disabling cookies may affect site functionality.

The categories of cookies we use:

• Essential cookies — required for basic site functionality (e.g., remembering dark/light theme).
• Analytics cookies — help us understand which pages and tools are popular.
• Advertising cookies — used by Google AdSense and other advertising partners to serve personalized ads.

3. Google AdSense

This site uses Google AdSense, a third-party advertising service provided by Google LLC. Google may use cookies (including the DoubleClick DART cookie) to serve ads based on your prior visits to this and other websites. You may opt out of personalized advertising by visiting Google Ads Settings or aboutads.info.

Third-party vendors, including Google, use cookies to serve ads based on a user's prior visits to this website and other websites on the Internet. For more information, please review Google's Advertising & Privacy policy.

4. Analytics

We may use privacy-respecting analytics services (such as Plausible, Fathom, or Google Analytics with anonymized IP) to measure aggregate site usage. These services do not personally identify you.

5. How We Use Information

• To operate and improve our calculators and content.
• To respond to your inquiries and feedback.
• To monitor site security and prevent abuse.
• To serve and measure advertisements where applicable.
• To comply with legal obligations.

6. Data Sharing

We do not sell, rent, or trade your personal information. We may share information only with: (a) service providers who help operate the site under strict confidentiality, (b) advertising partners as described above, and (c) law enforcement when legally required.

7. Your Rights (GDPR / CCPA / Other)

Depending on where you live, you may have the right to access, correct, delete, or restrict the use of your personal information. EU/EEA/UK users have GDPR rights; California residents have CCPA rights. To exercise any rights, please contact us and we will respond within applicable legal timeframes.

8. Children's Privacy

Our site is not directed to children under 13 (or 16 in the EU/EEA). We do not knowingly collect personal information from children. If you believe a child has provided us with personal information, please contact us so we can delete it.

9. Data Security

We implement reasonable technical and organizational measures to protect information transmitted to us. However, no Internet transmission is 100% secure, and we cannot guarantee absolute security.

10. International Transfers

Our servers and service providers may be located in various countries. By using SleepDebtCalc, you consent to the transfer of your information to those jurisdictions, which may have data protection laws different from yours.

11. Changes to This Policy

We may update this Privacy Policy from time to time. The "Last updated" date at the top reflects the most recent changes. Material changes will be highlighted on our homepage or notified via this page.

12. Contact

For privacy questions, please email privacy@sleepdebtcalc.com or use our contact form. See also our Terms & Conditions and Disclaimer.