Introduction
Your privacy is important to us. This Privacy Policy explains how we collect, use, and protect information when you use the Intermittent Fasting Window Calculator (the "Service").
TL;DR: We do not collect, store, or share your personal data. Your wake times, sleep times, and protocol choices are processed only in your browser and never sent to our servers.
1. Information We Collect
1.1 Calculation Data
When you use the calculator, you enter:
- Your wake time
- Your sleep time
- Your preferred fasting protocol
We do NOT collect, store, or transmit this data. All calculations happen on your device using your browser's JavaScript engine. This data never leaves your device.
1.2 Automatically Collected Information
Like most websites, we may automatically receive limited information about your device and usage:
- IP address: Standard web server logs (not personally identifiable without additional context)
- Browser type and version (for technical support and compatibility)
- Device type (mobile, desktop, tablet)
- Approximate geolocation: Based on IP address (country/region level only)
- Page visit timestamps: When you access the site
This information is collected by standard web server logging and Google Analytics (if enabled) to help us understand site performance and user demographics—NOT to identify you personally.
2. Cookies & Local Storage
2.1 Our Use
This site does NOT use cookies or local storage to track you or store your personal data. We do not create user profiles or persistent identifiers.
2.2 Third-Party Cookies
If we deploy Google AdSense or other ad networks in the future, those networks may use cookies according to their own privacy policies. We recommend reviewing their policies directly:
- Google AdSense: https://policies.google.com/privacy
- Google Analytics: https://policies.google.com/privacy
3. How We Use Information
The limited automatically-collected information is used only for:
- Site performance monitoring: Identifying and fixing technical issues
- Security: Detecting and preventing abuse (DDoS attacks, scraping)
- Aggregated analytics: Understanding traffic patterns and popular features (non-personally-identifiable)
We do NOT:
- Sell or share personal data
- Create user profiles
- Use data for marketing or targeted advertising
- Share data with third parties (except as required by law)
4. Data Security
Because we do not collect personal data, the security risk is minimal. However, we protect our systems using:
- HTTPS encryption for all connections
- Rate limiting to prevent automated abuse
- Regular security audits and updates
- Web Application Firewall (WAF) protection
5. Your Rights
Depending on your location, you may have the following rights:
- Right to access: Request what data we hold about you (minimal to none)
- Right to deletion: Request deletion of any stored data (covered by data retention policy below)
- Right to opt-out: Disable analytics cookies or use a do-not-track browser setting
To exercise any of these rights, contact us at the address below.
6. Data Retention
Because we do not collect personal calculation data:
- Server logs: Retained for 30 days (for security and troubleshooting)
- Aggregated analytics: Retained indefinitely in anonymized form
- User input data: Never retained (processed and discarded)
7. GDPR & CCPA Compliance
We comply with GDPR (EU), CCPA (California), and similar privacy laws by:
- Collecting minimal personal data
- Processing data only with your implicit consent (by using the site)
- Not selling or sharing personal data
- Providing transparent privacy policies
If you are an EU resident, you have additional rights under GDPR. If you are a California resident, you have rights under CCPA. Contact us to exercise these rights.
8. Children's Privacy
This Service is not intended for children under 13. We do not knowingly collect information from children under 13. If we learn that we have collected personal information from a child under 13, we will delete such information promptly.
9. Third-Party Links
This site may link to external websites (e.g., health resources, scientific articles). We are not responsible for their privacy practices. We recommend reviewing their privacy policies before visiting.
10. Contact Us
If you have questions about this Privacy Policy, requests to access/delete data, or privacy concerns, please contact us:
- Email: privacy [at] ifwindowcalculator.com
- Mailing address: Available upon request
11. Changes to This Policy
We may update this Privacy Policy from time to time. We will notify you of material changes by updating the "Last updated" date at the top of this page. Continued use of the Service after changes constitute your acceptance of the updated policy.
12. Additional Information for Specific Jurisdictions
California (CCPA)
You have the right to know, delete, and opt-out of the sale of your personal information. Because we do not collect or sell personal data, these rights are minimally applicable. Contact us if you wish to verify.
European Union (GDPR)
We are compliant with GDPR. You have the right to access, rectify, erase, restrict processing, data portability, and objection. Contact us to exercise these rights.
Canada (PIPEDA)
We comply with PIPEDA requirements for privacy protection and accountability.
Thank You
Thank you for trusting us with your health journey. We are committed to protecting your privacy and building a tool that respects your data and autonomy.