Privacy Policy: Zero Tracking and Client-Side Security
Transparent notice: we collect no personal data, run calculations locally, and respect your privacy.
Our Commitment to User Privacy
At Sleep Hours Calculator (sleephourscalculator.com), we believe that digital privacy is a fundamental human right. You should be able to calculate your sleep schedule, plan wake-up alarms, and explore evidence-based sleep wellness without giving away your personal identity or personal information.
This Privacy Policy document clearly explains what minimal data is processed when you visit our website, how that data is handled, and our strict commitment to zero tracking. By using our website, you accept the simple, privacy-focused practices outlined here. We do not sell, rent, trade, or share any visitor details with commercial marketing brokers.
No Account Registration and No Personal Data Collection
We do not require user accounts, email sign-ups, phone numbers, or passwords. You can access every calculator, guide, and data chart on this website completely anonymously.
All calculations, including target bedtime projections, wake-up schedules, nap durations, and caffeine cutoff estimates, are executed locally on your own personal device through client-side JavaScript. Your inputted sleep times and personal preferences are never transmitted to our servers or stored in any remote database. You never have to worry about private sleep habits leaking onto third-party platforms.
Local Browser Storage Usage
Our website uses browser LocalStorage and SessionStorage solely to enhance your direct browsing experience on your device:
- ✓ Theme Preference (shc_user_theme): Saves your chosen light or dark visual theme mode so your preferred appearance persists when you change pages.
- ✓ Clock Format (shc_format): Stores your choice of 12-hour or 24-hour military clock display.
- ✓ Custom Cycle Length (shc_cycle): Saves your preferred cycle duration inside Advanced Settings.
- ✓ Feedback Dismissal (shc_feedback_closed): Remembers if you dismissed the quick feedback box during your current browsing session so it does not pop up again while you read.
These settings remain strictly on your local device. We have no technical access to this information, and you can clear it at any time by clearing your web browser cache.
Server Access Logs and Hosting
Like all web servers across the internet, our hosting infrastructure automatically collects standard technical connection logs when pages load. These standard logs may include your device internet protocol (IP) address, browser family, operating system, referring page URL, and page request timestamps.
We review these technical server logs strictly for security monitoring, detecting bot traffic attacks, and ensuring fast website delivery. We never combine access logs with any individual identity records. Access logs are purged on a rolling schedule to prevent unnecessary data retention.
Cookies and Third-Party Tracking Scripts
Sleep Hours Calculator does not utilize tracking cookies, behavioral advertising beacons, or third-party marketing pixels. We believe the modern internet has become too invasive, and we choose to keep our platform clean, lightweight, and respectful of your attention.
Our guides occasionally reference peer-reviewed research papers and health organizations such as the Centers for Disease Control (CDC) and the American Academy of Sleep Medicine (AASM). When you click an external link pointing away to another domain, you become subject to that external site privacy policies. We encourage you to review their specific policies upon visiting.
Children Online Privacy Protection
Our website provides educational sleep duration benchmarks for parents and caregivers regarding children and toddlers. However, we do not knowingly collect, solicit, or maintain data on children under the age of thirteen. Since our tools do not collect personal identities at all, parents can safely use our guides to assist family sleep planning without privacy concerns.
Contacting Us Regarding Privacy
If you have questions, feedback, or concerns regarding this Privacy Policy, please send an email message to: privacy@sleephourscalculator.com.
Policy Effective Date: October 2026. Updated periodically to reflect web standards.