Privacy Policy

Last Updated: January 15, 2026

Introduction

Welcome to UL Sleep Calculator ("we," "our," or "us"). We are committed to protecting your privacy and ensuring transparency about how we handle your information. This Privacy Policy explains what information we collect, how we use it, and your rights regarding your data when you use our website at ul-sleep-calculator.com.

Information We Collect

Information You Provide

Our sleep system calculator is designed to work entirely in your browser. The calculations you perform—including your quilt temperature ratings, R-values, clothing layers, and sleep preferences—are processed locally on your device and are not transmitted to our servers or stored by us.

Automatically Collected Information

When you visit our website, we may automatically collect certain information about your device and browsing activity through cookies and similar technologies:

• Usage Data: Pages visited, time spent on pages, click patterns, and referring websites
• Device Information: Browser type, operating system, device type, and screen resolution
• Analytics Data: Aggregated statistics about how visitors use our calculator and website features
• IP Address: Your Internet Protocol address (which may indicate your general geographic location)

How We Use Your Information

We use the collected information for the following purposes:

• Improve Our Services: Understand how users interact with our calculator to make improvements and add new features
• Analytics: Analyze website traffic patterns and user behavior to optimize performance
• Security: Detect and prevent fraud, abuse, or technical issues
• Communications: Respond to your inquiries or feedback if you contact us

Cookies and Tracking Technologies

We use cookies and similar tracking technologies to enhance your browsing experience and collect usage analytics. Types of cookies we use include:

• Essential Cookies: Required for basic website functionality
• Analytics Cookies: Help us understand how visitors use our website (e.g., Google Analytics)
• Preference Cookies: Remember your settings like dark mode preferences

You can control cookies through your browser settings. Note that disabling certain cookies may affect website functionality.

Third-Party Services

We may use third-party service providers to help us operate our website and analyze usage. These services may include:

• Google Analytics: To analyze website traffic and user behavior. Google Analytics collects information anonymously and reports website trends. Learn more at Google's Privacy Policy.
• Hosting Services: Our website is hosted on Vercel. See Vercel's Privacy Policy.

Affiliate Links and Advertising

Our website may contain affiliate links to outdoor gear retailers. If you click on these links and make a purchase, we may earn a commission. This does not affect the price you pay or our commitment to providing unbiased information. We only recommend products we believe will be useful to our users.

Data Security

We implement reasonable security measures to protect the information we collect. However, no method of transmission over the Internet or electronic storage is 100% secure. While we strive to protect your information, we cannot guarantee its absolute security.

Data Retention

Since we do not collect or store your calculator inputs, there is no personal calculation data to retain. Analytics data is retained according to our third-party service providers' policies, typically for up to 26 months.

Your Rights and Choices

Depending on your location, you may have certain rights regarding your personal information:

• Access: Request access to the personal information we hold about you
• Correction: Request correction of inaccurate information
• Deletion: Request deletion of your personal information
• Opt-Out: Opt-out of certain data collection practices
• Cookie Control: Manage your cookie preferences through your browser settings

Children's Privacy

Our website is not directed to children under the age of 13. We do not knowingly collect personal information from children under 13. If you believe we have inadvertently collected such information, please contact us immediately.

International Users

Our website is operated from the United States. If you access our website from outside the United States, your information may be transferred to, stored, and processed in the United States or other countries. By using our website, you consent to this transfer.

Changes to This Privacy Policy

We may update this Privacy Policy from time to time. We will notify you of any significant changes by posting the new Privacy Policy on this page and updating the "Last Updated" date. We encourage you to review this Privacy Policy periodically.

Contact Us

If you have any questions, concerns, or requests regarding this Privacy Policy or our data practices, please contact us at:

Email: privacy@ul-sleep-calculator.com

Website: ul-sleep-calculator.com