Privacy Policy & Cookie Disclosures

1. Introduction & Data Controller Details

This Privacy Policy describes the policies and procedures of SleepCalculator (“we,” “us,” or “our”) regarding the collection, use, and disclosure of technical and session information when you use https://sleepcalculator-virid.vercel.app (the “Website” or “Service”).

For the purposes of the General Data Protection Regulation (GDPR) and international privacy frameworks, the Data Controller is:

• Entity: SleepCalculator Research & Operations Team
• Designated Privacy Contact: privacy@sleepcalculator.com
• Response Window: We respond to all verified consumer and data subject inquiries within thirty (30) calendar days.

2. Google AdSense, DoubleClick & Advertising Policy Disclosures

A. Third-Party Ad Networks & Opt-Out Portals

In addition to Google, third-party ad networks and certified vendors may serve advertisements and measure ad performance on this site. You can opt out of third-party vendor cookies for personalized advertising by visiting any of the following centralized industry opt-out portals:

• Digital Advertising Alliance (DAA - United States): https://optout.aboutads.info
• Network Advertising Initiative (NAI): https://optout.networkadvertising.org
• European Interactive Digital Advertising Alliance (EDAA - EU/EEA/UK): https://www.youronlinechoices.eu
• Digital Advertising Alliance of Canada (DAAC - Canada): https://youradchoices.ca/en/tools
• Australian Digital Advertising Alliance (ADAA - Australia): https://www.youronlinechoices.com.au

B. Google EU User Consent Policy Compliance (EEA & UK)

For visitors accessing our Website from the European Economic Area (EEA), United Kingdom (UK), or Switzerland, we comply fully with Google's EU User Consent Policy. Cookies for personalized advertising are only placed when explicit, unambiguous affirmative consent is provided. Users may adjust or withdraw consent at any time via our on-page cookie preferences banner or browser settings.

C. Web Beacons, Pixels & Action Tags

Our advertising partners may utilize web beacons (also known as clear GIFs or single-pixel tags) in conjunction with cookies to analyze traffic, prevent click fraud, verify ad impressions, and evaluate the effectiveness of ad placements. Web beacons do not capture personally identifiable health data or your calculator schedule queries.

D. No Collection or Transmission of Calculator Inputs for Advertising

We strictly prohibit passing, logging, or transmitting raw calculator input values, bedtime parameters, wake-up schedules, or numerical calculation results to Google AdSense, third-party advertising networks, or analytics providers. All sleep calculations execute entirely on your device via client-side JavaScript, ensuring complete confidentiality of your sleep routines and personal timing data.

3. Complete Cookie Policy & Classification Table

Cookies and local storage keys are utilized on SleepCalculator according to strict functional necessity and applicable consent standards:

4. Information We Collect & Zero Personal Health Storage

A. Real-Time Calculator Inputs (Client-Side Only)

When you select wake-up hours, bedtime targets, sleep latency buffers, or invoke the “Sleep Now” algorithm, calculations occur entirely within client-side JavaScript in your browser. Your specific sleep times, routines, and habits are never logged to our servers or transmitted to remote databases.

B. Automatically Collected Technical Logs

Standard internet transmission protocols generate transient technical data when contacting our CDN servers:

• Anonymized IP Addresses: Used ephemerally for geolocation routing, edge caching, and DDoS defense.
• Device & User Agent Strings: Browser version, operating system, and screen dimensions for proper CSS layout rendering.
• Diagnostic Diagnostics: HTTP status codes, request timestamps, and referrer headers.

5. General Data Protection Regulation (GDPR) — EU & UK Rights

Visitors located in the European Economic Area (EEA), United Kingdom (UK), or Switzerland are protected by statutory rights under the EU GDPR (Regulation 2016/679) and UK Data Protection Act 2018:

• Legal Bases for Processing (Art. 6): Essential operations (security and site rendering) rely on Legitimate Interests (Art. 6(1)(f)). Non-essential advertising and analytics cookies rely on explicit Consent (Art. 6(1)(a)).
• Right of Access (Art. 15): Request verification of personal data held.
• Right to Rectification (Art. 16): Request correction of inaccurate information.
• Right to Erasure (Art. 17): Request deletion of personal records (“Right to be Forgotten”).
• Right to Restriction (Art. 18) & Portability (Art. 20): Restrict processing or receive data in a standard format.
• Right to Object (Art. 21): Object to data processing based on legitimate interests or direct marketing.
• Right to Withdraw Consent: Revoke cookie consent at any time without penalty.
• Right to Lodge a Complaint: Lodge a formal grievance with your local EU Data Protection Authority or the UK Information Commissioner's Office (ICO).

6. California Consumer Privacy Act (CCPA) & CPRA Disclosures

Under the California Consumer Privacy Act of 2018 as amended by the California Privacy Rights Act of 2020 (“CCPA/CPRA”), California residents are provided specific disclosures:

• Categories Collected: Online identifiers (IP address, device cookies) and internet activity (pageviews). Zero protected medical data or sensitive personal information (SPI) is collected.
• Do Not Sell or Share Notice: We do not sell personal data for monetary compensation. To opt out of third-party cookie sharing for cross-context behavioral advertising, use our cookie banner, visit optout.aboutads.info, or enable the Global Privacy Control (GPC) browser signal, which we automatically honor.
• Consumer Rights: Right to Know, Right to Delete, Right to Correct, and Right to Non-Designation for exercising privacy rights.
• Authorized Agents: Authorized representatives may submit requests with verified written permission.

7. Children's Online Privacy Protection Act (COPPA)

SleepCalculator is intended for a general audience and does not knowingly collect personal identifiable information from children under 13 years of age (or under 16 where applicable). If you believe a minor has submitted personal information, please contact privacy@sleepcalculator.com for immediate deletion.

8. Editorial Integrity & Advertising Independence

Advertisements delivered by Google AdSense displayed on this website are strictly demarcated with clear “Sponsored” or “Ad” identifiers. Advertising partnerships do not influence our scientific sleep cycle formulas, editorial guidelines, or sleep research citations.

9. Security Safeguards & Data Retention

We implement modern technical protections including TLS 1.3 encryption in transit, strict Content Security Policies (CSP), HTTP Strict Transport Security (HSTS), and isolated client-side computation. Standard CDN server access logs are automatically rotated and purged within 30 days.

10. Contact Information & Privacy Requests

To submit a privacy rights request (GDPR, CCPA/CPRA) or for questions regarding our Google AdSense compliance: