Privacy Policy

Last Updated: January 2026

Summary (Plain English)

We believe in being straightforward about privacy. Here's the short version:

  • We don't collect your personal health data. The dates and cycle information you enter into our calculator are processed entirely in your web browser using JavaScript. This data never leaves your device and is never transmitted to our servers.
  • Calculations happen locally. When you use the ovulation calculator, all the math happens on your computer or phone. We have no access to your menstrual cycle dates, fertile window results, or any other calculation outputs.
  • Nothing is stored. When you close the browser tab, your calculator inputs disappear. We don't save your data, create profiles, or track your fertility information over time.
  • No account required. You can use all features of our calculator without signing up, logging in, or providing any personal information.

The rest of this policy provides more detail about the limited data that may be collected through standard web hosting and analytics.

Information We Don't Collect

To be clear about what we do NOT collect or store:

  • No menstrual cycle data: Your last period date, cycle length, period duration, and any other information you enter into the calculator is not transmitted to us.
  • No fertility tracking: We don't track your ovulation dates, fertile windows, or pregnancy-related calculations.
  • No health information: We have no access to any health-related data you may enter or view on our site.
  • No accounts or profiles: We don't require registration and don't maintain user accounts or profiles.
  • No personal identifiers: We don't collect names, email addresses, or any personal information unless you voluntarily contact us.

Your sensitive fertility and health information stays on your device and under your control.

How We Compare to Fertility Apps

Many popular fertility apps collect extensive personal health data. Here's how our privacy practices compare:

Data Practice Our Calculator Flo Clue Ovia Natural Cycles
Menstrual data stored on servers No Yes Yes Yes Yes
Account/login required No Yes Yes Yes Yes
Data shared with third parties No Limited Limited Yes Limited
Health data sold/monetized No Anonymized No Anonymized No
Location tracking No Yes Optional Yes No
Data deletion available N/A (nothing stored) Yes (request) Yes (in-app) Yes (request) Yes (in-app)
End-to-end encrypted N/A (local only) No No No Partial

We believe sensitive reproductive health data should stay on your device. Our calculator processes everything locally in your browser—no accounts, no cloud storage, no data sharing. Learn more about our approach on our About page.

Health Data Privacy Laws Around the World

Understanding which laws protect your reproductive health data can help you make informed decisions about which tools and apps to use. Below is a comparison of major health data privacy regulations:

Regulation Region Health Data Classification Key Protections Enforcement
GDPR European Union Health data is a "special category" requiring explicit consent Right to access, delete, port data; mandatory breach notifications within 72 hours; data minimization principle Fines up to 4% of global revenue or €20M
CCPA/CPRA California, USA Sensitive personal information (includes health data under CPRA) Right to know, delete, opt out of sale; limit use of sensitive data; non-discrimination $2,500-$7,500 per violation; private right of action for data breaches
HIPAA United States Protected Health Information (PHI) from covered entities only Applies to healthcare providers, insurers, and their business associates; does NOT apply to consumer apps or websites like ours $100-$50,000 per violation; criminal penalties for willful neglect
UK Data Protection Act 2018 United Kingdom Health data is special category data, similar to GDPR Mirrors GDPR protections post-Brexit; right to access, rectification, and erasure Enforced by the Information Commissioner's Office (ICO)
PIPEDA Canada Sensitive personal information requiring meaningful consent Purpose limitation, consent requirements, individual access rights Enforced by the Office of the Privacy Commissioner
Important distinction: HIPAA only applies to healthcare providers and their business associates. Consumer websites and apps—including fertility trackers—are generally not covered by HIPAA. This means most fertility apps have fewer legal obligations to protect your health data than you might assume. Our approach of processing all data locally in your browser sidesteps this concern entirely.

Information That May Be Collected

While we don't collect personal health data, some information may be collected through standard web technologies:

Analytics

We may use analytics services to understand how visitors use our site in aggregate. This typically includes:

  • Pages visited and time spent on pages
  • General geographic region (country or city level, not precise location)
  • Device type (desktop, mobile, tablet)
  • Browser type and operating system
  • Referring website (how you found us)

This data is aggregated and anonymized. It helps us understand which pages are popular and how to improve the site, but it doesn't identify you personally or track your individual behavior.

Server Logs

Like most websites, our hosting provider may automatically collect standard server log information, including IP addresses, browser type, and pages requested. This is standard for web hosting and is used for security and troubleshooting purposes.

Contact Data

If you choose to contact us via email at info@calculateovulation.org, the information you include in your message (your name, email address, and message content) is received directly through our email provider. We use this data solely to respond to your inquiry. We do not share your contact information with third parties, add you to marketing lists, or use your information for any purpose other than addressing your message.

Email correspondence is retained only as long as necessary to respond to your inquiry and for our records. You may request deletion of your contact data at any time.

Third-Party Services

Our website uses the following third-party services:

Vercel (Hosting)

Our website is hosted on Vercel. Vercel may collect standard server logs and analytics as part of their hosting service. For more information, see Vercel's Privacy Policy.

Advertising (If Applicable)

If we display advertisements on our site, ad networks may use cookies and similar technologies to serve relevant ads based on your browsing activity across the web. You can opt out of personalized advertising through your browser settings or through industry opt-out tools.

Cookies

Cookies are small text files stored on your device by websites you visit. Here's how we use them:

Essential Cookies

We may use cookies that are strictly necessary for the website to function properly. These don't collect personal information and are required for basic site operations.

Analytics Cookies

If we use analytics services, they may set cookies to distinguish unique visitors and track usage patterns. These cookies don't identify you personally.

Third-Party Cookies

Third-party services (such as ad networks) may set their own cookies. We don't control these cookies, and they are subject to those third parties' privacy policies.

Managing Cookies

You can control cookies through your browser settings. Most browsers allow you to block or delete cookies. However, blocking all cookies may affect your experience on some websites.

Your Rights

You have the right to:

  • Access: Request information about any personal data we may hold about you (primarily limited to contact form submissions).
  • Deletion: Request deletion of any personal data we hold, such as contact form submissions.
  • Correction: Request correction of inaccurate personal data.
  • Opt-out: Opt out of analytics tracking by using browser privacy settings, ad blockers, or "Do Not Track" features.

To exercise these rights, please contact us at info@calculateovulation.org. We will respond to your request within a reasonable timeframe.

Your Data Rights by Region

Depending on where you live, specific data protection regulations may provide you with additional rights:

Region Regulation Key Rights How to Exercise
European Union GDPR Access, deletion, portability, restriction, objection to processing Email us at info@calculateovulation.org; response within 30 days
California, USA CCPA / CPRA Know what's collected, delete data, opt out of sale, non-discrimination Email us; we don't sell personal data
United States (General) No federal law (HIPAA applies to healthcare providers only) Varies by state; FTC protections apply Email us for any data-related requests
All Regions Our commitment Since we don't collect health data, most regulations have minimal impact—but we honor all requests Email info@calculateovulation.org

Because our calculator processes all data locally in your browser, most data protection regulations have limited applicability—we simply don't have your data to protect. For information about our hosting and form services' data practices, see the links below.

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 are a parent or guardian and believe your child has provided us with personal information through the contact form, please contact us and we will delete that information.

Changes to This Policy

We may update this Privacy Policy from time to time to reflect changes in our practices or for other operational, legal, or regulatory reasons. When we make changes, we will update the "Last Updated" date at the top of this page. We encourage you to review this policy periodically.

Continued use of the website after changes constitutes acceptance of the updated policy.

Related Pages

For more about how we operate and protect your interests:

  • Terms of Service — Rules and limitations for using our calculator
  • About Us — Why we built a privacy-focused calculator
  • Contact Us — Questions about privacy? Reach out

External privacy resources:

Contact Us

If you have questions or concerns about this Privacy Policy or our data practices, please contact us:

Email: info@calculateovulation.org

We take privacy concerns seriously and will respond to your inquiry as promptly as possible.

Your Rights Under GDPR and CCPA

Both the General Data Protection Regulation (GDPR) in the European Union and the California Consumer Privacy Act (CCPA) in the United States grant individuals specific rights regarding their personal data. The table below outlines these rights and how our privacy practices align with each.

Right GDPR CCPA How We Comply
Right of Access You can request a copy of all personal data a company holds about you (Article 15) You can request disclosure of the categories and specific pieces of personal information collected (Section 1798.100) Because our calculator processes data locally in your browser, we hold virtually no personal data. If you have contacted us via email, you may request a copy of that correspondence at any time.
Right to Deletion You can request erasure of your personal data ("right to be forgotten") (Article 17) You can request deletion of personal information collected about you (Section 1798.105) We honor all deletion requests promptly. Since we do not store calculator inputs, the only data we may hold is email correspondence, which we will delete upon request.
Right to Data Portability You can receive your data in a structured, commonly used, machine-readable format (Article 20) Not explicitly required, though access rights cover similar ground Your calculator data never leaves your device, so there is nothing to port. Any email correspondence we hold can be provided to you in a standard format on request.
Right to Opt-Out of Sale Not framed as "sale," but consent is required for most data processing (Article 6) You can opt out of the sale or sharing of your personal information (Section 1798.120) We do not sell, share, or trade any personal information. There is no data sale to opt out of.
Right to Rectification You can request correction of inaccurate personal data (Article 16) You can request correction of inaccurate personal information (Section 1798.106, added by CPRA) If any data we hold about you (e.g., contact details from email) is inaccurate, email us and we will correct it immediately.
Right to Restrict Processing You can request that processing of your data be limited in certain circumstances (Article 18) No direct equivalent, though opt-out of sale serves a similar purpose We only process the minimal data required to respond to your inquiries. You can request we stop processing your contact data at any time.
Right to Non-Discrimination Covered under broader anti-discrimination principles A business cannot discriminate against you for exercising your rights (Section 1798.125) Exercising any privacy right will never affect your access to our free calculator or any other service we offer.
Right to Be Informed You must be told what data is collected and how it is used (Articles 13-14) You must be notified at or before the point of collection (Section 1798.100) This privacy policy serves as our full disclosure. We are transparent about what we collect (very little) and how we use it.

To exercise any of these rights, contact us at info@calculateovulation.org. We respond to all requests within 30 days. For more information about your rights, visit the official GDPR resource or the California Attorney General's CCPA page.

Reproductive Health Data: Why Privacy Matters

Fertility and reproductive health data is among the most sensitive personal information you can share. Unlike a browsing history or a shopping preference, data about your menstrual cycle, ovulation patterns, and pregnancy intentions reveals deeply private aspects of your life -- information that, in the wrong hands, can be used to make inferences about your health decisions, family planning, and personal beliefs.

In recent years, concerns about reproductive health privacy have intensified. Data collected by fertility tracking apps has been subpoenaed by law enforcement, shared with data brokers, and used in ways that users never anticipated when they first entered their cycle dates. For individuals in regions where reproductive healthcare access is restricted, this kind of data exposure can carry real and serious consequences.

This is precisely why we built our ovulation calculator to process everything locally in your browser. By never transmitting your fertility data to a server, we eliminate the risk of that data being stored, breached, sold, or subpoenaed. There is no database of your cycle information for anyone to access -- not us, not advertisers, not third parties, and not government agencies.

Our commitment: Your menstrual cycle dates, ovulation estimates, and fertile window calculations never leave your device. We cannot share what we do not have.

If you would like to learn more about the broader landscape of reproductive health privacy and digital rights, the Electronic Frontier Foundation provides extensive coverage of these issues. Visit the EFF's Reproductive Health Privacy resource page for in-depth analysis, policy updates, and practical guidance on protecting your data.

How to Protect Your Fertility Data Online

Even with a privacy-focused tool like ours, it is important to take proactive steps to protect your reproductive health information across all the services and platforms you use. Here are four practical steps you can take today.

Use Private or Incognito Browsing

When searching for fertility-related topics, use your browser's private or incognito mode. This prevents your search history and site visits from being saved locally and reduces tracking by third-party cookies. It does not make you invisible online, but it is a meaningful first layer of protection.

Be Cautious with Fertility Apps That Collect Data

Many popular fertility and period tracking apps require accounts and store your health data on their servers. Before using any app, read its privacy policy carefully. Ask yourself: does this app need to store my data on a remote server, or could it work locally? Consider using tools -- like our calculator -- that keep your data on your device.

Understand Your Rights to Data Deletion

Under GDPR, CCPA, and an increasing number of state-level privacy laws, you have the right to request that companies delete the personal data they hold about you. If you have previously used a fertility app that stores your data, you can contact them and request full deletion of your account and all associated health records.

Keep Health Data Separate from Social Media

Avoid logging into health or fertility apps using social media accounts (e.g., "Sign in with Facebook" or "Sign in with Google"). This creates a link between your reproductive health data and your social media profile, enabling cross-platform data sharing. Use a dedicated email address for any health-related accounts to maintain separation.

Privacy Questions and Answers

Here are answers to common questions about how we handle data and protect your privacy:

No. Because all calculations happen locally in your browser, we have no stored fertility data to produce in response to a subpoena, court order, or law enforcement request. There is no database of your cycle dates, ovulation predictions, or fertile window calculations on our servers. This is by design -- we cannot share what we do not have.

In most cases, no. HIPAA only applies to "covered entities" -- healthcare providers, health insurers, and their business associates. Most consumer fertility apps and websites, including ours, are not covered by HIPAA. This means they have fewer legal obligations regarding your health data than many people assume. Some apps may voluntarily follow HIPAA-like practices, but they are not legally required to.

If our website were to shut down, there would be no impact on your personal data because we don't store it. Unlike apps that hold your health data on their servers (which could be sold, transferred, or left unsecured during a shutdown), our approach means your data exists only on your device during use and disappears when you close the browser tab.

We do not use browser fingerprinting techniques to identify individual users. If we use analytics services, they may place standard cookies, but these are used for aggregate, anonymous traffic analysis (page views, device types) and cannot be linked to your health data since we don't collect any. You can block analytics cookies using your browser settings or ad-blocking extensions without affecting calculator functionality.

Learn More: Related Pages and Articles

Explore our other pages and articles for more information about fertility tracking, your rights, and how we operate.

Site Pages

  • Ovulation Calculator -- Use our free, privacy-focused fertility tracking tool
  • About Us -- Learn why we built a privacy-first ovulation calculator and the principles behind our approach
  • Terms of Service -- Understand the rules and limitations governing use of our calculator
  • Contact Us -- Have a privacy question or data request? Get in touch directly

From Our Blog

External Privacy Resources