プライバシーポリシー

At VarianceCalc, we are committed to protecting your privacy. This Privacy Policy explains what information we collect, how we use it, and how we keep it safe when you visit https://variancecalculator.net.

1. Information We Collect

Data You Enter Into Our Calculators

All calculations on VarianceCalc — including our Variance Calculator, Standard Deviation Calculator, Mean Calculator, and all other tools — are performed entirely in your browser. Your data values are never sent to our servers, stored in any database, or shared with anyone.

Contact Information

If you reach out through our Contact Form, we collect the information you provide (name, email address, and message) solely to respond to your inquiry. We do not use this information for marketing or share it with third parties.

Automatically Collected Data

Like most websites, our servers may automatically log basic technical information, including:

  • IP address (anonymized)
  • Browser type and version
  • Pages visited and time spent
  • Referring URL

This data is used solely for monitoring website performance, security, and improving user experience. It is not linked to any personally identifiable information.

2. Cookies and Local Storage

VarianceCalc uses cookies and local storage for the following purposes:

  • User Preferences: Saving your preferred calculator mode (Sample vs. Population) and theme settings (dark/light mode).
  • Cookie Consent: Remembering whether you have accepted the cookie notice.

These are stored locally on your device and are not shared with third parties. For more details, please see our Cookies Policy.

3. Third-Party Services

We may use the following third-party services on our website:

  • Google AdSense: To display relevant advertisements. Google may use cookies to serve ads based on your browsing activity. You can learn more and manage your preferences at Google's Ads Settings.
  • Google Analytics: To understand how visitors use our website. This data is anonymized and helps us improve our tools and content.
  • Web3Forms: To process contact form submissions securely.

Each third-party service operates under its own privacy policy. We encourage you to review them for details.

4. How We Use Your Information

Any information we collect is used to:

  • Respond to your questions and feedback via the Contact Form.
  • Monitor and improve website performance and security.
  • Analyze usage trends to enhance our calculator tools.
  • Display relevant advertisements through Google AdSense.

We do not sell, rent, or trade your personal information to anyone.

5. Data Security

We take reasonable measures to protect any information shared with us, including secure HTTPS connections across our website. However, no method of transmission over the internet is completely secure, and we cannot guarantee absolute security.

6. Children's Privacy

VarianceCalc is an educational tool suitable for users of all ages. We do not knowingly collect personal information from children under 13. If you believe a child has provided us with personal data, please contact us and we will promptly remove it.

7. Your Rights

You have the right to:

  • Request access to any personal data we hold about you.
  • Request deletion of your personal data.
  • Opt out of personalized advertising through your browser or Google's Ad Settings.
  • Clear cookies and local storage at any time through your browser settings.

8. Changes to This Policy

We may update this Privacy Policy from time to time. Any changes will be posted on this page. We recommend reviewing this page periodically to stay informed.

9. Contact Us

If you have questions about this Privacy Policy or how we handle your data, please reach out through our Contact Form or email us at contact@variancecalculator.net.