Privacy Policy

1. Who We Are

EigenDex (“we”, “our”, “us”) operates the website eigendex.com, an educational platform for ETF analysis, portfolio overlap, backtesting, and price correlations. We do not require registration, and we do not sell your data.

Questions about this policy? Contact us at contact@eigendex.com.

2. Information We Collect

2.1 Automatically Collected Data

When you visit EigenDex, our analytics and hosting infrastructure may automatically collect:

• Pages visited and time spent on each page
• Referring website or search query that brought you here
• Browser type and version, operating system
• Approximate geographic location (country and region — not street address)
• Device type (desktop, mobile, tablet)
• IP address (anonymized before storage)

This data is collected through Google Analytics, Vercel Analytics, Microsoft Clarity, and Ahrefs Analytics (described in Section 4).

2.2 Data You Voluntarily Provide

• Email address — if you sign up for our newsletter or Pro waitlist. Used only to send product updates. Never sold or shared with third parties.
• Portfolio inputs (ETF tickers, allocations, CSV uploads) — processed in your browser or transiently on our servers for analysis. We do not store or log your portfolio data.

3. Cookies

We use cookies and similar tracking technologies for the following purposes:

You can control or disable cookies through your browser settings. Note that disabling cookies may affect the functionality of some features on this site.

4. Third-Party Services

We use the following third-party services. Each has its own privacy policy:

5. How We Use Your Data

We use the data we collect to:

• Understand how our tools are used so we can improve them
• Monitor and maintain site performance and security
• Send product updates to users who signed up for our newsletter (email only)
• Display relevant advertising through Google AdSense
• Detect and prevent fraudulent or abusive behavior

We do not sell your personal information to third parties. We do not use your data to build advertising profiles. We do not combine analytics data with any personally identifying information.

6. Data Retention

• Analytics data: Retained for 26 months by Google Analytics, then automatically deleted.
• Email addresses: Retained until you request deletion.
• Portfolio inputs: Not stored — processed in real time only.
• Server logs: Retained for up to 30 days for security and debugging purposes.

7. Your Rights

Depending on your location, you may have the right to:

• Access the personal data we hold about you
• Correct inaccurate data
• Delete your data (right to be forgotten)
• Opt out of email communications at any time
• Object to processing of your data for direct marketing

To exercise any of these rights, contact us at contact@eigendex.com. For GDPR requests, we will respond within 30 days.

8. Children's Privacy

EigenDex is not directed at children under 13 years of age. We do not knowingly collect personal information from children under 13. If you believe a child has provided us with personal information, please contact us at contact@eigendex.com and we will delete it promptly.

9. International Data Transfers

EigenDex is operated from the United States. If you are visiting from outside the US, your data may be transferred to and processed in the US. By using the site, you consent to this transfer. We ensure appropriate safeguards are in place for any international transfers through our third-party service agreements.

10. Changes to This Policy

We may update this Privacy Policy from time to time. We will indicate the date of the most recent revision at the top of this page. Your continued use of EigenDex after changes are posted constitutes your acceptance of the updated policy.

11. Contact Us

For any privacy-related questions, concerns, or requests: