Privacy Policy

Last updated: April 20, 2026.

This Privacy Policy describes how CircadianStack (“we,” “us,” or “our”) collects, uses, and shares information when you visit circadianstack.com.

1. Information we collect

Information you provide: When you subscribe to our newsletter, we collect your email address and any preferences you share.

Information collected automatically: Like most websites, we collect standard web analytics: pages visited, referring URL, approximate location (country, region), device type, browser, and anonymized session identifiers. We do not collect your name, precise location, or any data that directly identifies you.

Cookies: We use a small number of cookies, one for session continuity, one for analytics, and (where applicable) one to remember your cookie consent choice. We do not use third-party advertising cookies.

2. How we use it

• To deliver the site and the newsletter
• To understand which content is useful and which isn't
• To improve the product
• To comply with legal obligations

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

3. Third parties

We use the following third-party services:

• Vercelhosting and delivery
• Neonanalytics database (anonymized traffic data only)
• Beehiivnewsletter delivery
• Supabaseasset storage (images, PDFs)
• Google Search Console / Bing Webmaster ToolsSEO performance data (no personal information collected via these)

Each of these operates under its own privacy policy.

4. Affiliate links

Some product links on this site are affiliate links. When you click one and make a purchase, the retailer may share information with us about the transaction (product, date, commission). We do not receive your name, address, or payment information.

See our Affiliate Disclosure for more detail.

5. Your rights

Depending on your location, you may have rights under the GDPR (EU/UK), CCPA (California), or other privacy laws. These may include:

• The right to access information we hold about you
• The right to correct or delete that information
• The right to object to or restrict processing
• The right to data portability
• The right to withdraw consent at any time

To exercise any of these rights, email us at privacy@circadianstack.com. We respond within 30 days.

6. Children

CircadianStack is not directed at children under 13. We do not knowingly collect information from children under 13. If we learn we have collected such information, we will delete it.

7. Data retention

We retain newsletter subscriber data until you unsubscribe. We retain anonymized analytics data indefinitely. We retain correspondence (such as corrections or feedback) for up to 3 years.

8. Security

We protect your information with standard industry safeguards, including encryption in transit (HTTPS) and access controls on our databases. No system is perfectly secure, if a breach occurs, we will notify affected users consistent with applicable law.

9. Changes

We may update this Privacy Policy. Material changes will be highlighted on this page with a new “Last updated” date.

10. Contact

Questions? Email privacy@circadianstack.com.