Privacy Policy

Last updated: May 4, 2026

Cornerstone ("we", "our", or "us") is committed to protecting your privacy. This Privacy Policy explains how we collect, use, disclose, and safeguard your information when you use our newsletter automation platform.

1. Information We Collect

We collect information you provide directly to us when you:

• Create an account (name, email address, agency name)
• Set up your brand profile (photo, brand colors, contact details)
• Import or add contacts (email addresses, names, phone numbers)
• Generate and send newsletters
• Subscribe to a paid plan (billing information handled by Stripe)

We also automatically collect certain information when you use our service, including log data, device information, and usage analytics.

2. How We Use Your Information

We use the information we collect to:

• Provide, maintain, and improve our services
• Generate AI-powered newsletters on your behalf
• Send newsletters to your contacts via Resend
• Process payments through Stripe
• Send you service-related communications
• Monitor and analyze usage patterns to improve the platform
• Comply with legal obligations

3. Information Sharing

We do not sell your personal information. We may share your information with:

• Supabase — our database and authentication provider
• Anthropic — AI content generation (newsletter content only, no personal contact data)
• Resend — email delivery service for sending your newsletters
• Stripe — payment processing (we never store your card details)
• Vercel — hosting and infrastructure

We may also disclose information when required by law or to protect our rights.

4. Your Contacts' Data

When you import contacts into Cornerstone, you are responsible for having the legal right to email those individuals. We store contact information (names, email addresses, phone numbers) securely in our database and use it solely to send newsletters on your behalf. We do not use your contacts' data for any other purpose.

Every newsletter sent through Cornerstone includes an unsubscribe link. When a contact unsubscribes, they are immediately removed from future sends.

5. Data Security

We implement industry-standard security measures including encrypted data storage, secure HTTPS connections, and row-level security in our database. However, no method of transmission over the internet is 100% secure.

6. Data Retention

We retain your information for as long as your account is active. If you delete your account, we will delete your data within 30 days, except where we are required to retain it for legal purposes.

7. Your Rights

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

• Access the personal information we hold about you
• Correct inaccurate information
• Request deletion of your information
• Object to or restrict our processing of your data
• Data portability

To exercise these rights, contact us at the email below.

8. Cookies

We use cookies and similar tracking technologies to maintain your session and improve your experience. You can control cookies through your browser settings.

9. Children's Privacy

Cornerstone is not directed to children under 13. We do not knowingly collect personal information from children under 13.

10. Changes to This Policy

We may update this Privacy Policy from time to time. We will notify you of any material changes by posting the new policy on this page and updating the "Last updated" date.

11. Contact Us

If you have questions about this Privacy Policy, please contact us at:

Cornerstone
Email: support@cornerstonenewsletter.com