AI Diagram

Privacy Policy

Last updated: February 2026

1. Information We Collect

Account Information

When you create an account, we collect your email address and name through our authentication provider (Clerk). We do not store passwords directly.

Usage Data

We collect information about how you use the Service, including diagram generation requests, the number of credits used, and feature usage patterns. This data helps us improve the Service.

Diagram Data

When you are not signed in, all diagram data is stored locally in your browser and never sent to our servers (except the text prompt sent for AI generation). When signed in, project data is stored on our cloud servers for sync purposes.

Payment Information

Payment processing is handled by Paddle. We do not store your credit card number or payment details. Paddle may collect billing information as described in their privacy policy.

2. How We Use Your Information

We use the information we collect to:

  • Provide, maintain, and improve the Service.
  • Process payments and manage your subscription.
  • Track credit usage and enforce plan limits.
  • Send important service-related notifications.
  • Respond to support requests.
  • Detect and prevent fraud or abuse.

3. AI Processing

When you generate a diagram, your text prompt is sent to third-party AI providers (such as OpenAI, Anthropic, or Google) for processing. These providers process the prompt to generate diagram data. We recommend not including sensitive, confidential, or personally identifiable information in your prompts.

4. Data Storage and Security

Cloud project data is stored on secure servers using Neon PostgreSQL. User-uploaded files are stored in Amazon S3. We use industry-standard encryption and security measures to protect your data.

Local-only data (when not signed in) is stored in your browser's localStorage and is not transmitted to our servers.

5. Third-Party Services

We use the following third-party services:

  • Clerk — authentication and user management.
  • Paddle — payment processing, subscriptions, and tax compliance.
  • OpenAI, Anthropic, Google — AI model providers for diagram generation.
  • Neon — database hosting.
  • Amazon Web Services — file storage (S3).

Each of these services has its own privacy policy governing how they handle data.

6. Data Retention

We retain your account data and cloud projects for as long as your account is active. If you delete your account, we will delete your personal data and project data within 30 days. Payment transaction records may be retained for legal and accounting purposes.

7. Your Rights

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

  • Access the personal data we hold about you.
  • Request correction of inaccurate data.
  • Request deletion of your data.
  • Export your data in a portable format.
  • Object to or restrict processing of your data.

To exercise any of these rights, please contact us through the application.

8. Cookies

We use essential cookies for authentication and session management. We do not use tracking or advertising cookies.

9. Children's Privacy

The Service is not intended for children under the age of 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 users of material changes by posting the updated policy on this page with a new "Last updated" date.

11. Contact

If you have questions about this Privacy Policy or your data, please email us at support@calcstack.co or visit our Contact page.