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Privacy Policy

[Last Modified: October 31, 2025]

1. Introduction

Welcome to JanusPrep.AI. We respect your privacy and are committed to protecting your personal data. This privacy policy explains how we collect, use, and safeguard your information when you use our service.

2. Information We Collect

Information You Provide

  • Email address for authentication and report delivery

  • Project information and requirements for cost estimation

  • Any additional information you choose to provide in your project details

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Information Automatically Collected

  • Essential cookies for authentication and app functionality

  • Technical information necessary for the service to function

  • Usage data through PostHog analytics, which uses browser local storage.

3. How We Use Your Information

We use your information for:

  • Providing and maintaining our service

  • Authenticating your identity

  • Generating and delivering cost estimation reports

  • Improving our service through anonymized usage analytics

  • Communicating with you about your projects and our service

4. Data Storage and Security

  • All data is stored securely using industry-standard encryption

  • Communications are protected using HTTPS

  • We use Supabase for secure data storage and authentication

  • We do not sell or share your data with third parties without your explicit consent

5. Cookies

We use essential cookies solely for:

  • Authentication purposes

  • Maintaining your session

  • Essential app functionality

We do not use cookies for advertising or tracking purposes.

6. Your Rights

You have the right to:

  • Access your personal data

  • Request correction of your data

  • Request deletion of your data

  • Withdraw consent for data processing

  • Request data portability

You can exercise these rights through your profile page or by contacting us.

7. Data Deletion

You can request data deletion through your profile page. Upon request, we will delete:

  • Your email and authentication information

  • All project data and estimations

  • Any other personal information associated with your account

8. International Data Transfer

While our company is based in Vietnam, we serve users globally. By using our service, you consent to your data being stored and processed in various jurisdictions as necessary to provide our service.

9. Future Updates

When payment features are implemented, we will:

  • Process payments through secure third-party providers

  • Collect only necessary payment information

  • Update this policy with specific details about payment data handling

10. Changes to This Policy

We will notify you of any changes to this privacy policy by:

  • Posting the new policy on this page

  • Updating the “Last Updated” date at the top of this document

  • Sending email notifications for significant changes that affect your rights or how we handle your data

Your continued use of JanusPrep.AI after any changes to this policy constitutes acceptance of these changes.

11. Contact Us

If you have any questions about this privacy policy or our data practices, please contact us at support@greblackbook.com

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