Privacy Policy

Last updated: March 27, 2026

1. Introduction

Callimachus ("we", "our", "us") is committed to protecting your privacy. This Privacy Policy explains how we collect, use, disclose, and safeguard your information when you use our reading application. Please read this policy carefully.

2. Information We Collect

We collect the following types of information:

• Account Information: Email address and password (encrypted) when you create an account
• User Content: Documents you upload (PDF, TXT, DOCX, HTML files)
• Reading Data: Bookmarks, reading progress, page positions
• Preferences: Font size, bold/italic settings, theme preferences
• Usage Data: How you interact with the App (features used, time spent reading)
• Device Information: Browser type, operating system, device type

3. How We Use Your Information

We use your information to:

• Provide, maintain, and improve the App's functionality
• Process and display your uploaded documents for reading
• Save your reading progress and preferences
• Authenticate your account and protect against unauthorized access
• Analyze usage patterns to improve user experience
• Communicate important updates about the App

4. Data Storage and Security

We implement robust security measures to protect your data:

• Passwords are hashed and encrypted using industry-standard algorithms
• Data transmission is encrypted using HTTPS/TLS protocols
• Your documents are stored securely with access controls
• Regular security audits and updates
• Data stored locally on your device when applicable

5. Cookies and Local Storage

6. Third-Party Services

We use the following third-party libraries that may collect data:

• PDF.js: For PDF rendering and text extraction (Mozilla open-source)
• Mammoth.js: For DOCX file processing
• Font Awesome: For icons (CDN may collect basic usage data)
• Google Fonts: For typography (may collect IP addresses)

7. Data Sharing and Disclosure

We do not sell, trade, or rent your personal information to third parties. We may share data only:

• To comply with legal obligations
• To protect our rights and safety
• With your explicit consent
• With service providers who assist in App operations (under strict confidentiality)

8. Your Rights

You have the right to:

• Access your personal data stored with us
• Correct inaccurate information
• Delete your account and associated data
• Export your reading data
• Opt out of non-essential data collection

To exercise these rights, contact us at privacy@callimachus.app

9. Data Retention

We retain your data as long as your account is active. If you delete your account, we will delete or anonymize your data within 30 days, except where retention is required by law.

10. Children's Privacy

Our App is not intended for children under 13. We do not knowingly collect personal information from children under 13. If you believe we have collected such data, please contact us immediately.

11. International Data Transfers

Your information may be transferred to and processed in countries other than your own. We ensure appropriate safeguards are in place to protect your data in accordance with this policy.

12. Changes to This Policy

We may update this Privacy Policy periodically. We will notify you of significant changes through the App or via email. Continued use of the App after changes constitutes acceptance of the new policy.

13. Contact Us

If you have questions about this Privacy Policy or our data practices, please contact:

privacy@callimachus.app
Data Protection Officer: dpo@callimachus.app