Privacy Policy

Last updated: March 6, 2026

Zeroth ("we", "our", or "us") operates the Zeroth mobile application. This Privacy Policy explains how we collect, use, and protect your information when you use our app.

1. Information We Collect

Account Information: When you create an account, we collect your email address, username, and password. Your password is securely hashed and never stored in plain text.

Usage Data: We collect information about your interactions with the app, including:

• Questions answered and performance metrics (correct/incorrect, time taken)
• Daily challenge completions and streak data
• Achievement progress and points earned
• App usage patterns (screens visited, session duration)

Device Information: We may collect your device type, operating system version, and timezone for functionality purposes (e.g., daily challenge resets, streak tracking).

2. How We Use Your Information

We use the collected information to:

• Provide, maintain, and improve the Zeroth app
• Track your learning progress, streaks, and achievements
• Power leaderboards and rankings
• Send transactional emails (verification codes, password resets)
• Personalize your experience (e.g., weak area recommendations)

3. Data Sharing

We do not sell your personal information to third parties. We may share limited data with:

• Service providers: Email delivery (Resend) for transactional emails only
• Legal requirements: If required by law or to protect our rights

Your username, points, and rank are visible on public leaderboards. No other personal information is publicly displayed.

4. Data Security

We implement industry-standard security measures:

• All data transmitted over HTTPS encryption
• Passwords hashed using bcrypt
• Authentication tokens stored securely on your device
• Database access restricted to authorized services only

5. Data Retention

We retain your data for as long as your account is active. If you request account deletion, your personal data will be permanently removed within 30 days. Anonymized, aggregated data (e.g., total question answer counts) may be retained indefinitely.

6. Your Rights

You have the right to:

• Access your personal data
• Correct inaccurate information
• Delete your account and associated data
• Export your data upon request

To exercise these rights, contact us at privacy@zeroth.pro.

7. Children's Privacy

Zeroth is not intended for children under 13. We do not knowingly collect data from children under 13. If you believe a child has provided us with personal information, please contact us and we will promptly delete it.

8. Third-Party Services

The app uses the following third-party services:

• Resend: For sending verification and password reset emails
• Expo: For app distribution and updates

These services have their own privacy policies governing their use of data.

9. Changes to This Policy

We may update this Privacy Policy from time to time. We will notify you of significant changes by posting the new policy in the app or on our website. Continued use of the app after changes constitutes acceptance of the updated policy.

10. Contact Us

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

• Email: privacy@zeroth.pro
• Website: zeroth.pro