Privacy Policy

1. Introduction

JLPT N5 Master ("we", "our", or "us") is committed to protecting your personal information. This Privacy Policy explains what data we collect, how we use it, and your rights regarding it. By using our service, you agree to the practices described in this policy.

2. Information We Collect

• Email address (for account registration and authentication)
• Learning data (accuracy rates, SRS review schedules, session history, streaks)
• Usage data (access timestamps, features used, device type)
• Payment information (processed by Stripe — we never store card numbers on our servers)

3. How We Use Your Information

• Providing and operating the service, including user authentication
• Optimizing your learning through our SRS (spaced repetition) algorithm
• Improving the service and developing new features
• Investigating and preventing misuse or violations of our Terms of Service
• Sending email notifications (study reminders, important announcements)
• Displaying ads via Google AdSense (interest-based advertising)

4. Third-Party Service Providers

We share data with the following providers solely as required to deliver our service:

We do not sell your personal information to any third party.

5. Cookies and Tracking Technologies

We use cookies and similar technologies to maintain login sessions, save your language preferences, and enable ad personalization. You can disable cookies in your browser settings, though some features may not function correctly as a result.

Google AdSense may use cookies to serve interest-based ads. You can opt out via Google's Ad Settings page.

6. Data Storage and Security

Your data is stored in encrypted form on Supabase (PostgreSQL). We apply appropriate technical and organizational safeguards to prevent unauthorized access or data breaches. However, no method of transmission over the internet is 100% secure.

7. Your Rights

• Access and correction: You can review and update your profile information from the Settings page.
• Data deletion (right to be forgotten): You can permanently delete your account and all associated data from the Settings page.
• Ad opt-out: You can disable personalized ads via Google Ad Settings.

If you are located in the European Economic Area (EEA), you may also have additional rights under the General Data Protection Regulation (GDPR). Contact us to exercise these rights.

8. Children's Privacy

Our service is not directed to children under 13. We do not knowingly collect personal information from children under 13. If we become aware of such data, we will delete it promptly.

9. Changes to This Policy

We may update this policy from time to time. For significant changes, we will notify you by email or via an in-app notice. Continued use of the service after changes constitutes acceptance of the updated policy.

10. Contact Us

For questions or requests regarding this policy, please use the contact form in the Settings page or reach us at the email address listed on our Operator Information page.