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Privacy Policy

Last updated: May 2026

Minna YES! ("the app", "we", "us") is committed to protecting your privacy. This policy explains what data we collect, how we use it, and your rights regarding your information.

1. What We Collect

When you create an account, we collect:

• Your email address — used for account creation and recovery only
• A password (stored securely, never in plain text)

When you use the app, we collect:

• Your exercise scores and session results
• Your lesson progress and validation status
• Your furigana preference and study settings
• Anonymous usage events (grammar viewed, vocabulary accessed) to improve adaptive hints

2. What We Do Not Collect

• Your name, age, or location
• Payment information — handled entirely by Google Play or Apple (we never see your card details)
• Any data from your device beyond what is listed above

3. How We Use Your Data

• To save and sync your progress across devices
• To personalize the adaptive hint system based on your study history
• To improve the app's content and features

We do not sell your data to third parties. We do not use your data for advertising.

4. Data Storage

Your data is stored securely using Supabase, a trusted backend infrastructure provider. Supabase's privacy policy is available at supabase.com/privacy.

5. Local Storage

The app stores study preferences and cached lesson data locally on your device to improve performance. This data never leaves your device and is deleted when you uninstall the app.

6. Guest Users

You can use parts of the app without creating an account. As a guest, no personal data is collected or stored — only anonymous, non-identifiable usage data.

7. Data Retention

Your data is retained as long as your account is active. You can request deletion of your account and all associated data at any time by contacting us at the address below.

8. Your Rights

Under GDPR and applicable privacy laws, you have the right to:

• Access the data we hold about you
• Request correction of inaccurate data
• Request deletion of your data
• Object to processing of your data

To exercise any of these rights, contact us at the address below.

9. Changes to This Policy

We may update this policy from time to time. We will notify registered users of significant changes by email. Continued use of the app after changes constitutes acceptance of the updated policy.

Support

We're here to help.

Minna YES! is built by an independent developer passionate about Japanese learning. If you have questions, encounter a bug, or want to give feedback, I'd love to hear from you.

Frequently Asked Questions

Is the app free?

The core features — grammar explanations and vocabulary — are free. Exercise practice and exam mode require a registered account. Some advanced features may require a subscription in the future.

Which textbook does the app follow?

Minna YES! is designed as a companion for Minna no Nihongo Book I. It covers all 25 lessons and is not affiliated with the textbook's publisher.

How do I delete my account?

You can delete your account from the app settings. Alternatively, contact us at the email below with the subject "Account deletion request" and your account and all associated data will be deleted within 7 business days.

I found an error in a grammar explanation or exercise.

Please report it — content accuracy is critical to us. Send us the lesson number, the error, and what you believe is correct. We review all reports.