Legal

Privacy Policy

Last updated: March 2026

Mugi合同会社 ("Mugi", "we", "our", or "us") operates the Mugi app and the website at mugi-app.com. This Privacy Policy explains what information we collect, how we use it, and your rights regarding that information.

By using our app or website, you agree to the practices described in this policy.

1. Information We Collect

We collect the following types of information:

• Account information — When you create an account using email and password, we collect your email address and a securely hashed version of your password. When you sign in using Apple Sign-In or Google Sign-In, we receive a unique identifier and, if you choose to share it, your email address and name. We do not receive your Apple or Google password.
• Email addresses — If you join our early access list on the website, we collect the email address you provide in order to notify you when the app launches and maintain any necessary communication afterwards.
• Study progress and usage data — We collect data about your in-app activity, such as quiz results, review history, study streaks, and feature usage. This is used to power the app's personalized review system and improve your learning experience.

2. How We Use Your Information

• To create and manage your account
• To personalize your study experience and track your progress
• To send you updates about the app (waitlist notifications and important announcements)
• To improve the app based on usage patterns
• To respond to your support requests

We do not sell your personal information to third parties.

3. Data Storage and Security

Your data is stored securely. We take reasonable technical and organizational measures to protect your information from unauthorized access, loss, or misuse. However, no method of transmission over the internet is completely secure, and we cannot guarantee absolute security.

4. Third-Party Services

We use the following third-party services, which may process your data according to their own privacy policies:

• Apple Sign-In — apple.com/legal/privacy
• Google Sign-In — policies.google.com/privacy

5. Data Retention

We retain your personal information for as long as your account is active or as needed to provide our services. You may request deletion of your account and associated data at any time by contacting us.

6. Young Learners

Mugi is designed to be useful for learners of all ages, including students who are minors. We encourage parents and guardians to use the app together with younger children and to reach out to us at [email protected] with any questions about how we handle their child's data.

If you are a parent or guardian and have concerns about information your child has submitted, please contact us and we will promptly address it.

7. Your Rights

Depending on your location, you may have the right to:

• Access the personal information we hold about you
• Request correction of inaccurate information
• Request deletion of your personal information
• Withdraw consent at any time

To exercise any of these rights, please contact us via the email address below.

8. Changes to This Policy

We may update this Privacy Policy from time to time. When we do, we will update the "Last updated" date at the top of this page. We encourage you to review this policy periodically.

9. Contact

If you have any questions about this Privacy Policy, please contact us at:
contact@mugi-app.com