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Privacy Policy

Last updated: 2026-02-22

Mulvolin ("the Service") takes the protection of your personal information seriously. This Privacy Policy explains what information we collect, how we use it, and your rights regarding your data.

1. Information We Collect

We may collect the following types of information:

Account Information
Email address, display name, password (stored encrypted)
Profile Information
Avatar image, bio
Learning Data
Registered words, example sentences, review history, study statistics
Usage Information
Access logs, device information, IP address
Onboarding Data
Age range, gender, learning purpose, native language, target languages (provided optionally)

2. How We Use Your Information

We use the collected information for the following purposes:

  • Providing, operating, and maintaining the Service
  • Managing and authenticating user accounts
  • Providing AI translation features (input text is sent to AI service providers)
  • Optimizing learning through spaced repetition algorithms
  • Improving the Service and developing new features
  • Providing user support
  • Addressing violations of the Terms of Service

3. Sharing with Third Parties

We do not share your personal information with third parties except in the following cases:

  • With your consent
  • When required by law
  • When necessary to protect life, body, or property

Please note that when using the AI translation feature, the text you input is sent to AI service providers (such as Anthropic). Please ensure that personal information is not included in your input.

4. Data Storage

Your data is stored on servers with appropriate security measures in place.

Passwords are stored encrypted (bcrypt hash), and no one, including us, can view the original password.

You can download your learning data at any time using the data export feature.

5. Your Rights

You have the following rights:

  • The right to request disclosure of your personal information
  • The right to request correction or deletion of your personal information
  • The right to export your data
  • The right to request deletion of your account

To exercise these rights, please contact us through the settings page in the app or our contact form.

6. Use of Cookies

The Service uses cookies to maintain authentication status and provide the Service.

You can disable cookies through your browser settings, but some features of the Service may not be available if cookies are disabled.

7. Changes to This Policy

We may update this Privacy Policy as needed. If significant changes are made, we will notify you through the Service. The revised policy shall take effect from the time it is posted on the Service.

8. Contact Us

For inquiries regarding the handling of personal information, please contact us through the in-app contact feature.

Mulvolin