Privacy Policy

1 Information We Collect

We collect the following information only as needed to provide the App.

• • Email address: collected when you sign in with Apple ID or Google. Used for account identification and authentication.
• • User ID: a unique identifier issued by Firebase Authentication. Used to associate your learning data with your account.
• • Purchase history: to manage your subscription, RevenueCat processes information such as purchase status and expiration. Payment details such as credit card numbers are processed by Apple App Store, and we do not receive them directly.
• • Product activity (learning data): answers, correctness, learning progress, review list, completion timestamps, etc. — data needed to provide the App and support continued learning.
• • Voice data: only when you use the pronunciation practice feature, your recorded audio is sent to Microsoft's speech analysis service. It is not stored on our servers. Voice input for answers is processed on-device and not sent externally.
• • Inquiry content: the content you optionally submit via the contact form, plus your reply email address.

* We do not collect names, addresses, phone numbers, dates of birth, or advertising identifiers such as IDFA. We do not perform tracking.

2 Purpose of Use

We use collected information only for the following purposes.

• •Providing the App's features and managing learning progress
• •Providing learning support features such as AI feedback and pronunciation feedback
• •Managing subscriptions and verifying validity
• •Responding to user support inquiries and sending notifications
• •Ensuring service security and preventing abuse
• •Maintaining and improving the service, and announcing new features

3 Third-Party Services (Processors)

The App uses the following third-party services to deliver its features. Please also review each service's privacy policy.

• •Google (Firebase): authentication, database (Firestore), audio file delivery (Cloud Storage)
• •RevenueCat: subscription state management
• •Apple: speech recognition (when answering, on-device), Sign in with Apple
• •Microsoft: speech analysis (when using the pronunciation practice feature)
• •External AI services: AI feedback and pronunciation feedback generation

4 International Transfers

Some of the third-party services above operate on servers in the United States and other countries, and your information may be transferred there. We confirm the data protection level at the destination and apply appropriate safeguards before such transfers. By using the App, you are deemed to consent to these transfers.

5 Security Measures

We implement appropriate organizational, personnel, and technical measures to prevent leakage, loss, or damage of personal information. Learning data and account information are transmitted over encrypted communications (HTTPS) and stored securely in the cloud.

6 Disclosure to Third Parties

We do not provide personal information to third parties without your prior consent, except as permitted by law or in the case of the processors described above. We never sell personal information.

7 User Rights & Account Deletion

You have the following rights:

• •Request disclosure, correction, deletion, or suspension of use of your personal information
• •Immediately delete your account and related data via "My Page → Delete Account" in the App
• •Opt out of notifications and data collection

For requests that cannot be handled in-app, please contact us at the address in the last section after identity verification.

8 Children's Privacy

The App is not intended for children under 13. If a user under 13 wishes to use it, please do so under the consent and supervision of a guardian. If we discover that we have unintentionally collected personal information from a child under 13, we will delete it promptly.

9 Policy Changes

We may update this policy as needed. For significant changes, we will notify users through in-app notices or on the website.

10 Contact

For inquiries about the handling of personal information, please contact: