Privacy Policy

Last updated: February 04, 2026

LingDay ("we", "our", or "us") operates the LingDay mobile application. This page informs you of our policies regarding the collection, use, and disclosure of personal data when you use our Service.

1. Information Collection and Use

We collect your email address solely for authentication purposes via Google Sign-In. This allows you to sync your vocabulary progress and premium status across different devices.

2. Payments and Billing

Our app uses the Google Play Billing Library for in-app purchases. We do not process or store your financial details (credit card numbers). All payment processing is handled securely by Google Play Services.

3. Third-Party Services

We use third-party services that may collect information used to identify you:

• Google Play Services
• Google Analytics for Firebase

4. Data Retention and Deletion

We retain your email as long as your account is active. You have the right to request the deletion of your data at any time. To do so, please contact us at the email address provided below.

5. Security

We value your trust in providing us your Personal Information, thus we are striving to use commercially acceptable means of protecting it. But remember that no method of transmission over the internet is 100% secure.