Privacy Policy

Last updated: February 28, 2026

Welcome to Mandarinly. We are committed to protecting your privacy and ensuring you have a positive experience while using our app. This Privacy Policy explains how we collect, use, and safeguard your information when you use our mobile application and website.

1. Information We Collect

We collect the following types of information to provide and improve our services:

• Account Information: If you create an account, we collect your name, email address, and profile picture (via Firebase Authentication and/or Google Sign-In).
• Learning Progress Data: Your quiz scores, completed challenges, vocabulary mastery levels, and learning streaks.
• Device Tokens for Push Notifications: We collect device installation tokens to securely send you learning reminders and app alerts (via Firebase Cloud Messaging).
• Advertising Identifiers: We collect non-permanent identifiers such as the Android Advertising ID (AAID) for ad personalization and frequency capping (via Google AdMob).
• Subscription and Purchase Data: Information about your subscription status and purchase history to manage premium features (via RevenueCat).
• App Usage Analytics: How you interact with different features, session duration, and feature usage patterns (via Firebase Analytics & Crashlytics).
• Device Information: Device type, operating system version, and app version for compatibility and issue tracking.
• Audio Preferences: Your preferred audio playback speed and volume settings.

2. How We Use Your Information

We use the collected information for the following purposes:

• Create and manage your user account securely across multiple devices.
• Personalize your learning experience and adapt difficulty levels.
• Track and safely store your progress, achievements, and statistics in the cloud.
• Send you relevant push notifications (such as streak reminders and timely updates) to help you stay motivated, provided you have opted in.
• Improve app features and monitor crashes based on anonymous usage patterns.
• Provide customer support and respond to your inquiries.

3. Data Storage and Security

Your data is stored securely using industry-standard encryption methods:

• Local Storage: Most of your learning preferences and caching data is stored locally on your device for fast access.
• Cloud Syncing: Your learning progress, phrase history, and account configuration are securely backed up using Google Cloud Firestore, allowing you to sync seamlessly across devices.
• Encryption: All data transmissions are encrypted in transit using SSL/TLS protocols and safely encrypted at rest.
• Data Retention: We retain your data as long as you maintain an active account.

4. Account and Data Deletion

You have the right to request the complete deletion of your account and all associated personal data (including learning progress, streaks, and identifiers) from our servers.

How to delete your account:

• Via Email: Send an email to mandarinly.support@protonmail.com with the subject line "Account Deletion Request" from the email address associated with your account. We will process your request and permanently delete all your data within 7-14 business days.

5. Third-Party Services

We may use the following third-party services to enhance app functionality:

• Firebase Authentication & Google Sign-In: For secure account creation, login handling, and identity management.
• Firebase Cloud Messaging (FCM): To securely deliver opt-in push notifications directly to your device.
• Firebase Cloud Firestore: Used as our primary database and cloud syncing engine.
• Google AdMob: For delivering personalized advertisements (requires user consent). AdMob may use your Advertising ID and approximate location for ad targeting.
• RevenueCat: For managing in-app purchases and subscriptions. RevenueCat processes transaction data to provide you with premium features.
• Firebase Analytics & Crashlytics: Used strictly for tracking broad app usage metrics and capturing crash logs to improve stability (anonymized data).
• Groq AI: Used to generate interactive phrases and learning materials. No personally identifiable data is sent to Groq; we only send vocabulary items to generate context.
• Google Cloud Text-to-Speech: For generating high-quality Mandarin audio pronunciations within the app.

These specialized services have their own stringent privacy and security policies managed by Google. We encourage you to review Google's privacy protocols for further information.

5. Your Rights and Choices

You have the following rights regarding your data:

• Access: Request a copy of your personal data
• Correction: Update or correct inaccurate information
• Deletion: Request deletion of your account and all associated data
• Export: Download your learning progress data in a portable format
• Opt-Out: Disable analytics tracking in app settings

6. Children's Privacy

Mandarinly is suitable for learners of all ages. We do not knowingly collect personal information from children under 13 without parental consent. If you believe we have collected such information, please contact us immediately.

7. Changes to This Policy

We may update this Privacy Policy from time to time. We will notify you of any significant changes through the app or via email. Your continued use of the app after changes are posted constitutes acceptance of the updated policy.

8. Contact Us

If you have any questions, concerns, or requests regarding this Privacy Policy or your data, please contact us:

• Email: mandarinly.support@protonmail.com
• Response Time: We aim to respond to all inquiries within 48 hours

9. Data Protection Compliance

We are committed to complying with applicable data protection laws, including GDPR (for EU users) and CCPA (for California residents). If you are located in these regions, you have additional rights as outlined in those regulations.