This Privacy Policy explains how Matheu (“we”, “our”, or “us”) collects, uses, and protects information when you use the NeoCards mobile application.
1Information We Collect
a. Account & Identity
- Email address (for authentication)
- Firebase Auth user ID
- Linked sign-in providers (Email/Password, Google)
We use Firebase Authentication to secure your account and allow you to access your data across devices.
b. Profile & Preferences
- Language preferences (source/target)
- Daily goal minutes and onboarding inputs (e.g., acquisition source)
- Notification and email preferences, reminder time, timezone
- Tutorial completion, review prompt, and paywall display status
These settings personalize your learning experience and notification timing.
c. User Content
- Decks and flashcards (front/back text, images, learning status)
- AI context for cards (definitions, synonyms, examples)
- Review history and study progress (Spaced Repetition data)
- Usage stats such as daily study time and monthly image searches
This data is stored in Cloud Firestore to sync your progress across devices.
d. Device & Diagnostics
- Crash logs (via Firebase Crashlytics)
- Analytics events (feature usage and app performance)
- Push notification token (FCM) for reminders and alerts
e. Subscription & Purchase Information
- Transaction identifiers issued by Apple App Store / Google Play Store
- RevenueCat customer IDs and entitlement status
We do not store your credit card or financial information. Payments are processed by Apple or Google.
f. Communications
- Email address for transactional emails and optional marketing emails
- Email notification preferences and engagement status
2How We Use Information
- To provide and sync the service across devices (decks, cards, reviews, settings).
- To generate AI context via Cloud Functions and OpenAI (translations, synonyms, examples).
- To enable image search with caching and usage limits (Freepik API).
- To schedule reviews, track goals, and send reminders (notifications and emails).
- To verify subscriptions and show paywalls when limits are reached (RevenueCat).
- To improve reliability and prevent abuse (analytics, crash logs, rate limiting).
3Data Storage & Security
- User data is stored in Google Cloud Platform (Firebase) in the United States.
- Callable Cloud Functions process requests in us-central1 and europe-central2 regions.
- Data is encrypted in transit and at rest by Firebase/Google Cloud.
- Authentication is handled via secure tokens; we never see or store your password.
- Access to protected fields is restricted by Firestore security rules and server-only functions.
4Third-Party Services
Firebase (Auth, Firestore, Crashlytics)
Authentication, Database, & Diagnostics
https://policies.google.com/privacyWe use OpenAI's API for AI context. Data sent to the API is not used to train OpenAI's models.
5Data Deletion
You have full control over your data. You can permanently delete your account and all associated data directly within the app:
Profile Screen → Delete Account
This action is immediate and irreversible. It removes your user profile, decks, cards, review history, and usage stats from Firebase, and deletes your Firebase Auth account. If you opted in to emails, your contact is removed from Brevo.
For more details, visit our Data Deletion page.
Profile Screen → Delete Account
This action is immediate and irreversible. It removes your user profile, decks, cards, review history, and usage stats from Firebase, and deletes your Firebase Auth account. If you opted in to emails, your contact is removed from Brevo.
For more details, visit our Data Deletion page.
6Children’s Privacy
NeoCards is not directed to children under 13. If we become aware that we have collected personal data from a child under 13 without parental consent, we will delete that information.
7Contact
Questions about your privacy? Email support@matheu.app