Privacy Policy for EngiCards – STEM Flashcards

Last Updated: April 18, 2025

Introduction

Welcome to EngiCards. This Privacy Policy outlines how we collect, use, and protect your information while using our app. We are committed to safeguarding your data and ensuring transparency about how your information is handled.

Authentication and User Identity via Firebase

EngiCards uses Firebase Authentication to allow users to securely sign in and access personalized features.

What We Collect via Firebase:

• Username
• Email address

This data is used solely for app functionality, such as:

• Allowing you to log in securely
• Storing and syncing your content across devices
• Enabling sharing features and user-linked content uploads

We do not use your name or email for advertising purposes, and this data is never shared with third parties for marketing.

Subscription & Purchase Management via RevenueCat

EngiCards uses RevenueCat to provide subscriptions, ensuring a seamless and secure experience.

What RevenueCat Collects on Our Behalf:

• A randomly generated anonymous user ID
• Transaction details (e.g., purchase date, product ID, subscription status, renewal info)

This data is used to:

• Enable and manage premium features
• Prevent fraud through receipt validation
• Generate aggregated analytics to help us improve the app

Importantly, RevenueCat does not receive your Firebase username or email. The RevenueCat user ID is anonymous and not linked to your personal identity.

For more information, see RevenueCat's Privacy Policy.

How We Use Your Data

• Firebase: For authentication, syncing content, sharing features, and storing your progress and uploads.
• RevenueCat: For managing subscriptions, enabling entitlements, validating purchases, and analyzing aggregated subscription behavior.

Your Choices

• You can use EngiCards' core features without a subscription.
• Your username and email are stored only if you choose to sign in.
• Subscription data is handled anonymously through RevenueCat.

Data Retention

We retain authentication and purchase data as long as it's needed to provide app functionality or meet legal obligations. Since RevenueCat uses anonymous identifiers, we cannot delete individual purchase records. Firebase-stored identity data (e.g. email/username) can be deleted upon request.

Changes to This Privacy Policy

We may update this Privacy Policy periodically. Any changes will be reflected here, and the "Last Updated" date will be revised accordingly.

Contact Us

If you have any questions about this Privacy Policy, please contact us at:

zouhairfakhoury@icloud.com

By using EngiCards, you agree to the collection and use of information as described above.