Privacy Policy

Last updated: June 9, 2025

MTG Compendium (“the app”) uses your device’s camera and other features to help you analyze and manage your Magic: The Gathering (MTG) cards and decks. This policy explains what information is collected, how it is used, and your choices.

Information We Collect

Camera and Media Access: The app accesses your camera to scan and analyze MTG cards and decks. All photos and videos are processed only on your device and are never uploaded or stored on our servers.

Deck Evaluations and Chat Data: When you use deck evaluation or chat features, the contents (card data, messages) are stored on our servers using a randomly generated identifier. No personally identifiable information (PII) is linked or stored.

Analytics: The app uses Firebase Analytics for basic usage and event data (e.g., screen views, feature use) to help us improve the app. No advertising features or demographic/ad personalization are enabled.

Crash Reporting: Sentry is used for crash and error reporting. Crash reports may include device information, logs, app version, and IP address. These are used solely for debugging and improving app stability.

Purchase Information: In-app purchases and subscriptions are handled by RevenueCat. No purchase information or receipts are stored by MTG Compendium. All purchase management follows standard app store and RevenueCat privacy and security practices.

How We Use Your Information

Card/Deck Analysis: All media and card scans are processed locally; nothing is uploaded or stored.

Deck/Chat Storage: Evaluations and chat messages are stored anonymously (not linked to your identity) and used only to provide features and improve AI quality (via Langfuse).

Analytics: Used only to understand app usage and improve user experience.

Crash Data: Used only for diagnosing and fixing bugs.

Data Sharing

Third-Party Services:

• Firebase Analytics and Sentry receive limited app data for analytics and crash reporting.
• RevenueCat is used for in-app purchase processing.
• Langfuse may store AI interactions and evaluation results, but always in an anonymous form.

No Sale of Data: Your data is never sold or shared for marketing.

Data Retention

Deck Evaluations and Chat: Stored anonymously for as long as needed to support app features and improve the AI.

Crash and Analytics Data: Retained as per the policies of Firebase, Sentry, and RevenueCat.

No Personal Media Stored: Photos and videos are never stored or uploaded.

Children’s Privacy

MTG Compendium is not specifically intended for children under 13. Users must be of the minimum age required to play Magic: The Gathering in their jurisdiction.

Your Choices

No Personal Data Stored: Since no PII or media is stored, there is no data to delete or manage.