Last updated: May 11, 2026
Monster Compendium collects limited, anonymous usage data to improve the app experience. No personally identifiable information (name, email, location, etc.) is collected or stored.
Usage events are sent to Amplitude to understand how the app is used. Amplitude is used on Android, iOS, and desktop. These events include:
Events contain only app interaction data — no personal identifiers are attached.
Firebase Analytics is used on Android release builds to understand usage patterns. No personal data is included.
On Android and iOS, crash and error reports are automatically sent to Firebase Crashlytics. These reports include device model, OS version, and a stack trace. No personal data is included.
The free version of the app displays banner ads served by Google AdMob on Android and iOS. AdMob may use device advertising identifiers and usage data to serve personalized ads in accordance with Google's Privacy Policy. On iOS, a consent prompt is shown on first launch in accordance with Apple's App Tracking Transparency (ATT) framework.
Premium subscribers do not see ads.
Subscription purchases on Android (Google Play) and iOS (App Store) are processed through RevenueCat. RevenueCat receives purchase transaction data to validate and manage entitlements. See RevenueCat's Privacy Policy for details.
Data is shared only with the third-party service providers listed above (Amplitude, Firebase, Google AdMob, RevenueCat) for the purposes described. No data is sold to third parties.
If you have questions about this policy, open an issue at github.com/alexandregpereira/Monster-Compendium/issues or send an email to alexandregpereira.dev@gmail.com.