Privacy Policy for DuelCore
Effective Date: 09/05/2026
DuelCore is developed and operated by Deku3922 ("we", "our", or "us").
This Privacy Policy explains how we collect, use, and protect information when you use the DuelCore mobile application.
If you choose to sign in with Google, we collect basic account information such as:
This information is used only for authentication and cloud synchronization.
User preferences and app-related data (such as custom buttons, saved settings, and decks/cards) may be stored securely using Firebase Firestore to enable synchronization across devices.
Payments for DuelCore Pro are processed securely through Google Play. Subscription management is handled by RevenueCat.
We do not collect or store payment card information.
We may use Firebase Analytics and related services to collect anonymous usage data, crash reports, and performance information to improve the app experience.
DuelCore includes an AI-powered Judge feature.
Queries submitted through this feature may be processed by third-party AI service providers to generate rulings and responses. Please do not submit sensitive or personal information through the AI chat.
DuelCore may use the following third-party services:
Each provider may collect and process data according to their own privacy policies.
You may request deletion of your cloud-synced data and associated account information by contacting us at the email below.
We will process deletion requests within a reasonable timeframe.
If you are located in the European Economic Area (EEA), you may have the right to:
DuelCore is not intended for children under the age of 13, and we do not knowingly collect personal information from children.
We may update this Privacy Policy from time to time. Changes will be posted on this page with an updated effective date.
If you have any questions about this Privacy Policy, you may contact us at: