Privacy Policy

1. Introduction

Welcome to HSC Math Solution ("we", "our", or "app"), developed and published by Marjuk Amin. This Privacy Policy describes how we collect, use, and protect your personal information when you use our mobile application (Package: com.marjuk.hscmathssolver) and related web services.

We are dedicated to safeguarding student privacy and ensuring full transparency regarding data collection in compliance with Google Play Developer Policies and global data protection standards.

2. Information We Collect

We collect minimal information necessary to deliver educational content and manage user entitlements:

• Google Account Information (Optional Authentication): When you choose to sign in via Google OAuth, we receive your email address, display name, and profile picture URL. This is used solely to authenticate your identity, sync bookmarks, and associate your Lifetime PRO license with your account.
• Payment & Transaction Information: When you purchase the PRO membership via ZiniPay, we receive invoice transaction status (e.g. transaction ID, payment status, customer email, and payment sender number) to verify and activate your PRO status. We do not store or process your bank credentials, credit cards, or mobile banking PINs.
• Device & Diagnostics Data: Non-personally identifiable diagnostic information (such as app crashes and performance metrics) may be processed by Google Play Services to maintain app stability.

3. Offline Encrypted Storage

Math chapter PDF solutions downloaded for offline reading are encrypted directly on your device using industry-standard AES-256-GCM encryption. These files are stored strictly within the app's sandboxed private storage and are not accessible by other applications or transmitted to third-party servers.

4. Third-Party Services

Our app integrates with trusted third-party providers that adhere to strict privacy practices:

• Google Play Services: Used for core Android framework integration and essential app features.
• Google AdMob: Serves non-intrusive banner and rewarded video ads to free-tier users. AdMob may use pseudonymous device advertising IDs in accordance with Google's advertising policies. (Note: PRO users enjoy a 100% ad-free experience).
• Supabase (Auth & Database): Secure cloud infrastructure for managing user authentication and PRO entitlement records.
• ZiniPay Payment Gateway: Encrypted payment processor for local mobile wallet transactions (bKash, Nagad, Rocket).

5. Children's Privacy

HSC Math Solution is designed for High School (HSC) and College students. We do not knowingly collect personally identifiable information from children under the age of 13 without appropriate parental consent. If you believe your child has provided us with personal data, please contact us immediately so we can remove it.

6. User Rights & Data Deletion

You have full control over your personal data:

• You can use the app anonymously as a guest without creating an account.
• You can request complete deletion of your account, email address, and transaction records at any time.

7. Changes to This Policy

We may update this Privacy Policy from time to time to reflect improvements or regulatory requirements. Any modifications will be posted on this page with an updated revision date.

8. Contact Us

If you have any questions, feedback, or data privacy inquiries, please contact the developer: