Privacy Policy

1. Information We Collect

When you use OMR Grader, we collect the following types of information:

• Account Information: Your email address, name, and authentication method (email/password or Google Sign-In) when you create an account.
• Scan Data: We record scan counts and types (camera, gallery, batch) for enforcing daily limits and internal analytics. Answer sheet images are processed entirely on your device and are never uploaded to our servers.
• Subscription Information: Purchase tokens and subscription status from Google Play Billing for managing premium features.
• Device Information: Device model, Android version, and app version for troubleshooting and compatibility.
• Usage Analytics: Firebase Analytics collects anonymous usage data such as feature usage and screen views. This data does not personally identify you.
• Crash Reports: Firebase Crashlytics collects technical crash data to help us fix bugs and improve stability.

2. How We Use Your Information

We use the information we collect to:

• Provide, maintain, and improve the OMR Grader service
• Manage your account, authentication, and subscription status
• Enforce daily scan limits for free-tier users
• Improve app performance and fix bugs via crash analytics
• Understand feature usage to prioritize development
• Communicate important service updates

3. Image Processing — On-Device Only

OMR Grader processes answer sheet images entirely on your device using local image processing algorithms. Your scanned images are never transmitted to or stored on our servers.

Processed result data (scores, answers, grade breakdowns) is stored locally on your device. Only aggregate scan counts are synced to the server for limit enforcement.

4. Data Storage & Security

Your account data is transmitted over encrypted connections (HTTPS/TLS). Passwords are securely hashed on the server — we never store plaintext passwords.

Authentication tokens are stored locally using Android's EncryptedSharedPreferences (AES-256 encryption). Session tokens expire after 1 hour and refresh tokens after 30 days.

5. Third-Party Services

OMR Grader uses the following third-party services:

• Google Firebase (Analytics & Crashlytics) — Anonymous usage analytics and crash reporting. See Google's Privacy Policy.
• Google Play Billing — Processing premium subscription purchases. Subject to Google Play's Terms.
• Google Sign-In — Optional authentication via your Google account.

6. Data Retention

We retain your account data for as long as your account is active. If you delete your account, your personal data is anonymized — email is replaced and name is cleared. Anonymous scan statistics may be retained for aggregate analytics only.

Local data (scanned images, results, answer keys, templates) is stored only on your device and removed when you uninstall the app or clear app data.

7. Your Rights

You have the right to:

• Access your personal data through your in-app profile screen
• Update your name and account information at any time
• Delete your account and all associated data — see our Account Deletion page
• Opt out of analytics by disabling Firebase Analytics in your device settings

For users in the EEA, you additionally have the right to data portability and to lodge a complaint with your local data protection authority. For California users (CCPA), you have the right to know what data we collect, request its deletion, and opt out of its sale (we do not sell your data).

8. Children's Privacy

OMR Grader is designed for educators and is not directed at children under 13. We do not knowingly collect personal information from children under 13. If we learn that we have, we will delete it promptly.

9. International Data Transfers

Your information may be processed on servers located outside your country of residence. We ensure appropriate safeguards are in place to protect your data.

10. Changes to This Policy

We may update this privacy policy from time to time. We will notify you of material changes by posting the updated policy in the app and on this page, and updating the "Last updated" date.

11. Contact Us

If you have questions about this policy or your data: