1. Information Collection and Use

Depending on your configuration and features used, the Application collects the following information for operational performance, bug troubleshooting, and service delivery:

• 100% LOCAL-FIRST DOCUMENT PRIVACY GUARANTEE: Your uploaded study files, PDF textbooks, DOCX notes, captured images, and camera scans are processed and stored exclusively on your local device sandbox. Pro Coders operates ZERO cloud document storage servers and NEVER permanently archives, inspects, or sells your personal study materials.
• Advertising & Device Identifiers (Google Advertising ID / AD_ID): Used strictly by Google AdMob to deliver contextual, non-intrusive advertisements and detect fraud. Qz Loop never links advertising identifiers to personal user identities. Students can earn 7 days of 100% ad-free study through peer referrals or reset advertising IDs via Android OS settings.
• Anonymous Anti-Fraud Referral Key: An anonymous, one-way cryptographically hashed device identifier is utilized strictly to deliver the viral referral program (granting 7 days of ad-free experience per invited peer) and prevent duplicate referral fraud in Google Firebase Realtime Database. This hash cannot be reverse-engineered and is NEVER used to track you across external apps.
• Diagnostic & Performance Telemetry: Non-identifying crash telemetry, ANR diagnostics, and app performance metrics provided via Google Play Services and AdMob diagnostics to maintain 99.9% crash-free stability.

2. Third-Party Service Providers

The Application may integrate third-party services that collect information used to identify you or provide runtime infrastructure. Below are links to the privacy policies of the third-party service providers utilized:

3. Android Device Permissions

To provide core functionalities, the Application may request the following permissions on your Android device:

Google AdMob Monetization & Non-Intrusive Ad Experience Policy

Qz Loop is sustained by unobtrusive advertising powered by Google AdMob to keep all educational and spaced repetition tools 100% free. In strict adherence to Google Play Better Ads Policies and student focus guidelines: • ZERO Ads During Active Practice: Advertisements NEVER interrupt you while you are actively reading, formulating, answering, or reviewing quiz questions. • Natural Breakpoints Only: Interstitial ads only appear at natural transition boundaries (e.g., immediately after completing a study session or following a newly imported document conversion). • Strict Cooldown: A 3-to-5 minute minimum cooldown is enforced between interstitial ads so you are never overwhelmed. • 7-Day Ad-Free Referral Pass: Any student who refers a peer unlocks 7 days of 100% ad-free learning across the entire application.

On-Device OCR & Zero Cloud Upload Commitment

Qz Loop uses Google ML Kit On-Device Text Recognition to convert images and scanned documents into text. All optical recognition algorithms execute entirely on your phone's processor. Camera images, photo gallery selections, and scanned pages are NEVER sent over the internet to external AI servers or remote third parties.

AI Question Structuring & Answer Key Identification

When you upload study materials, Qz Loop extracts raw text locally and utilizes Google Gemini AI to parse questions, detect multiple-choice options, and match answer keys. Text snippets are processed ephemerally in transit and are never permanently stored, cataloged, or used to train public machine learning models.

Anonymous Referral Verification System

To support our free learning mission, Qz Loop offers an optional student referral program where sharing the app gives you 7 days of ad-free study. To prevent fraud, our system uses a one-way hashed device signature recorded in Google Firebase Realtime Database. This token contains zero personally identifiable data and cannot be linked to your identity or other apps.

4. Children's Privacy (COPPA & Play Families Policy)

Qz Loop is rated Everyone and is designed for students of all ages. Because the app does not collect personal identifiers, emails, names, or location data, it complies fully with the Children's Online Privacy Protection Act (COPPA) and Google Play Families Policies.

5. Data Security & Storage Standards

We value your trust in providing us your information, and we use commercially acceptable means of protecting it. Any communication between the application and external servers is encrypted in transit using industry-standard TLS (Transport Layer Security) 1.2 and 1.3 cryptography. Local application cache files are protected by Android Sandbox isolation.

6. Data Retention and Account / Data Deletion

In accordance with Google Play data safety policies, GDPR, and CCPA guidelines, you have the absolute right to request the deletion of any personal, account, or diagnostic data associated with your use of the Application.

7. Changes to This Privacy Policy

We may update our Privacy Policy periodically. We will notify you of any changes by posting the new Privacy Policy on this page and updating the "Effective Date" at the top. You are advised to review this page periodically for any modifications.

8. Contact Information

If you have any questions, suggestions, or concerns regarding this Privacy Policy, please contact our Data Protection Officer at: