verified Chrome Web Store Compliant

Pustak — NCERT Offline Digital Library

Single-Purpose User Data Privacy Disclosures & Local Storage Architecture

Last Updated: August 27, 2026 • Chrome Manifest V3

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Zero Data Collection Guarantee

Pustak is built with a strict offline-first architecture. We do not track, collect, transmit, or sell your personal data. All highlights, bookmarks, reading positions, and downloaded textbooks remain 100% stored on your local computer.

block 1. Information We Do NOT Collect

Pustak operates without user accounts, logins, or telemetry trackers. We do not collect or process:

Personally Identifiable Information (PII): Full name, email address, physical address, or phone number.
Browsing & Activity Telemetry: Browsing history, visited websites, or search queries outside of Pustak's local textbook catalog.
Tracking Identifiers: Third-party tracking cookies, advertising IDs, or digital browser fingerprints.
Financial or Authentication Data: Credit card numbers, banking credentials, or passwords.

memory 2. Local Data Processing & Storage

Pustak processes only operational data strictly necessary to deliver textbook reading and chapter stitching functions:

Offline Textbook Files: Downloaded NCERT textbook PDFs are stored locally on your device (via browser IndexedDB and Origin Private File System (OPFS)) for instant offline reading.
Study Annotations: Highlights, page bookmarks, reading progress, and display settings (such as AMOLED Dark mode, font scaling, and two-page spread) are saved locally to preserve your study state.
Local Full-Text Search: Search queries are matched locally against pre-compiled SQLite textbook indexes; queries are never transmitted to any external server.

cloud_sync 3. Third-Party Endpoints & Network Requests

To access public educational textbooks and verify catalog revisions, the extension communicates strictly with the following endpoints:

NCERT Official Servers (ncert.nic.in): Fetches official, public NCERT textbook chapters, cover images, and curriculum documents.
Supabase Database (qsgdijvhaljrzelwziuy.supabase.co): Fetches updated textbook metadata and curriculum catalog lists.

These requests do not send any user profiles, personal identifiers, or study analytics to these remote servers.

delete_sweep 4. Data Retention & User Deletion Rights

Because all data resides exclusively in your browser's sandboxed storage, you have complete control over its retention:

Retention Duration: Data is retained in local storage until you choose to delete or clear it.
User Deletion: You can permanently wipe all downloaded books, bookmarks, highlights, and cached files at any time by clearing site data in your browser settings or removing the extension from chrome://extensions.

policy 5. Data Sharing, Sale & Limited Use Disclosures

In compliance with Google Chrome Web Store Developer Program Policies and Limited Use Requirements:

We do NOT sell, trade, or rent user data to third parties under any circumstances.
We do NOT transfer user data to advertising platforms, data brokers, or marketing networks.
We do NOT use or transfer user data to determine creditworthiness or for lending purposes.

security 6. Chrome Permissions Justification

The extension requests only the minimum required permissions necessary for its single purpose:

unlimitedStorage: Stores high-resolution textbook PDFs locally for offline study without browser quota evictions.
tabs & tabGroups: Opens textbook chapters into organized browser tab groups ("Pustak Pathshala").
offscreen: Runs background PDF decompression and SQLite search indexing without blocking the UI thread.
downloads: Enables students to save stitched multi-chapter PDF books to their local disk.
declarativeNetRequest: Attaches required referer headers to fetch official NCERT educational files without anti-hotlinking network blocks.

mail 7. Contact Information

If you have any questions or feedback regarding this Privacy Policy, please reach out to our team:

📩 Email: support@houseof2.studio