# Privacy Policy for Substack Downloader – Video, Audio & Podcast MP4/MP3
**Last Updated:** February 8, 2026
## 1. Introduction
This Privacy Policy explains how **Substack Downloader – Video, Audio & Podcast MP4/MP3** ("we", "us", or "the extension") handles your data. We are committed to protecting your privacy. This extension is designed to run locally on your device and minimizes data collection to only what is necessary for functionality.
## 2. Data Collection and Usage
### Personal Data
**We generally do not collect personal data.** We do not track your browsing history or search queries. Your download activity remains local to your device unless you enable cloud sync features.
### Local Storage
The extension uses your browser's local storage API (`chrome.storage.local`) for:
- **User Preferences:** To save your settings (theme, file naming, quality).
- **Download History:** To store a local list of downloaded files. This stays on your device.
- **Usage Counters:** To track free tier usage limits locally.
## 3. Cloud Services & Third Parties
### Cloud Sync (Optional)
If you choose to enable **Cloud Sync**, the extension will interact with:
- **Google Drive API**: To upload files directly from your browser to your personal Google Drive.
- **Dropbox API**: To upload files directly from your browser to your personal Dropbox.
**Data Handling**: Files are transferred directly between your browser and the cloud provider. We do not proxy, store, or view your files on our servers. You revoke access at any time via your Google/Dropbox account settings.
### Pro Subscription Verification
To verify **Pro/Premium** status, the extension communicates with a backend database hosted on **Supabase**.
- **Data Transmitted**: A minimal, anonymous identifier or license key to validate your subscription status.
- **Purpose**: To unlock premium features like 1080p downloads and unlimited usage.
## 4. Permissions Breakdown
To function correctly, the extension requires specific permissions:
- **`downloads`**: Save files to your device.
- **`storage`**: Save settings locally.
- **`activeTab`**: Detect media on the current tab.
- **`identity`**: Authenticate with Google Drive (only if Cloud Sync is used).
- **`Host Permissions`**:
- `*://*.substack.com/*`: To detect media on Substack.
- `https://oztqexvwivgwakgavzoa.supabase.co/*`: To verify Pro licenses.
- `https://www.googleapis.com/*` & `https://content.dropboxapi.com/*`: To upload files to cloud storage (only if enabled).
## 5. Contact Us
If you have questions about this Privacy Policy, please contact the developer via the support link on the Chrome Web Store listing.