Privacy Policy

Overview

ZRead is designed with your privacy in mind. We collect minimal data necessary to provide and improve our service.

Data Collection

We use Firebase Analytics to collect anonymous usage data, including:

• App usage patterns (feature usage, reading sessions)
• Device information (model, OS version)
• Crash reports via Firebase Crashlytics

This data is anonymous and cannot be used to identify you personally.

On-Device Processing

All AI features (text-to-speech with Kokoro, image enhancement) run entirely on your device. Your book content is never sent to external servers.

Books and Reading Data

Your books, reading progress, and settings are stored locally on your device. We do not have access to what you read.

Cloud Storage (Google Drive & Dropbox)

ZRead allows you to connect your Google Drive or Dropbox account to browse and download book files. When you connect a cloud storage account:

• Read-only access — ZRead only reads your files. We never upload, modify, or delete anything in your cloud storage.
• Direct connection — ZRead connects directly to Google Drive and Dropbox. Your files and credentials are never sent to our servers.
• Secure credential storage — OAuth tokens are stored in the iOS Keychain on your device. They never leave your device.
• No tracking — We do not track or log which files you browse or download from cloud storage.
• Disconnect anytime — You can disconnect your account at any time, which removes all stored credentials from your device.

OPDS Catalogs

ZRead supports browsing OPDS catalogs to discover and download books. When you use OPDS catalogs:

• ZRead connects directly to the catalog server you specify. We do not proxy or intercept these connections.
• Catalog URLs you add are stored locally on your device.
• We do not track which catalogs you browse or which books you download.

Subscriptions

Subscription purchases are processed through Apple's App Store. We use RevenueCat to manage subscription status. RevenueCat receives an anonymous identifier but not your personal information.

Third-Party Services

• Firebase Analytics & Crashlytics — anonymous usage and crash data
• RevenueCat — subscription management
• Google Drive — optional cloud storage integration (read-only access, OAuth 2.0)
• Dropbox — optional cloud storage integration (read-only access, OAuth 2.0)

Data Sharing

We do not sell, trade, or share your personal data with third parties.

Contact

If you have questions about this privacy policy, contact us at support@zread.app.

Last updated: March 31, 2026