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Privacy Policy

Effective Date: October 31, 2025

Last Updated: October 31, 2025

Defyner (“we”, “our”, or “us”) develops mobile applications focused on productivity, habit tracking, and personal growth.

This Privacy Policy explains how we handle information when you use our apps, including Booktrail.

1. Information We Collect

We collect only the data necessary to provide a reliable experience and improve our products.

Personal Information

We do not collect personal details such as your name, email address, or contact information unless you contact us directly by email.

App Data

All your app data (for example, reading progress, notes, and preferences) is stored locally on your device. We do not have access to this data and do not store it on our servers.

Analytics & Crash Data

We use trusted third-party services to collect anonymous analytics and crash reports, including:

  • Mixpanel – to understand feature usage and improve user experience
  • Sentry – to track app errors and performance issues
  • Apple / Google Crash Reporting – to gather system-level crash data

These services may collect:

  • Device type and operating system version
  • App version and feature usage events
  • Error messages or stack traces (for debugging)
  • Event timestamps (e.g., session starts, actions taken)
  • General region or language settings (not precise location)

This information is aggregated and anonymized — it does not personally identify you and is used solely to improve app functionality, stability, and performance.

2. How We Use Information

  • Monitor app stability and diagnose bugs
  • Improve reliability, usability, and performance
  • Understand general usage patterns and preferences
  • Respond to support requests sent via email

We do not sell, rent, or share your information with advertisers or unrelated third parties.

3. Third-Party Services

We use the following third-party providers to support analytics and diagnostics:

These providers may use anonymized device identifiers and operate under strict data protection and GDPR-compliant practices.

4. Data Storage and Security

  • Your personal app data is stored only on your device.
  • Diagnostic and analytics data sent to third-party providers is anonymized and transmitted over encrypted (HTTPS) connections.
  • We take reasonable measures to protect any information you voluntarily share with us.

5. Your Rights

You remain in control of your information.

If you have questions or concerns about data usage, or wish to request deletion of any information you’ve shared via email, please contact us at support@defyner.com.

6. Changes to This Policy

We may update this Privacy Policy periodically to reflect changes in our apps or applicable regulations. The “Last Updated” date at the top indicates the current version.

7. Contact Us

If you have any questions or concerns about this Privacy Policy or how we handle data, please contact us:

Email: support@defyner.com
Website: www.defyner.com