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Transparency First

Privacy Policy

Last updated: November 2026

🛡️

The Short Version

Lighter is an offline-first app. Your health data stays on your device and we never see it, collect it, or transmit it to any server. There are no user accounts, no tracking SDKs, and no ads.

1. What We Collect

Nothing. Lighter has no accounts, no analytics SDKs, no advertising frameworks, and no backend servers. When you use the app, no personal identifiers or health metrics are sent over the internet to us or any third party.

2. Where Your Data Lives

Everything you enter — profiles, weigh-ins, body-fat readings, notes, settings, goals, and measurements — is stored strictly locally on your device in an app-private SQLite database and local preferences file. If you uninstall Lighter, Android completely removes this data.

3. Network Access & In-App Purchases

Lighter functions fully without any internet connection. The only network activity occurs through Google Play Billing when you choose to purchase or restore the optional Lifetime unlock. Google processes all payment details directly under the Google Privacy Policy; Lighter never receives or stores your credit card, billing address, or payment credentials.

4. Google Health Connect (Optional)

If you choose to enable Health Connect synchronization:

  • Lighter requests permission to read and write Weight and Body Fat.
  • It reads these metrics solely to import weigh-ins from your smart scales into your diary.
  • It writes metrics so weigh-ins you log in Lighter appear in your other health apps.
  • This exchange happens entirely on your phone via the Android operating system. Health Connect data is never uploaded to any remote server by Lighter, is never used for advertising, and is never sold.
  • You can revoke permission at any moment inside Lighter (Settings → Health Connect) or directly in Android Settings.

5. Progress Photos (Optional, Lifetime)

Photos you capture or import for comparison are saved strictly within Lighter's private local sandboxed directory on your phone. They are never uploaded, never backed up to third-party clouds by us, and are permanently deleted whenever you delete them, use "Delete all data", or uninstall the app.

6. Backups and Export

Lighter lets you create full JSON backups or export your diary to CSV spreadsheets. When generated, these files are passed directly to the standard Android system share sheet. You have 100% control over where you send or store your backup files (such as your personal Google Drive, email, or local folder).

7. Biometric Security & Notifications

  • Biometric Lock: Authentication is handled by Android's native BiometricPrompt API. Lighter never accesses or stores your fingerprints or facial recognition data.
  • Daily Reminders: Reminders use Android's local AlarmManager. No push notification servers or device tokens are used.

8. Medical Disclaimer

Lighter is a personal logging and trend-visualization tool, not a medical device. It does not provide medical advice, diagnosis, or treatment. Calculated values such as BMI, body-fat percentage, and maintenance calories are estimates based on published formulas and should not replace advice from a qualified healthcare provider.

9. Contact Us

If you have any questions about this privacy policy, please reach out via our Feedback page or email us at privacy@lighter.app.