Privacy Policy

LBM Watcher · Last updated: July 2026

1. What is LBM Watcher

LBM Watcher is a free, local-only Progressive Web App (PWA) for tracking body weight, body fat percentage, and lean body mass over time. It is developed and maintained independently by Feym Luna.

2. Data collection

LBM Watcher collects no personal data of any kind. Specifically:

• No name, email address, or account is required or collected.
• The app contains no code that sends weight, body composition or health data to a server.
• No usage analytics, crash reports, or telemetry are collected.
• No cookies are used.
• No advertising networks or third-party SDKs are embedded.

3. Local storage

All data you enter (weight measurements, body fat percentages, and app settings) is stored exclusively on this device, in the app's local storage (a standard browser feature called localStorage). Nothing leaves the device unless you export it yourself, and an export is a file you then control. The app also asks the system to treat this storage as persistent, so it is less likely to be cleared when space runs low.

You can delete all stored data at any time from within the app (Data → Delete all data) or by clearing the app's data through your device settings.

4. External connections

The app makes no automatic connections to external servers. The only external link present in the app is the optional support link:

• Buy Me a Coffee (buymeacoffee.com/feymluna): this page opens only when you explicitly tap the support link at the bottom of the screen. It is entirely voluntary and governed by Buy Me a Coffee's own privacy policy.

The JetBrains Mono font is bundled with the app and served from your own device. No request is made to Google Fonts or any other external font service. Beyond loading its own files, the app requests nothing from the network. The only links pointing outside it are the support page and the contact address, and both open only when you tap them.

5. Health disclaimer

LBM Watcher is provided for informational purposes only. It does not constitute medical advice, diagnosis, or treatment. The physiological calculations in this app are based on peer-reviewed research (Alpert, 2005; Kouri et al., 1995) but individual physiology varies significantly.

Do not rely solely on this app to make health or dietary decisions. Consult a qualified healthcare professional, registered dietitian, or sports medicine specialist before making significant changes to your diet, training, or caloric intake.

6. Children

This app is intended for users aged 18 and older. We do not knowingly collect any data from children under 13. Since no data is collected from anyone, there is nothing to collect from minors either.

7. Changes to this policy

If this privacy policy changes, the updated version will be published with a revised "Last updated" date. Since no data is collected, changes are unlikely to affect users materially.

8. Contact

For questions about this privacy policy, reach out by email: contact@feymluna.com

The developer goes by Feym Luna and responds in English and German.