Got Questions?
Frequently Asked Questions
Everything you need to know about how Lighter works, where your data lives, and our simple pricing.
No. Lighter is completely offline-first. There are no accounts, no logins, no cloud sync servers, and no advertisements. All your data lives securely in a local SQLite database on your Android phone. You can use Lighter indefinitely with zero network connectivity.
Yes! The free version is completely functional forever. It includes full weigh-in logging, trend charts, BMI analysis, daily reminders, biometric lock, Health Connect sync, and CSV/JSON export. No ads or artificial limits on your history.
The optional Lifetime unlock ($1.99 one-time) is for committed trackers who want to track more than just weight: body circumference measurements (waist, hips, chest, etc.), private on-device progress photos with side-by-side comparisons, body composition charts, monthly reports, and the home-screen glance widget.
The optional Lifetime unlock ($1.99 one-time) is for committed trackers who want to track more than just weight: body circumference measurements (waist, hips, chest, etc.), private on-device progress photos with side-by-side comparisons, body composition charts, monthly reports, and the home-screen glance widget.
Lighter communicates with Android's native Health Connect service on your phone. When connected, it can automatically read new weigh-ins recorded by your smart scale (Withings, Garmin, Fitbit, etc.) and write weigh-ins you log in Lighter so other apps can see them. All communication occurs locally on your phone without touching third-party servers.
Daily body weight naturally bounces around from water retention, sodium, and digestion. Lighter uses a least-squares linear regression over your recent weigh-ins (spanning at least 7 days within a 28-day window) to calculate your weekly rate of change. This gives you an honest, reliable projection of when you will reach your goal weight.
In Lighter, open Settings → Backup & Data → Create a backup file. Lighter generates a compact, human-readable
.json backup containing all your weigh-ins, profiles, and settings. Save or share it to your Google Drive or email. On your new phone, install Lighter and choose "Restore from a file".
Never. The purchase is linked directly to your Google account via Google Play. If you change phones or reinstall, tap Restore Purchases in Settings, and your Lifetime unlock will be restored instantly.
Yes. Open Settings → Backup & Data → Export to CSV. Lighter generates a clean, comma-separated spreadsheet with your weigh-in dates, weights, BMI values, body-fat percentages, and notes ready to open in Excel, Numbers, or Google Sheets.