The short version: Lull does not collect, transmit, or store any of your personal data on external servers. Everything stays on your device. The only third party that receives any data is Apple (for weather), and they receive only your approximate location.
Lull collects the following data, all of which is stored exclusively on your device:
| Data | Where it goes | Notes |
|---|---|---|
| Pain scores & body locations | On-device only | Never transmitted |
| Medication entries | On-device only | Never transmitted |
| Notes & voice transcriptions | On-device only | Never transmitted |
| Barometric pressure readings | On-device only | Read from iPhone sensor via CMAltimeter; never transmitted |
| Your name (optional) | On-device only | Used in exported reports only |
| Location (city-level) | Sent to Apple WeatherKit | Used to retrieve local weather conditions; Lull does not receive or store your location |
| Backup files | User-controlled export only | You choose where to save backups; Lull has no access to the destination |
Pain scores, body locations, medications, and notes are collected solely to provide the core tracking functionality of the app — logging your pain over time and correlating it with barometric pressure changes.
Your approximate location is sent to Apple WeatherKit solely to retrieve the current barometric pressure and weather forecast for your area.
Apple WeatherKit is the only third party that receives any data from Lull. When you use the app, your approximate location is sent to Apple's servers to retrieve weather data. This is governed by Apple's Privacy Policy. Lull does not receive, log, or store your location data.
Lull has no analytics, advertising networks, crash reporting services, or any other third-party SDKs. There is no Lull backend — no servers, no databases, no accounts.
To delete all data stored by Lull, delete the app from your device. Because all data is stored on-device using Apple's SwiftData framework, deleting the app permanently removes all records.
If you have exported backup files, those are under your control in your chosen location (Files app, iCloud, etc.) and must be deleted separately.
Lull is not directed at children under 13 years of age and does not knowingly collect information from children under 13.
Because Lull collects no data on external servers, there is no personal data held by Lull Health LLC to access, correct, or delete. All data is on your device and under your control.
If this privacy policy changes materially, we will update the effective date at the top of this page. Continued use of the app after changes constitutes acceptance of the updated policy.
Questions about this privacy policy? Contact us at support@lullhealth.com.
© 2026 Lull Health LLC. All rights reserved.
Lull is a personal tracking tool and is not intended to diagnose, treat, or provide medical advice.