Last updated August 2, 2026. Depthline is a local-first weight-trend utility with optional, read-only Apple Health access and one optional non-consumable purchase.
Depthline has no account or server for your readings, does not run ads or tracking, and never writes to Apple Health. Health import is optional, manual logging remains available without it, and Plus is a one-time purchase rather than a subscription.
Depthline stores manual readings, imported Health readings, unit preferences, target settings, selected vessel style, a local verified Plus status, and other app state on your device. A derived trend snapshot may also be shared locally with Depthline widgets through Apple app-group storage.
Depthline can read your complete approved body-weight history from Apple Health only after you grant permission. Later refreshes synchronize approved additions and deletions. Health access is optional, read-only, and does not require Depthline Plus. Depthline never writes body-weight readings to Apple Health.
If you decline or cannot use Apple Health, manual logging remains available. App-entered readings stay in Depthline and are not saved to Apple Health.
Depthline does not require a Depthline account and does not send your weight readings, targets, or trend history to a developer-operated server.
Depthline is free to download. Depthline Plus is an optional one-time, non-consumable purchase processed by Apple. It unlocks longer Voyage ranges and three additional vessel styles. It is not a subscription and does not require a Depthline account.
Depthline uses StoreKit to load localized product information, complete or restore the purchase, and verify whether Plus is active. Depthline does not receive payment-card details. Purchase restoration is independent of local weight data.
Depthline can export readings as CSV. Export is initiated by you through the iOS share sheet, where you choose what happens to the file.
Depthline does not use ads, third-party analytics, cross-app tracking, or social sharing.
Depthline is not a medical device and does not provide medical advice, diagnosis, treatment, diet coaching, or calorie guidance.
If Depthline changes how it handles data, this page will be updated. For privacy or support questions, email hello@jeromymobley.com or visit the Depthline support page.