Depthline

Follow your true weight trend, not the noise around it.

Daily scale readings move with water, timing, sleep, food, and ordinary fluctuation. Depthline keeps the smoother direction visible without turning weight tracking into a sprawling health dashboard.

Status: Available on the App Store
Availability: iPhone · Free core app · Optional one-time Plus upgrade
Privacy: Local-first · Optional read-only Apple Health import

View on the App Store Support Privacy Contact

Depthline Trend screen showing a smoothed weight trend, drift, and target context

The app, as it is.

Real screens from the current iPhone build, staged with deterministic sample readings and no personal Health data.

Depthline Trend screen with a smoothed weight line, current trend, drift, and target context. — See the calmer trend under daily readings.

Depthline Voyage screen showing recent progress as a 30-day submarine route. — Follow recent progress as a 30-day voyage.

Depthline quick entry screen for logging a manual weight reading. — Log a reading in seconds.

Depthline Logbook showing weight readings grouped over time. — Review each reading in context.

What Depthline does

The weight trend stays central. Body-composition or broader health scoring does not take over the app.

Smooth daily scale readings into a more useful weight trend.
Log readings manually without connecting Apple Health.
Import your approved body-weight history from Apple Health when you allow it.
Keep sparse-data states honest while the trend is still forming.
Review every reading in the Logbook and export your records as CSV.
Follow the included 30-day Voyage, with optional longer ranges and vessel styles through Depthline Plus.

Who it is for

Depthline is for people who already weigh themselves but find a single morning number too noisy to be useful. It provides calmer context without adding calorie tracking, diet rules, or a generic health score.

It is a personal trend utility, not a medical device, diagnostic tool, coach, or promise of a particular outcome.

Privacy

Your readings stay under your control.

Depthline stores manual readings and app settings locally. If you grant permission, it can read body-weight readings from Apple Health. Access is optional and read-only; Depthline does not write readings to Health.

There is no Depthline account or server for your weight readings. CSV export is initiated by you through the iOS share sheet.

Honest boundary

No accountNo adsNo Health writesNo diet plansNo coachingNo medical claimsOne optional purchaseNo subscription

Depthline's core tracking tools stay free: approved Apple Health history, manual logging, every Logbook record, the 30-day Trend and Voyage, CSV export, widgets, shortcuts, settings, and data controls. Depthline Plus is one optional purchase for longer Voyage ranges and three additional vessel styles. There is no subscription.

Read the privacy policy