See the signal,
not the noise.
LeanSignal brings weight, waist, body-fat, lean-mass, skinfold, DEXA, and Apple Health measurements together to show when the evidence supports a real pattern — and when it does not.
Private on your iPhone. No account. No advertising. No tracking.
The question that matters
“Is this change real — or just noise?”
Body measurements bounce. Hydration, meals, time of day, technique, and the devices themselves all move the numbers — often by more than the change you are looking for.
LeanSignal separates repeatable patterns from ordinary measurement noise. Instead of celebrating every dip or worrying over every spike, you see whether the evidence actually supports a pattern, how strong that evidence is, and what a reasonable working range looks like.
Not a diet program. Not a workout tracker. An honest interpreter for your measurements.
How it works
Three steps to a clear read
Record or import
Log weight, circumference, body-fat, lean-mass, skinfold, or DEXA results — or let LeanSignal read them from Apple Health. Read-only, and always under your control.
Build your baseline
LeanSignal learns how much your measurements normally bounce around, building a personal baseline and noise model from your own history — not population averages alone.
Review the evidence
Each pattern gets a Signal Score and a working range, so you can see whether a change looks repeatable or is still within your ordinary measurement noise.
Core features
Everything your measurements deserve
Signal Score
A plain-language read on whether a change looks like a repeatable pattern or ordinary noise.
Personal baseline & noise model
Built from your own measurement history, so interpretation reflects how your numbers actually behave.
Every measurement in one place
Weight, circumference, body-fat, lean-mass, skinfold, and DEXA — combined where methods can support each other.
Apple Health import
Read-only access to the measurement categories you approve. LeanSignal never writes estimates back.
Weekly & monthly reviews
Trends, period comparisons, detections, forecasts, milestones, and retrospectives — on your schedule.
Progress photos
Same-pose comparison that stays private on your device, presented respectfully and without judgment.
PDF & CSV reports
Share a clear summary with a coach or keep your own records. Nothing leaves the app unless you export it.
Full local backup & restore
Your complete history in a backup file you control — no cloud account required.
Privacy lock
Protect the app with your device’s own authentication. NovoBuild never receives biometric information.
Privacy as product behavior
- No account and no sign-in — the app simply works.
- No advertising, no cross-app tracking, no behavioral analytics.
- No cloud synchronization: your measurements, interpretations, and photos stay on your iPhone.
- Apple Health access is read-only, limited to categories you approve, and revocable at any time.
- Exports and backups leave the app only when you choose to share or save them.
Methodology & uncertainty
Honest about what numbers can say
LeanSignal builds on published body-composition equations and measurement research, combines methods where they can genuinely support each other, and widens its working ranges when methods disagree.
DEXA results are treated as a calibration reference — valuable, but not perfect ground truth. Forecast ranges are practical uncertainty guides, not clinical confidence intervals.
A note on health
LeanSignal provides informational interpretations of consumer body measurements and normal variability. It is not medical advice and is not intended to diagnose, treat, cure, or prevent any disease or medical condition. It is designed for adults age 18 and older. Consult a qualified healthcare professional before making medical decisions and whenever you have concerns about your health.
Read the full Health & Safety StatementCommon questions
All support topicsIs LeanSignal a medical app?
No. LeanSignal provides informational interpretations of consumer body measurements. It is not medical advice and is not intended to diagnose, treat, cure, or prevent any disease or condition.
Why is my Signal Score still building?
The Signal Score depends on a personal baseline, which takes a series of measurements to establish. Early on, LeanSignal is honest about uncertainty rather than guessing.
Why do my body-fat estimates disagree?
Different methods measure different things with different error. LeanSignal expects disagreement — that is exactly what working ranges are for.
Where is my data stored?
On your iPhone. There is no LeanSignal account, no cloud synchronization, and no copy on NovoBuild servers.
Understand what your measurements are saying.
LeanSignal is coming soon to the App Store for iPhone. Private, honest, and built to earn its place on your device.
Designed for
LeanSignal — Resources