Phaze vs. Bild Health:
the marketing and the build

Every Phaze row below comes from one of two places, and the distinction is the whole page: observed means we saw it in the running app on 24 August 2026; site claimsmeans it appears in Phaze’s marketing and did not surface in the walk-through. A claim is not a feature until it ships where a user can find it.

What the install actually showed

Onboarding is calorie-first from the opening screens. Height is collected “to calculate your daily calorie target.” The goal options are feeling better, losing weight, building habits and maintaining results. The plan the app then generates targets calories, hydration and movement. Protein exists as a nutrition metric with a goal, but the plan the app builds around you does not lead with it. The paywall, the surface where a product says what it thinks it is worth, sells the AI meal camera, four-week charts and a doctor PDF. Nothing about measurement.

Two observations worth knowing beyond features. The medication picker offers fourteen options, and several are investigational compounds listed beside the approved drugs without labeling, a compliance posture we would not mirror. And the onboarding asks for cross-app ad tracking in the same flow that promises health data is never shared; both can be true, but they sit oddly together.

The paywall, read as a statement of intent

A paywall is the most honest document an app publishes: it is the list of things the maker believes people will pay for. Phaze’s offered Premium at $4.99 a month, or $2.91 a month billed yearly under a “save 42%” badge. It sold three things: the AI meal camera (“point your camera at any meal”), four-week charts (“trends you can’t see day-to-day”), and a doctor-visit PDF. That is a well-made calorie product monetizing exactly what calorie products monetize. What it is not, anywhere on the screen where the company states its own value, is a body-composition product. If the measurement features its website leads with were shipped and loved, they would be here.

The structure of the app says the same thing. Five tabs (Home, Progress, Nutrition, Activity, Medication), with Progress charting weight only in the tier we walked: an average, a monthly delta and a zone band. It is a clean weight chart. It is also precisely the chart the whole category already ships, and the one a fat-versus-lean question cannot be answered from.

Trying Phaze honestly

If this page reads like a warning, it is a narrow one. Phaze cost us nothing to try and the free tier is real. The dose log and Estimated Levels chart is live from the first dose you log, meal capture is fast and pleasant, and the first-week checklist is the most invested onboarding we have walked. The honest trial is to install it, log a day, and then ask it the only question this comparison turns on, the question the keep-the-muscle guide is built around: how much of the weight you have lost was fat? On the build we walked, there is no screen that answers. If a later release ships the measurement features the site describes, the question becomes where the number comes from. And a photo estimate with a conceded three-to-five-point margin competes with the scale it replaces, not with a scan.

Where the axis actually is

Suppose the site’s claims ship tomorrow. The axis would still hold, because Phaze’s marketed body composition is an AI photo estimate that concedes a three-to-five-point margin: the same error band as the impedance scales it would compete with. A photo guess is not a measurement. Bild Health’s lean-mass number comes off a body-composition scale and is anchored by DEXA scans, the reference method, imported from a connected BodySpec account. In pooled DEXA and MRI trials, a meaningful share of GLP-1 weight loss was lean mass rather than fat; whether that is happening to you is a question only a measurement answers.

Why a funded rival marketing measurement matters

Phaze is the first competitor in this category to put body composition and DEXA import at the front of its marketing. In its way, that is the strongest outside validation the measured approach has received. And the full thirteen-app comparison shows how rare shipping it still is. The category has spent two years competing on dose logging and food capture; a new, funded entrant chose to sell the measurement story instead. We think they are right about what matters and early about shipping it. Until the build catches the brochure, the difference between the two apps is simple: one describes the number you need, and one charts it.

What would change this page

Three things, and we are watching for each. A paid-tier walk that finds the body-composition and DEXA features shipped and working (the audit behind this page names that check as owed). A release whose notes put lean mass on a chart. Or the photo estimate arriving for real, in which case the comparison sharpens rather than closes: an estimate that concedes a three-to-five-point margin is an argument for the scale-and-scan approach, not against it. This page carries its check date for exactly that reason: comparisons rot, and one that will not say when it was last true is not worth your trust.