The best apps to track GLP-1 progress
On a GLP-1, the scale drops quickly. These apps help you see what is changing underneath: fat, muscle and shape.
Short answer
To see whether GLP-1 weight loss is fat or muscle, ProgressLens gives an AI fat vs muscle signal from matched photos and waist, arm and shoulder measurements on iPhone and Android; or use a 3D scanner with lean mass estimates (MeThreeSixty, ZOZOFIT). Keep doses and side effects in your clinic’s app or a dedicated dose tracker.
Disclosure: we make ProgressLens. Details about other apps come from their own store listings and websites as of November 2026; prices and features change, so check the listing before you pay. We name each app’s weaknesses and our own.
Quick comparison
| App | Platforms | What it tracks | Price |
|---|---|---|---|
| ProgressLens | iPhone, Android | AI fat vs muscle signal from photos + waist, arms, shoulders | $39.99/year |
| MeThreeSixty | iPhone, Android | 3D scans, lean mass estimates, GLP-1 dose log | Subscription |
| ZOZOFIT | iPhone, some Android | 3D measurements, GLP-1 log and summaries | Free plan; Premium |
| Your clinic’s app or a dose tracker | Varies | Doses, side effects, appointments | Varies |
The apps
1. ProgressLens
- iPhone, iPad, Android
- AI Progress Report
- Free download, Pro in-app
- 11 languages
- No account
Best for: seeing whether you’re losing fat or muscle, privately, on any phone.
Weight on GLP-1 medication drops fast, and the question that follows is how much of it is fat. ProgressLens keeps matched weekly photos and your tape measurements, and its AI report includes a muscle-loss signal: if your arms and shoulders shrink as fast as your waist while weight drops quickly, it flags it. Tell it you’re on a GLP-1 and the report is tailored to that.
Good
- AI Analyze: body-fat range, what changed, fat vs muscle, cut or bulk verdict
- Reads photos and tape measurements together, so estimates stay consistent
- Same app and AI on iPhone and Android, in 11 languages
- No account; photos stay on your phone, analyzed photos aren’t stored or used for training
- Ghost overlay of your last photo, six measurements with charts
Watch out
- No calorie, workout or dose tracking
- No video timelapse export (use our free web tool)
- No Apple Health or Health Connect sync
- No app-specific passcode (use your phone’s lock)
- No dose or side-effect tracking
2. MeThreeSixty
- iPhone, Android
- Subscription
Best for: a 3D view plus dose logging.
Builds a 3D avatar from front and side photos with body fat and lean mass estimates, and logs GLP-1 doses.
Good
- Lean mass estimates
- Dose tracking
Watch out
- Scans can be strict about pose
3. ZOZOFIT
- iPhone, some Android
- Free plan + Premium
Best for: measurement-heavy tracking with scans.
A 3D body scanner with circumference measurements and a GLP-1 log with progress summaries.
Good
- 16 measurements
- GLP-1 features
Watch out
- Device compatibility limits on Android
Which should you pick?
- An AI fat vs muscle check, privately, any phone: ProgressLens.
- 3D scans and dose log: MeThreeSixty.
- 3D measurements: ZOZOFIT.
See also: Ozempic, Mounjaro, Zepbound: fat or muscle? · GLP-1 progress month by month · Mounjaro progress tracker · Semaglutide vs tirzepatide muscle loss
FAQ
Frequently asked questions
How do I know if I’m losing muscle on Ozempic or Mounjaro?
Compare two body fat readings taken the same way with the fat vs muscle loss calculator, or watch your arm and shoulder measurements: if they fall about as fast as your waist, you may be losing muscle. Ask your clinician.
What should I track on a GLP-1?
Weekly weight and waist, monthly arms, shoulders and thighs, and matched front and side photos. Doses and side effects belong in your medication tracker.
How much muscle do people lose on GLP-1 drugs?
In trial substudies with DXA scans, roughly 25–40% of weight lost was lean mass, which includes water and organs as well as muscle.
Sources
- App Store and Google Play listings for each app, accessed November 2026
- ProgressLens, What lifters ask about body fat, November 2026