The best GLP-1 tracker apps,
compared on what they measure.
Thirteen apps, checked against their own pages (and twice, the installed apps) through 24 August 2026. Five things decide whether you keep the muscle: the dose, the weight, the fat mass, the lean mass, and the protein and lifting that defend them. Bild Health keeps all five in one record, takes the lean number off your scale rather than your phone camera, and turns it into the day's targets.
Updated August 24, 2026
IN SUMMARY
What is the best GLP-1 tracker app? For the job the medication actually sets, losing fat without losing muscle, it is Bild Health. Fat and lean mass are measured from a body-composition scale through Apple Health, not estimated from a phone camera, and anchored by imported DEXA scans. The measurement then drives the plan: protein and water targets computed from your fat-free mass, lifting counted against the week, every dose in the same record, and two lines that show whether it is working while there is still time to act.
Narrower jobs have honest narrower picks. If recording the shot is the whole job, Shotsy runs the deepest medication model. If you want coaching or a prescriber in the loop, Noom and WeightWatchers are programs rather than trackers.
Thirteen GLP-1 companion apps, compared on exactly that split: what each one measures, and what it drives. Checked through 24 August 2026, twice by installing the app.
Which one to install, by what you actually want
- 01
All five in one app: Bild Health
One record for the dose, the weight, fat mass, lean mass, protein and lifting. Lean is measured from a scale through Apple Health, anchored by every imported DEXA scan, and drives the day's targets: protein and water sized to fat-free mass, lifting counted. iPhone, Android and Apple Watch; no free tier, no food database.
- 02
The medication itself: Shotsy
The deepest medication model in the category. Estimated levels from published clinical data for four molecules, titration planning, injection-site rotation, multiple medications at once, PDF export for a clinician, and Mac, Vision and Android builds.
- 03
The best free app: Noom
The GLP-1 Companion has cost nothing since June 2026 and carries dose and side-effect tracking, personalized protein targets, Muscle Defense strength workouts and camera body scans reporting fat mass and lean mass in pounds. The largest free feature set here, with published outcome data behind it.
- 04
Coaching, workshops and a prescriber: WeightWatchers
Forty years of program design, virtual and in-person workshops, 1:1 dietitians, a camera body scanner in the $12 tier, and at MED+ prescribing and clinical care from the same vendor.
- 05
Food-first, with GLP-1 features added: MeAgain, MyFitnessPal, Cronometer
MeAgain is the GLP-1-native pick here, with the fastest protein quick-add in the category. MyFitnessPal (20M+ items) and Cronometer (84+ verified nutrients) are food trackers first: excellent databases that added a dose log, not companions built around the medication.
- 06
How the week actually feels: Glapp
Six named phases of the injection cycle, with food noise, hunger, sleep and mood logged against where you are in it. Supply tracking with expiry dates, and the only web client here.
Thirteen apps, three checklists, one question
A GLP-1 tracker is asked to hold five things at once, and they only mean anything together. The dose, because titration keeps changing for months. The weight. The fat mass and the lean mass underneath it, because a weight-only scale cannot tell a pound of one from a pound of the other. That split needs a body-composition scale. And the protein and the lifting, which decide which of them leaves. On one timeline a stalled month is readable. Split across four apps, it is a guess.
This is a comparison of GLP-1 companion apps, so they sort by what each was built around: dedicated trackers, programs, and food apps that added GLP-1 features. Every cross below means the feature is absent from what that vendor publishes, not proof the app cannot do it. Where a vendor documents something but not how it works, the cell says so.
The dedicated GLP-1 trackers: dose tracking first
| Bild Health | Shotsy | Phaze | |
|---|---|---|---|
| Estimated medication level | Yes | Yesfour molecules | Yes14 med options |
| Titration planning and guidance | Nohistory, not guidance | Yes | Partialsite claims; not surfaced |
| Injection-site rotation | Yes | Yes | Yes |
| Food logging with photo, voice and barcode | No | No | Yespolished |
| Labs and bloodwork tracking | No | No | Partialsite claims; Pro |
| iPhone and Android apps | Yesat launch | Yes | Yes |
| Apple Watch app | Yesat launch | No | Yes |
| Charts lean mass as a line over time | Yes | Novalue stored, not charted | Nonot surfaced in the app |
| Body composition from a smart scale | Yes | No | Nosite claims a photo estimate |
| DEXA scans imported as checkpoints | Yes | No | Nosite claims Pro; not surfaced |
| Sets a protein target | Yes2.4 g/kg fat-free mass | Noimported, not targeted | Yesbasis not published |
Shotsy’s vendor rows were read 24 August 2026(version history through v3.3.8). A cross means the feature is absent from what the vendor publishes, not proof the app cannot do it. Two rows are first-hand checks of the running apps rather than vendor statements: Shotsy’s body-fat and lean-mass fields, added v3.2.0, were still not charted when we installed and looked (31 July; nothing body-composition-shaped has shipped since per its version history), and we installed Phaze on 24 August 2026. Its site markets body composition and DEXA import, and neither surfaced anywhere in the app we walked: not in onboarding, not on the paywall, not in the free tier. “Site claims” in its column means exactly that. These are the rows most likely to be overtaken by a release.
The programs
| Bild Health | Noom | WeightWatchers | |
|---|---|---|---|
| Free tier | No7-day trial, yearly | YesGLP-1 Companion | No2-week trial |
| Doses and side effects logged | Partialfree-text note per shot | Yes | Yes |
| Human coaching or registered dietitians | No | Yes | Yes |
| Strength-training content | No | YesMuscle Defense | Yeson demand |
| Prescribing in the same product | No | Yespriced separately | YesMED+ |
| iPhone and Android apps | Yesat launch | Yes | Yes |
| Body-composition scan | Yesscale | Yescamera | Partialcamera, percentages |
| Fat mass and lean mass in pounds | Yes | Yes | No |
| Measured from a scale rather than a camera | Yes | No | No |
| DEXA scans imported as checkpoints | Yes | No | No |
| Protein target sized to measured lean mass | Yes | Partialbasis not published | No1 g/kg starting weight |
Noom’s and WeightWatchers’ rows come from their own release, feature and pricing pages, read 31 July 2026. A cross means the feature is absent from what the vendor publishes, not proof the product cannot do it. Noom’s free GLP-1 Companion is the largest free feature set in this comparison. Neither vendor claims a medication-level estimate, so no row asks about one.
The food apps that added GLP-1 features
| Bild Health | Cronometer | MyFitnessPal | |
|---|---|---|---|
| Food database with barcode scanning | No | Yes1M+, verified | Yes20M+ items |
| 84+ nutrients per food entry | No | Yes | No |
| Free tier | No | Yes | Yes |
| iPhone and Android apps | Yesat launch | Yes | Yes |
| Logs a GLP-1 dose | Yes | Nocustom biometric | YesUS, English only |
| Estimated medication level | Yes | No | No |
| A lean-mass metric charted over time | Yes | Yesfat-free mass, in Trends | No |
| Body composition from a smart scale | Yes | YesWithings, Garmin | Partialsome partners, body fat % only |
| DEXA scans imported as checkpoints | Yes | No | No |
| Protein target sized to lean mass | Yes | PartialKeto Calculator only | No1.2–1.6 g/kg body weight |
| A measured lean-mass line, with the dose history beside it | Yes | No | No |
Cronometer’s and MyFitnessPal’s rows come from their own published pages, read 31 July 2026. A cross means the feature is absent from what the vendor publishes, not proof the app cannot do it. Both vendors’ support sites decline our fetcher, so the biometric list, the Keto Calculator detail and the web-only body-fat measurement come from the search index’s rendering of those vendor pages. Whether Cronometer derives fat mass and lean mass in pounds, or only stores what the scale sends, is not documented, so no row asks.
Read down the dose column and the category looks solved. Read across, and the split shows up. Cronometer is the only other app here that takes a lean-mass metric off a smart scale, and it has no GLP-1 features at all. Its own advice to people on a shot is to build a custom biometric and log doses by hand. MacroFactor has none either. Noom and WeightWatchers do track the medication, and read lean mass from a phone camera instead. The scale-measured number and the dose sit on opposite sides of that split everywhere except one row.
What they cost
| App | Free tier | Paid | Worth knowing |
|---|---|---|---|
| Bild Health | 7-day free trial on the yearly plan | $19.99/mo · $59.99/yr | The dose, the weight, fat and lean mass, protein and lifting in one record |
| Shotsy | The everyday loop is free, per the vendor | Shotsy+ paywalls one thing: the estimated medication-level chart | Yearly SKUs listed at $39.99 and $59.99 side by side: apparent price testing; the site defers to the listing |
| Phaze | Substantial: dose + levels chart, nutrition, water, Apple Health | Premium $4.99/mo or $2.91/mo billed yearly (≈$34.92) | Prices read off the in-app paywall, 24 Aug 2026; the site matches |
| MeAgain | Free to download | MeAgain Premium listed at $69.99, plus a ladder of other SKUs | meagain.com names Premium but publishes no price |
| Pep | Free to download | Premium SKUs listed from $9.99 to $39.99 | pepglp1.com describes optional premium features and no price |
| Glapp | Free tier, boundary not published | Glapp Max: $4.99/week, $9.99/month, $39.99/year | Introduced June 2026; write-ups calling Glapp free predate it |
| Noom | GLP-1 Companion: free | Noom Weight from $17.42/mo on the 12-month plan | Telehealth and medication plans are priced separately, from $39 |
| WeightWatchers | 2-week trial on all plans | CORE from $12/mo · CORE+ from $22/mo · MED+ $25 then $74/mo | The body scanner is in the $12 tier; GLP-1 program starts at CORE+ |
| MyFitnessPal | Free tier with food logging | Premium $79.99/yr · Premium+ $24.99/mo or $99.99/yr | Multiple SKUs exist, so the offer you see may differ |
| MacroFactor | 7-day free trial only | $11.99/mo · $47.99/6 mo · $71.99/yr | No free tier at all: this is a paid app |
| Cronometer | Basic: free, including biometrics and device sync | Gold $10.99/mo or $59.99/yr | Custom Biometrics and Custom Charts are Gold features |
| Lose It! | Basic: free calorie tracking | Premium SKUs $9.99–$79.99; Premium Lifetime $49.99–$59.99 | The lifetime option is the only one in this set |
| Cal AI | Free download, 3-day trial | SKUs from $2.99 to $29.99; no published price list | The listing states that scanning results require a subscription |
App Store subscription ladders are offer-dependent: several vendors list five or more SKUs for the same product and publish no headline price, so a range is the honest answer rather than a single number. Where a vendor publishes a price on its own site, that is the number shown.
The rest of the thirteen, briefly
Shotsy is the most feature-complete medication logbook in the category and the honest answer for anyone whose priority is the drug: an unusually wide list including Rybelsus, Saxenda, Victoza, Trulicity, retatrutide, the Foundayo pill and Wegovy HD 7.2 mg, on-device storage with iCloud sync, and a Maintenance Mode added in March 2026 for life after goal weight. The full Shotsy comparison covers what the stored-but-not-charted lean-mass field means in practice. Phaze is the newest funded entrant and a heavily invested first-run experience: polished meal logging by photo, voice and barcode, a substantial free tier, and an Estimated Levels chart across fourteen medication options. What we could not find is the measurement story its website leads with: we installed it, and body composition and DEXA import surfaced nowhere in the app; the full Phaze comparison covers the gap between the marketing and the build.
MeAgain is the one to beat on food capture inside a GLP-1 app: photo, voice, barcode, search and quick-add, with protein, fiber and water goals tuned for people eating less. Progress is scale weight, photos and a shareable Journey Card; a composition metric is not part of it. Pep got to oral GLP-1s first, in January 2026, and ships constantly: nine releases this year, with food logging on a real database rather than an AI estimate alone. Pep got there first if your medication is a pill . Glapp has the best subjective-experience model here and it is not close, and it deliberately does no macros at all; how Glapp and Bild Health differ is mostly whether you want to track how you feel or what you are made of.
Noom is the closest thing here to a complete program: a psychology curriculum, human coaching, published outcome data, and a free GLP-1 Companion whose 10-second phone video returns body fat percentage, fat mass in pounds, waist-to-hip ratio and lean mass in pounds. Our Noom comparison is the narrowest argument on this site, and says so. WeightWatchers brings what no app replicates: forty years of design, the largest peer-support network in weight management, dietitians, and prescribing at MED+. Its published protein target is 1 g per kg of starting body weight, which is the one place our disagreement is sharp. The fat-free-mass rule we use instead has a free calculator.
MyFitnessPalowns the food database and the largest device-integration surface in this set, and its GLP-1 Support means the old “you will need a second app for your shots” argument no longer applies: what carries over if you run both . MacroFactor is the best-engineered nutrition app here (an adaptive expenditure algorithm that updates macros weekly from your own data), with no GLP-1 features of any kind. Cronometeris the answer if nutrition-data accuracy is the priority, with a biometrics system broader than any GLP-1 app's; our difference with both is focus, not capability.
Lose It! and Cal AI round out the field: capable calorie loggers (Lose It! with the only lifetime price here, Cal AI with the fastest photo capture), and neither claims a GLP-1 feature or a composition metric.
Every factual claim above is sourced to the vendor describing itself: their website, their App Store listing, or their App Store version history, which is vendor-submitted copy. Third-party reviews were used only to know where to look. Trademarks belong to their owners and are used here only to name the products.
Why body composition is a column at all
Every app here can show you a weight trend. The reason the checklists ask about fat and lean is that a weight trend leaves the most important question open. And one of the category's biggest apps says so itself: MeAgain's own site tells readers muscle is measured in a clinic, not an app. We think your clinic's scan and your body-composition scale can land in the same record.
Pooled by medication, from 25.4% on tirzepatide up to 35.2% on semaglutide. A weight reading cannot separate that fraction out, which is why the fat-and-lean rows, not the dose rows, are what actually separate these apps.
The basis matters more than the number, which is why the protein rows above ask what each app divides by, not just what it prescribes. Ours divides by measured fat-free mass.
The five things, in one record
Three screens, one argument: the dose, the fat and lean mass, and the checkpoint that keeps the trend honest. Measured rather than estimated, and read on the same axis.
Fat mass and lean mass, held apart
Two lines in pounds, never averaged into a single weight. That separation is the whole reason to open the app: it turns a stalled scale into a readable result rather than a reason to panic.
- Both series in pounds, not percentages
- Readings sync in through Apple Health from a compatible scale
- A per-week rate beside the current value, so you read direction, not one morning
The dose, the protein and the lifting, in one week
A week opens with the estimated medication level and reads down through protein, water and lifting: the inputs that decide what the next body-composition reading looks like. The medication is not a separate log you visit; it is the axis everything else is read against.
- Estimated medication level, protein, water and lifting on one card
- Dose history in the same record as the measured composition
- A note on every shot, so reactions sit next to the dose that produced them
A DEXA scan as the checkpoint, imported for you
Impedance readings drift with hydration and time of day. Connect a BodySpec account and every scan lands on the daily trend as a fixed checkpoint on the same line: the anchor that keeps a scale's impedance estimate honest over a year of loss, with nothing to re-type.
- Scans imported from a connected BodySpec account
- Scan values plotted on the same axis as daily readings
- Scan markers land on the estimate's own chart, so drift is there to see
- Every scan kept, so the checkpoints form their own series
Checked August 24, 2026. Every claim about each app on this page comes from each app’s own published feature and pricing pages, read on that date. Products change; if something here has gone out of date, tell us and we’ll correct it.
Where these numbers come from
- 01
Effect of Incretin-Based and Nonpharmacologic Weight Loss on Body Composition
Annals of Internal Medicine · 2026 · Batsis JA, Gavras A, Gross DC, et al. Ann Intern Med. 2026;179(7):996–1013. doi:10.7326/ANNALS-25-00478
- 02
Once-Weekly Semaglutide in Adults with Overweight or Obesity
New England Journal of Medicine · 2021 · Wilding JPH, et al. STEP 1. N Engl J Med. 2021;384(11):989–1002
- 03
The FASEB Journal · 2013 · Pasiakos SM, et al. FASEB J. 2013;27(9):3837–3847
- 04
International Journal of Sport Nutrition and Exercise Metabolism · 2014 · Helms ER, et al. Int J Sport Nutr Exerc Metab. 2014;24(2):127–138
- 05
Preserving Healthy Muscle during Weight Loss
Advances in Nutrition · 2017 · Cava E, Yeat NC, Mittendorfer B. Adv Nutr. 2017;8(3):511–519
- 06
Sarcopenia: revised European consensus on definition and diagnosis
Age and Ageing · 2019 · Cruz-Jentoft AJ, et al. EWGSOP2. Age Ageing. 2019;48(1):16–31
- 07
Diabetes, Obesity and Metabolism · 2026 · Eisa N, Barood O. Diabetes Obes Metab. 2026;28(6):4818–4827. doi:10.1111/dom.70666
The best GLP-1 tracker apps, answered
What is the best GLP-1 tracker app?
For the whole picture in one app, Bild Health: dose, weight, fat mass, lean mass, protein and lifting in one record, the lean number measured from a scale through Apple Health, anchored to imported DEXA scans, and driving protein and water targets sized to your fat-free mass. Nothing else here pairs a scale-measured lean mass with the dose history beside it. If the medication alone is the priority, Shotsy has the deepest model; for coaching and curriculum, Noom's free GLP-1 Companion is the largest free feature set, with lean mass from a phone camera.
Is there a free GLP-1 tracker app?
Noom's GLP-1 Companion has been free since June 2026 and includes a medication tracker with side effects and reminders, personalized protein targets, muscle-preservation workouts and camera body scans. It is the strongest free tier here by a distance; Cronometer's free Basic tier has no GLP-1 features. The dedicated GLP-1 apps (Shotsy, Pep, MeAgain, Glapp, Phaze) are free to download with a paid tier on top. Phaze's free tier is substantial, and Shotsy's paywall covers exactly one thing: the medication-level chart. Glapp added paid Glapp Max in June 2026; write-ups calling it free predate that.
Which GLP-1 app tracks muscle loss?
The approaches differ in where the number comes from. Bild Health reads a body-composition scale through Apple Health, charts fat and lean mass in pounds, anchors the trend to imported DEXA scans, and puts dose, protein and lifting on the same timeline. Noom and WeightWatchers scan with the phone camera and claim no DEXA capability. Cronometer charts scale-fed fat-free and skeletal muscle mass, with no GLP-1 features alongside.
Which GLP-1 trackers estimate medication levels?
Shotsy, MeAgain, Pep, Glapp and Phaze all publish some form of estimated medication level. Shotsy's is the most thoroughly described: levels modelled on published clinical data for four molecules, injections and pills. Phaze's spans the widest picker, fourteen medication options. Noom, WeightWatchers and MyFitnessPal log doses and side effects but claim no medication-level estimation.
Do I need a separate app for food and for my shots?
Less than you used to. MyFitnessPal shipped GLP-1 Support in 2026: dose, schedule and side effects in the Diary alongside food. MeAgain, Pep and Phaze combine dose logging with food capture from the start. What none of them pairs with a GLP-1 record is a measured fat-versus-lean split. Cronometer charts scale-fed composition, but with no dose history beside it.
How much do GLP-1 tracker apps cost?
Bild Health is $19.99/mo · $59.99/yr, with a 7-day free trial on the yearly plan. The programs are the expensive end: WeightWatchers runs from $12/month for CORE to $25 for a first month and $74/month after that for MED+, which includes prescribing. Noom Weight is $17.42/month on the 12-month plan while its GLP-1 Companion costs nothing. The general food apps sit in the middle: MyFitnessPal Premium at $79.99/year, MacroFactor at $71.99/year, Cronometer Gold at $59.99/year. Phaze Premium is $4.99/month or about $34.92/year, read off its own paywall. The other indie GLP-1 apps mostly publish no price: free downloads with in-app subscriptions whose listed SKUs vary by offer. Shotsy lists $39.99 and $59.99 yearly SKUs side by side, which reads as live price testing.
Which app sets a protein target, and how does it get the number?
The basis matters more than the number. Bild Health sizes protein at 2.4 g per kg of measured fat-free mass, recalculated as it moves. MacroFactor also uses lean mass, estimated from a body-fat category you pick. WeightWatchers uses 1 g per kg of starting body weight, which never moves; MyFitnessPal's guidance is 1.2–1.6 g per kg of body weight.
What should a GLP-1 tracker actually track?
Five things, in one record. The dose and the date, because titration is the variable that keeps changing. Side effects against the dose that produced them. Protein and lifting, because they are the two levers with real evidence behind them. And composition rather than weight alone: a weight-only scale cannot tell a pound of fat from a pound of muscle, and 25–39% of the weight lost in the body-composition substudies of the large trials was lean mass.
Can I use two of these together?
Plenty of people do, and the sensible pairing is a food logger plus a body-composition tracker. Cronometer or MyFitnessPal will handle what you ate against a database no GLP-1 app can match; Bild Health handles what your body did with it. Bild Health reads your body-composition readings from Apple Health, so one compatible scale only has to be stepped on once for both sides of that picture.
How current is this comparison?
Vendor pages were read on 31 July 2026, with Shotsy, MeAgain and Phaze re-checked on 24 August 2026: the Phaze check by installing the running app, and Shotsy's lean-mass rows carrying their own 31 July install check. Three facts still stale in most write-ups elsewhere: Shotsy's paid tier covers only the medication-level chart; Glapp has had a paid tier since June 2026; and Phaze's marketed body-composition features were not findable in the installed app.
Put all five on one timeline.
Bild Health charts your GLP-1 dose, your weight, fat mass and lean mass, and the protein and lifting that defend them, with the lean-mass number measured from your own scale and anchored to every DEXA scan that imports from your BodySpec account.
Lose the fat. Keep the muscle.