Best Apps to Track Your Macronutrient Breakdown
App guide
Ranked & compared
Tracking protein, carbs, and fat by gram is one of the highest-value habits on GLP-1 — appetite suppression makes it easy to eat far too little protein, which accelerates the muscle loss the drug itself risks.
Macronutrient tracking means logging daily grams of protein, carbohydrates, and fat — and optionally fiber, sugars, and saturated fat. For GLP-1 users, protein is the priority macro: the May 2025 joint Advisory from the American College of Lifestyle Medicine, American Society for Nutrition, Obesity Medicine Association, and The Obesity Society proposed targets of 1.2–1.6 g/kg/day during active weight reduction. Achieving that on a sharply suppressed appetite requires deliberate tracking, not guessing.
This is general nutrition and wellness information, not medical advice. If you're on a weight-loss medication or managing a health condition, confirm specifics with your clinician.
What you're actually tracking
Macronutrient tracking means logging daily grams of protein, carbohydrates, and fat — and optionally fiber, sugars, and saturated fat. For GLP-1 users, protein is the priority macro: the May 2025 joint Advisory from the American College of Lifestyle Medicine, American Society for Nutrition, Obesity Medicine Association, and The Obesity Society proposed targets of 1.2–1.6 g/kg/day during active weight reduction. Achieving that on a sharply suppressed appetite requires deliberate tracking, not guessing.
How we evaluated them
Apps included if they (a) display all three macros by gram in the standard interface, (b) allow custom macro targets at or below the paid tier reviewed, and (c) have verified pricing from App Store / Google Play / official sites (July 2026).
The apps, side by side
No single app wins for everyone — each card calls out who it's genuinely best for, so you can pick on fit, not hype.
MacroFactor
$11.99/mo / $47.99/6-mo / $71.99/yr (no free tier; 7-day trial)iOS / AndroidBest for: The most sophisticated adaptive macro coaching available in a consumer app
- Custom macro targets by gram; verified food database; fast logging
- Algorithm recalculates expenditure weekly from actual intake and weight
- No free tier; no recipe URL import
MyFitnessPal
Free / Premium $19.99/mo or $79.99/yr / Premium+ $24.99/mo or $99.99/yriOS / Android / WebBest for: Macro tracking with the largest food database
- 20.5M+ food database; custom macros by gram/percent (Premium tier)
- Meal scan and barcode scanner (Premium)
- Custom macro goals require Premium; barcode scanner now Premium-only; user-submitted entries vary in accuracy (37% of popular crowd-sourced entries had >20% energy errors in a 2024 peer-reviewed analysis)
Cronometer
Free / Gold $49.99/yr (about $8.99/mo)iOS / Android / WebBest for: Macros plus deep micronutrient tracking from lab-verified data
- Accurate macros and 80+ nutrients tracked from lab-verified USDA/NCCDB data on free tier
- Distinguishes sugar types; protein and amino-acid breakdown
- Slower logging than lighter apps; steeper learning curve
Yazio
Free / Pro $6.99/mo or $47.90/yriOS / AndroidBest for: Macros with fasting-window integration and a clean interface
- Clean macro dashboard; free barcode scanning; built-in fasting timer
- Full macro detail and custom targets require Pro
The Protein Priority: Why 1.2–1.6 g/kg/day Is the Number GLP-1 Users Need
On a GLP-1 medication, your appetite drops sharply — and with it, your protein intake can quietly crater. The May 2025 multi-society Advisory from the American College of Lifestyle Medicine, American Society for Nutrition, Obesity Medicine Association, and The Obesity Society proposed protein targets of 1.2–1.6 grams per kilogram of body weight per day during active weight reduction, precisely to blunt the lean-mass loss documented in the STEP 1 and SURMOUNT-1 trials.
For a 75 kg (165 lb) person, that means 90 to 120 grams of protein daily — a number that sounds manageable until you try to eat it on a stomach that signals fullness after half a chicken breast. A single 4-ounce chicken breast delivers about 35 grams of protein, meaning you would need the equivalent of roughly three of them across a day when your appetite might only accommodate one and a half.
This is where tracking becomes non-negotiable. Without logging, it is nearly impossible to sense whether you hit 70 grams or 110 grams — the difference between preserving muscle and losing it alongside fat. Apps that display protein in grams, not just as a percentage of calories, make that shortfall visible immediately.
Bottom line
Hitting 1.2 g/kg/day at reduced calories is hard — a 75 kg person needs ~90 g of protein per day from a food volume that feels much larger than their appetite allows. Tracking makes invisible shortfalls visible.
Carbs and Fat on GLP-1: What Actually Matters and What Doesn't
Once protein is locked in, the remaining calories split between carbohydrates and fat — and this is where a lot of GLP-1 users get stuck. The honest truth is that no single carb-to-fat ratio has been proven optimal for weight loss or side-effect management on semaglutide or tirzepatide.
What does matter is fiber, which sits inside the carbohydrate number. Adequate fiber — 25 to 30 grams daily — is the single most effective dietary lever for managing the constipation that affects a significant portion of GLP-1 users. If your macro-tracking app shows total carbs but not fiber, you are missing the piece of data that actually impacts how you feel day to day.
The bigger risk is fixating on a low-carb percentage while neglecting total protein grams. An app that displays all three macros simultaneously — protein, carbs, and fat, each in grams — prevents the tunnel vision that leads someone to celebrate a 20%-carb day while unknowingly eating only 50 grams of protein.
Bottom line
No single carb/fat ratio is proven optimal on GLP-1; the bigger risk is fixating on carb percentage while neglecting total protein grams and fiber — apps that show all three simultaneously prevent that trap.
MacroFactor vs. MyFitnessPal vs. Cronometer: Accuracy Trade-offs Explained
Not all macro numbers are created equal. A 2024 peer-reviewed analysis of popular food-tracking apps found that 37% of crowd-sourced entries in MyFitnessPal had energy-value errors exceeding 20% of the measured value. When you are trying to hit a 90-gram protein target within a tight calorie budget, a 20% error on a single entry can throw off your entire day.
Cronometer takes the opposite approach: its database is built primarily from lab-verified USDA and NCCDB data, not user submissions. That means the protein, carb, and fat numbers you see are far more likely to reflect what is actually on your plate. The trade-off is speed — Cronometer's logging is slower, and its database, while accurate, is smaller for branded and restaurant foods.
MacroFactor sits in a middle ground with a verified common-food database and a coaching algorithm that adjusts your macro targets weekly based on your actual intake and weight trend. MyFitnessPal wins on convenience and database breadth — you will find nearly any food — but you inherit the accuracy risk of crowd-sourced data. Choose Cronometer if precision matters most, MyFitnessPal if logging speed matters most, and MacroFactor if you want the app to do the thinking for you.
Bottom line
Cronometer is the accuracy leader; MyFitnessPal is the convenience leader; MacroFactor is the coaching leader — pick the trade-off that matches how precisely you need to hit your targets.
How to Set Macro Targets in Each App (Step-by-Step)
Setting custom macro targets by gram is the feature that separates a useful tracking app from a generic calorie counter on GLP-1. Here is exactly how to do it in each of the four apps reviewed.
In MacroFactor, open the Strategy tab, select Coached or Manual program, and enter your protein, carb, and fat targets in absolute grams — no percentage math required. The app will distribute them across your calorie budget automatically. Cronometer is similarly direct: go to Settings > Targets > Macronutrient Targets, toggle to Fixed Values, and enter your gram targets for protein, carbs, and fat on the free tier.
MyFitnessPal requires a Premium subscription for custom gram goals. Once subscribed, go to Goals > Calorie, Carbs, Protein, and Fat Goals, switch each macro to Grams, and enter your numbers. On the free tier, you are limited to percentage-based targets, which forces you to do the math yourself. Yazio requires the Pro tier for full macro detail and custom targets; once upgraded, navigate to Profile > Nutrition Goals > Macronutrients and set each to your preferred gram value.
Bottom line
MacroFactor and Cronometer allow absolute gram targets out of the box; MyFitnessPal requires Premium for custom gram goals; Yazio requires Pro.
What Weeks of Macro Data Actually Tell You (and When to Adjust)
A single day of macro data is noise. A week of data is a signal. When you look at your seven-day protein average, you can see whether you are consistently hitting 1.2 g/kg or drifting closer to 0.8 — a level at which muscle loss accelerates on a calorie deficit.
If your weekly protein average falls below 1.0 g/kg, that is a red flag worth bringing to your prescribing clinician or a registered dietitian. The app data becomes the evidence that makes that conversation specific: instead of saying 'I think I'm not eating enough protein,' you can say 'My seven-day average is 72 grams, and at my weight I need at least 90.'
Adjust your targets only when your weight changes meaningfully — roughly every 5 kg lost or gained — since protein needs scale with body mass. Do not chase daily swings; a 60-gram day followed by a 120-gram day averages to 90, and that average is what your body responds to over time.
Bottom line
A 7-day protein average below 1.0 g/kg is a red flag worth discussing with your prescribing clinician — app data is the evidence that makes that conversation specific.
What most pages leave out
Database accuracy varies significantly — a 2024 peer-reviewed analysis found 37% of popular crowd-sourced MyFitnessPal entries had energy-value errors exceeding 20% of the measured value. Apps showing macros to the gram can give false precision if the underlying entries are inaccurate. Cronometer's lab-verified data reduces but does not eliminate this problem.
We flag this so you can make an informed choice — not to scare you off.
❓Frequently Asked Questions
The May 2025 multi-society Advisory proposes 1.2–1.6 grams of protein per kilogram of body weight per day during active weight reduction. For a 75 kg (165 lb) person, that translates to roughly 90–120 grams of protein daily, spread across meals to maximize absorption on a suppressed appetite.
It depends on your priority: MacroFactor is best for adaptive coaching that recalculates your targets weekly, Cronometer is best for nutrient accuracy with lab-verified data, and MyFitnessPal is best for database size and logging convenience. All three display protein, carbs, and fat by gram.
MyFitnessPal's database is large but largely user-submitted, and a 2024 peer-reviewed study found that 37% of popular entries had energy errors exceeding 20%. For high-stakes tracking where precision matters — like hitting a narrow protein target — cross-check entries against Cronometer's lab-verified data when possible.
Yes. Cronometer tracks all three macros — protein, carbohydrates, and fat — in grams on its free tier using lab-verified USDA and NCCDB data. It is the best free option for macro accuracy. MyFitnessPal's free tier limits you to percentage-based macro goals rather than absolute gram targets.
Total carbohydrates plus fiber is the most useful split for GLP-1 users. Fiber matters directly for managing the constipation that commonly accompanies these medications. Net carbs — total carbs minus fiber and sugar alcohols — matter mainly for ketogenic approaches, which are not required for GLP-1 effectiveness.
No specific carbohydrate-to-fat ratio has been proven optimal on tirzepatide. The evidence-based priority is hitting your absolute protein target in grams first — 1.2 to 1.6 g/kg/day — and then filling the remaining calorie budget with a balanced mix of carbs and fat that supports your energy and digestion.
Custom gram goals require a MyFitnessPal Premium subscription. Once subscribed, go to Goals > Calorie, Carbs, Protein, and Fat Goals, switch protein to Grams, and enter your target. On the free tier, you can only set protein as a percentage of total calories, which requires manual math to convert to grams.
Yes — it is the most direct way to confirm you are eating enough protein to counteract the lean-mass loss documented in GLP-1 clinical trials. Without tracking, appetite suppression makes it easy to unknowingly eat half the protein your body needs, accelerating muscle loss alongside fat loss.
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Read moreOn a GLP-1, or thinking about one?
Eating well is the foundation. For some people, a GLP-1 medication is the tool that finally makes appetite manageable.Curex connects you with licensed clinicians for compounded GLP-1 medications, if it's right for you.
- Compounded semaglutide from $49/mo, tirzepatide from $149/mo
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This content is for general informational purposes only and is not medical or nutritional advice, a diagnosis, or a substitute for professional judgment. It does not account for your health, medications, or goals, and nutrition information changes over time. Always talk with a qualified clinician or dietitian before making significant changes to your diet, supplements, or medications. Curex offers compounded GLP-1 medications through licensed clinicians and does not sell or endorse the food or supplement reviewed on this page.