Sustain, by hearthlyapps

Lose fat.
Not muscle.

The companion app for Ozempic, Wegovy, Zepbound, Mounjaro and more, built around the #1 concern GLP-1 communities talk about, and the one thing most trackers ignore.

Download on the App Store
Your day, at a glance

Dose, protein, and weight: one screen, zero digging.

Your next dose, today's protein progress, and your weight trend all live on one screen, so you're not digging through three different tabs just to check in on your own day.

Photo-to-protein

Snap a plate. Get grams. No manual logging grind.

Point your camera at a meal and Sustain's AI breaks it down item by item, estimating grams of protein in seconds. It's built specifically for the #1 anxiety GLP-1 users share: losing muscle along with the fat.

Weekly recap

AI insights that connect protein, adherence, and weight loss pace.

Instead of restating a number you already saw on the chart above it, Sustain's weekly recap connects the dots: how your protein intake relates to how fast you're losing weight, and whether your habits are the kind that carry you through a plateau.

Side effects

Log symptoms, spot patterns, share them with your prescriber.

Log nausea, fatigue, or anything else you notice, and Sustain builds a pattern report you can actually bring to your next appointment, not just a screenshot of a symptom diary.

Reached your goal?

A maintenance guide for phase two, not just phase one.

Hitting your goal weight isn't the finish line, it's a new phase. Sustain's Maintenance Program helps you navigate the "what now" moment with a real range to aim for and questions worth asking your prescriber.

Why Sustain

Every other tracker was built around the scale.
Sustain is built around the mirror.

Muscle-preservation focus

Fast weight loss on too little protein is a real risk, and Sustain is the first tracker built around catching it, not just logging the scale.

Dose & titration tracking

Injection or oral, weekly or daily: log doses, rotate injection sites, and plan your next titration step ahead of time.

Photo-to-protein, in seconds

Snap a photo of your plate, and Sustain's AI estimates grams of protein instantly, no manual food-logging grind.

An AI recap worth reading

Not a restated stat: three real findings each week connecting your protein, adherence, and weight trend, in plain language.

Private by default

Your data is backed up to your own account and kept private to you. HealthKit sync is optional, off by default, and always yours to control.

A real plan for "what now?"

Reaching your goal weight isn't the end. Sustain's Maintenance Program helps you navigate phase two, on your terms.

Pricing

Manual logging is free, forever.

Dose, weight, and protein logging never require a subscription. Sustain+ unlocks the AI features and your full history.

Monthly
$7.99/month
7-day free trial
  • Photo protein estimates
  • Full history & trends
  • Weekly AI recap
  • Side-effect pattern reports
  • Cancel anytime
Maintenance Program
$19.99one-time
Unlocks when you reach your goal
  • A maintenance range, not a falling number
  • A prescriber conversation guide
  • One-time purchase, no added subscription
Not medical advice

Sustain helps you track and understand your own data. It never diagnoses, never suggests a dose change, and always defers to your prescriber.