Marrow Health: Calorie Counter
Fitness tracker & food diary
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
Free calorie counter, fitness tracker and every Apple Health metric. Built-in MCP server: Claude, Cursor or your own agent can read your data. No account, no ads.
Marrow is a free calorie counter and fitness tracker that also puts every Apple Health metric in one place, and gives all of it back to you as files, automations, or a live connection to your AI. No account, no subscription, no ads.
EVERY METRIC, NOT A CURATED FEW
Marrow reads 172 Apple Health data types: steps, heart rate, HRV, sleep stages, blood oxygen, respiratory rate, walking steadiness, body composition, cycle tracking, and the long tail Apple never puts in a chart. Add its own meal diary and strength log and you are tracking 178 data series in one place. If your watch or a connected app records it, Marrow shows it, with daily, weekly, and monthly trends.
FOOD LOGGING THAT IS ACTUALLY FAST
Photograph a meal and get a nutrition estimate you review and edit before it is logged. Scan a barcode. Or search a USDA food database built into the app, which works with no signal at all. Marrow tracks 39 nutrients per meal, not just calories, and writes it all back to Apple Health.
WORKOUTS, STRENGTH AND CARDIO
Log sets and reps against an exercise catalog, or record cardio and see the route. Workout history sits next to the health metrics it moved, so you can see what your training is actually doing.
YOUR DATA LEAVES WHEN YOU WANT IT TO
Export CSV, JSON, or GPX. Schedule automations that post to a server you choose. Pair your own self-hosted mirror. Marrow was built by someone who got tired of health data being trapped in an app that would not give it back.
BUILT FOR AI, IF YOU WANT IT
Marrow can serve your health data over the Model Context Protocol, so Claude, Cursor, or any MCP client can read it with a token you control. It ships turned off, runs on your own device, and costs nothing.
WHAT MARROW DOES NOT DO
No account. No subscription. No ads. No analytics or tracking SDKs. No selling data. Your health data stays on your iPhone unless you deliberately send it somewhere, and the app makes it obvious when that happens.
Requires iOS 17 or later and Apple Health.
Marrow is a wellness tool. It does not diagnose, treat, cure, or prevent any condition, and it does not give medical advice.
A new Data tab. A dashboard you can arrange: a weekly focus carousel (nutrition, activity, sleep), sections of tiles for every metric, and a Customize screen to pick what shows and in what order.
Every metric now opens the same page: average and difference, a chart with your goal line, 1W to All ranges, daily, weekly or monthly grouping, a plain explainer, and a table of 3 to 90 day changes. Tap the arrows to expand the chart.
Habits: Food Logging, Weigh-In and Workout Days as calendars. Tap a past day to add a weigh-in or a workout.
Lifts: a page per exercise with estimated one-rep max or average weight. Muscles worked as a tile and a page.
Theme: System, Light or Dark in Settings. Food rows show product photos or icons. Steps, sleep and exercise goals in Goals draw the dashed lines.
The developer, JOHN AIDAN HALL, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- User Content
- Identifiers
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- JOHN AIDAN HALL
- Size
- 9.8 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 29 more
- English, Arabic, Czech, Danish, Dutch, Finnish, French, German, Greek, Hebrew, Hindi, Hungarian, Indonesian, Italian, Japanese, Korean, Malay, Norwegian Bokmål, Polish, Portuguese, Romanian, Russian, Simplified Chinese, Spanish, Swedish, Thai, Traditional Chinese, Turkish, Ukrainian, Vietnamese
- Age Rating
9+
- 9+
- Contains
Health or Wellness Topics
- Copyright
- © 2026 Aidan Hall
