Free on the App Store. No account needed.
Meet Marrow Track your food, your lifts and all of Apple Health
Marrow is a free calorie counter and fitness tracker for iPhone. Log a meal by photo, barcode or voice, log your workouts, and see 178 health metrics in one place. Then connect it to ChatGPT, Claude or Gemini.
Download on theApp Store
One app for everything you track
Calories and macros
Targets, meals and the day's totals on one screen.
Sleep by stage
A month of nights with the average and the total.
Log in seconds
Photo, barcode, voice, a typed line, or search.
Heart rate and HRV
Every reading from your watch or ring, with trends.
Every lift, charted
Sets, estimated 1RM and a map of what you trained.
Connect your AI
ChatGPT, Claude or Gemini read your real numbers.
What does Marrow include?
Why choose Marrow?
The things other apps put behind a subscription are free here.
Free where others charge
Barcode scanning, CSV export, scheduled exports and AI access cost nothing. MyFitnessPal Premium is $19.99 a month.
Works with what you already own
Apple Watch, Oura, Whoop, Garmin, Withings and anything else that writes to Apple Health. An iPhone on its own is enough.
Private by default
No account, no ads, nothing sold. Your data lives on your iPhone, and the only things that leave are the ones you send.
What other apps charge for
Checked against each company's own pricing page in August 2026.
| Marrow | MyFitnessPal | Health Auto Export | Apple Health | |
|---|---|---|---|---|
| Price | Free, Pro optional | $19.99 a month or $79.99 a year | $2.99 Basic, $6.99 a year, $24.99 lifetime | Free |
| Food and workout logging | Free, 39 nutrients | Free tier, limited | Not a logging app | Manual entry only |
| Barcode scanning | Free | Premium only | Not a logging app | None |
| Health metrics | 178 | Nutrition and activity only | 150+ | Everything |
| CSV and JSON export | Free | Premium only | Free (manual) | One manual XML dump |
| Automated export | Free | None | Premium only | None |
| AI agent access (MCP) | Free | None | Premium only | None |
| Account required | No | Yes | No | No |
| Ads | None | On the free tier | None | None |
Sources: MyFitnessPal's pricing page and its export documentation; the Health Auto Export App Store listing and its MCP prerequisites. MyFitnessPal free accounts can still request a data download under GDPR and CCPA; the in-app CSV export is the Premium feature. Health Auto Export is a good app and got to MCP before Marrow did. The difference is who has to pay for it.
Marrow Pro
Connect ChatGPT, Claude or Gemini to your health data
One link, approved from your phone. Ask why your sleep got worse, whether you are eating enough protein, or what to change in your training, and get answers from your real numbers. The AI can read and never write.
I know where I want to be with my health but not exactly how to get there. It noticed that when I ate high-protein dinners I often slept poorly, which I had never thought about.
Your data stays on your phone
No account
There is nothing to sign up for and no login to lose. Install it, allow Apple Health access, and it works.
On your iPhone
The database lives on the phone, and every average, baseline and trend is computed there.
No ads, nothing sold
Marrow has no advertising and does not sell your data.
Photos are not kept
A meal photo loses its location and timestamp before it is sent, and is discarded once the food is identified.
Connect is yours to delete
The private copy your AI reads exists only while Connect is on. Turn it off and the copy is deleted.
Read the privacy policy. It is written in plain language.
Free, with an optional Pro plan
Everything that makes Marrow worth installing is free and stays free. Pro pays for the three things that cost money per use.
Marrow
Free
- Food, workout and weight logging
- All 178 health metrics, with charts and history
- Three AI food logs a day
- CSV, JSON and GPX export, and scheduled exports
- AI access you run yourself, on the phone or your own server
No account, no ads, no trial that runs out.
Marrow Pro
$4.99 a month, $34.99 a year, or $59.99 once
- Unlimited AI food logging by photo, barcode, voice and text
- Connect your AI: ChatGPT, Claude or Gemini, with nothing to run
- Campus dining menus at 46 universities
Monthly and yearly start with a 7-day free trial. What Pro includes
Frequently asked questions
The questions people ask most.
Is Marrow really free?
Yes. Logging, every health metric, the charts, the exports and the self-hosted AI connections are free with no time limit. Pro is optional.
Do I need an Apple Watch?
No. An iPhone counts steps and distance on its own, and you can log food, workouts and weight by hand. A watch or ring adds sleep, heart rate and HRV.
Do I need to make an account?
No. There is no Marrow account. Install it, allow Apple Health access, and it works.
Which AI assistants can it connect to?
ChatGPT, Claude and Gemini through Connect your AI. Claude works on its free plan; ChatGPT needs a paid plan and Gemini needs Google AI Pro. Claude Code, Claude Desktop, Cursor and other MCP clients work through the free options.
Is there an Android version?
No. Marrow is built on Apple Health and needs an iPhone on iOS 17 or later.
Something is not working. Who do I ask?
Marrow is built by one person, and that person answers the support email: [email protected]. The support page covers the common problems.