Function Health vs TrackOS
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Function Health
Take control of your health with comprehensive lab testing, personalized protocols, and AI-powered insights. Understand your body's data, track changes over time, and make informed decisions for long-term wellness. Connect wearables and upload records for a complete health picture.
- 160+ lab tests annually
- Personalized health protocols
- Private AI Chat for results
- Connect health wearables
- Advanced MRI & CT scans
- Upload health records
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Function membership helps you take control of your health with 160+ lab tests each year, personalized Protocols, and Private AI Chat—all backed by advanced science and your real data. Built with top doctors, Function gives you the power to understand your body, track how it evolves, and make meaningful change. NOW AVAILABLE: HOME OR OFFICE BLOOD DRAWS Schedule a concierge blood draw at your home or office. A licensed specialist comes to you and completes your blood draw in under 20 minutes. Available in select locations. 160+ LAB TESTS Membership includes testing for your heart, hormones, thyroid, liver, kidneys, toxins, nutrients, inflammation, autoimmunity, immunity and more. ADVANCED MRI & CT SCANS Detect early signs of cancer and hundreds of other potential conditions with the option to purchase advanced imaging for your brain, pancreas, liver, spine, ovaries, prostate, heart and much more. PRIVATE AI CHAT Ask questions about your results, identify meaningful patterns, and figure out where to focus next, with Private AI Chat—built in partnership with top clinicians. CONNECT WEARABLES Connect Apple Health and other health devices and wearables to see how your activity, sleep, and daily habits affect your lab test results and long-term health. PROTOCOLS Translate your lab results, scans and health history into clear, evidence-based plans for nutrition, activity, and supplements—all customizable to your goals and preferences. UPLOAD HEALTH RECORDS Upload past lab test results, scans, and other medical records for a more complete view of your health, all in one secure place. PROGRESS YOU CAN SEE Twice-yearly and On-Demand testing helps you track your results over time, monitor for early signs of disease, and identify where to focus next. ADVANCED LAB TESTS Membership includes 160+ lab tests, plus the option to purchase advanced On-Demand tests for: - Detection of 50+ cancers - Alzheimer’s risk detection - MTHFR gene variants - Advanced MRI and CT scans starting at $365 - Food allergies and sensitivities - …and much more ACCESSIBILITY What could cost as much as $15,000 on your own is included with membership for just $365/year. Lab testing is available at over 2,000 lab locations across the US, with no insurance needed. SECURITY Function was built for privacy and security. Function is built to HIPAA standards. Your information is secure. How it works: 1. Join Function and schedule your first set of lab tests. 2. Get your results and personalized Protocols. Ask questions with your Private AI Chat. 3. See your progress with 60+ lab tests at your Mid-Year Test. 4. Purchase MRI or CT scans and other advanced On-Demand Tests any time. DISCLAIMER Function Health is a technology company and not a laboratory or medical provider. All laboratory and medical services are provided by independent third parties. Function Health does not offer medical advice, laboratory services, a diagnosis, medical treatment, or any form of a medical opinion; its services are not a substitute for medical care, medical advice, and/or a detailed discussion with a physician or other licensed provider. If you have any questions regarding any laboratory results or any other information that you access through Function Health, you should contact a physician or other licensed provider. All material, information, data, and content that Function Health provides is strictly for general information purposes. For additional important information: https:// www.functionhealth.com/terms-of-service.
TrackOS
Easily log your daily nutrition, including calories, macros, and specific food items. Record your exercise routines, sets, reps, and weight. Set personal fitness goals and monitor your progress with a comprehensive dashboard.
- Calorie and macro tracking
- Food barcode scanning
- Workout logging
- Personal goal setting
- Progress monitoring dashboard
- Customizable themes
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TrackOS makes it simple to track your nutrition, workouts, weight, and fitness goals in one place. TRACK CALORIES & MACROS Log calories, protein, carbohydrates, and fat. Search Open Food Facts, reuse recent foods, or scan food barcodes. Check the serving basis and adjust entries to match your portion. TRACK YOUR WORKOUTS Record exercises, sets, reps, and weight used. Search for exercises and review your training history. SET PERSONAL GOALS Estimate daily calorie and macro targets for adult fitness goals. Find formulas, assumptions, limitations, and linked references under Nutrition sources & calculations. Estimates are for general wellness and are not medical advice. MONITOR YOUR PROGRESS Log body weight and see daily calorie goals, macro progress, workout totals, and streaks on your dashboard. MAKE IT YOURS Choose light mode, dark mode, or your device setting. Numeric fields include an iOS Done button. TRACKOS PREMIUM A one-time TrackOS Premium Lifetime purchase unlocks meal ideas, workout suggestions, advanced analytics, and an ad-free experience. Meal ideas are examples; enter nutrition for your actual ingredients and portions. Track your food. Track your training. Track your progress.
Screenshots
Verdict
Function Health and TrackOS both sit at 4.9 stars, but that hides the real split: 100% of TrackOS's written reviews are positive against 62% of Function Health's. TrackOS also leads on update cadence (every 2 days vs weekly) and device support (3 vs 1). Function Health's advantage is in-app purchases (none vs 1) and ads (none vs shown). On price, rating and iOS requirement there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. TrackOS sells 1 one-off in-app purchase. Function Health asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 4.9 for Function Health against 5.0 for TrackOS. That said, the two scores are not equally well evidenced: Function Health has 25K ratings behind it against 4, so its average is the more settled of the two. Written reviews are what separate them: 62% of Function Health's written reviews are positive against 100% of TrackOS's.
Function Health ships an update weekly, TrackOS every 2 days. The most recent releases landed on October 15, 2026 and October 9, 2026 respectively.
| Parameter | Function Health | TrackOS |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (25K ratings) | 5.0 (4 ratings) — better |
| Positive reviews | 62.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 25K — better | 4 |
| Update frequency | Weekly | Every 2 days — better |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Subscription | Free with in-app purchases — better |
| Devices | iPhone | iPhone, iPad, iPod — better |
| Requires iOS | 16.4 | 15.0 — better |
| Further details — not scored | ||
| Size | 202 MB | 40 MB |
| Age rating | 17+ | 4+ |
| Developer | Function Health | Daybreak Energy LLC |
Customer experience
Function Health
TrackOS
Bugs and requests
Function Health
Reported bugs
2 issues- App sometimes redirects back to the home screen when trying to view results
- Occasional typos and formatting issues in the app
Requested features
3 requests- More customization options in the app settings
- Ability to print or export test results and recommendations
- Specific supplement recommendations rather than broad suggestions
TrackOS
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Function Health
No in-app purchases
TrackOS
- TrackOS Premium Lifetime$3.99









