Comparison

Starfit vs Function Health

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Starfit

Track your body composition, including BMI, body fat, muscle mass, and more. The app offers intelligent data analysis and reporting, with options for baby or pet weight tracking. It also integrates with Apple Health to share your health data.

Highlights
  • Body composition tracking (BMI, body fat, muscle mass)
  • Body girth measurement
  • Baby/pet weight tracking
  • Cloud-based data analysis
  • HealthKit integration
  • Health reports and charts
Features
Read full description

Healthy Starfit! Starfit is the top app to be healthier. The app can track your body compositions (BMI, body fat percentage , body water , bone mass , the rate of subcutaneous fat , visceral fat levels, basal metabolism body age , muscle mass and so on),it comes with body girth measurement function, allowing baby weight mode for baby weight/pet weight tracking, and cloud -based intelligent data analysis and tracking , providing the perfect healthy body composition analysis charts and reports. HealthKit 1. Starfit will share the weight data (weight/body fat/bmi/Lean body mass ) after each weighing to Apple's health center. 2. Due to the importance of the privacy of your health data, Starfit will prompt you to authorize the sharing of the Apple Health Center after the first time you enter the Homepage.If you want to modify the authorization later, You can view the HealthKit setup instructions in the app system settings Screen. 3. Starfit will not share weight data to Apple's Health Center in the experience mode and guest Mode.

About

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.

Highlights
  • 160+ lab tests annually
  • Personalized health protocols
  • Private AI Chat for results
  • Connect health wearables
  • Advanced MRI & CT scans
  • Upload health records
Features
Read full description

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.

Screenshots

Starfit4 screens
Function Health4 screens

Verdict

The call

The clearest difference is monetization model: Starfit at free against Function Health's subscription. Starfit also leads on device support (3 vs 1) and iOS requirement (13.0 vs 16.4). Function Health's advantage is review sentiment (62% vs 38%) and rating (4.9 vs 4.7). On price, ads and in-app purchases 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Function Health holds the better App Store score, 4.9 against 4.7. Both are backed by a comparable volume of ratings — 5.6K and 25K respectively. Written reviews point the same way: 38% of Starfit's written reviews are positive against 62% of Function Health's.

UpkeepUpdate frequency

Starfit ships an update every 3 weeks, Function Health weekly. The most recent releases landed on October 25, 2026 and October 26, 2026 respectively.

Scorecard7 real differences · 3 level
Starfit versus Function Health: the parameters behind the verdict, then further details
ParameterStarfitFunction Health
PriceFreeFree
Rating4.7 (5.6K ratings)4.9 (25K ratings) — better
Positive reviews37.8% of reviews61.8% of reviews — better
Number of ratings5.6K25K — better
Update frequencyEvery 3 weeksWeekly — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree — betterSubscription
DevicesiPhone, iPod, Apple Watch — betteriPhone
Requires iOS13.0 — better16.4
Further details — not scored
Size166 MB203 MB
Age rating4+17+
DeveloperRUNSTAR FL INC.Function Health

Customer experience

Starfit

All ratings5,324 ratings
Positive91.6%
Neutral2.4%
Negative6.0%
Written reviews336 reviews
Positive37.8%
Neutral14.9%
Negative47.3%

Function Health

All ratings25,022 ratings
Positive99.0%
Neutral0.4%
Negative0.6%
Written reviews348 reviews
Positive61.8%
Neutral5.5%
Negative32.8%

User reviews

Starfit

From 5.6K App Store ratings

What we love

  • 👍 Easy to use
  • 💪 Provides detailed body composition data
  • 🤝 Connects to Apple Watch
  • 🔍 Tracks weight and other metrics over time

Room to improve

  • 🐛 App crashes and connectivity issues
  • 🤔 Inaccurate or questionable body composition measurements
  • 📊 Limited charting and data visualization features
  • 🤷‍♀️ Confusing or inappropriate body type classifications

Function Health

From 25K App Store ratings

What we love

  • 🚀 Seamless process for blood tests and results
  • 📊 Comprehensive health insights and tracking
  • 🧠 Helpful clinician notes and recommendations
  • 👍 User-friendly and visually appealing app
  • 💰 Affordable compared to other options

Room to improve

  • 🔍 Lack of communication and support responsiveness
  • 🐛 Some bugs and usability issues in the app

Bugs and requests

Starfit

Reported bugs

4 issues
  • App crashes on startup
  • Scale fails to connect to app
  • Metrics not recording properly
  • Language settings reverting unexpectedly

Requested features

5 requests
  • Add manual data entry and editing
  • Improve Bluetooth connectivity and syncing
  • Provide more customization and settings options
  • Enhance charting and historical data views
  • Implement pregnancy mode or adjustments

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

In-app purchases

None

Starfit

No in-app purchases

None

Function Health

No in-app purchases

Questions

Is Starfit free?
Starfit is free to download, with no in-app purchases.
Is Function Health free?
Function Health is free to download, with no in-app purchases.
Which has better reviews, Starfit or Function Health?
Function Health is rated higher. Starfit averages 4.7 out of 5 from 5.6K ratings, while Function Health averages 4.9 from 25K ratings.
Do Starfit or Function Health have ads?
Neither Starfit nor Function Health shows ads.
Which is updated more often, Starfit or Function Health?
Starfit ships an update every 3 weeks, and Function Health weekly. Most recently, Starfit was updated on October 25, 2026 and Function Health on October 26, 2026.

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