Comparison

Levels 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

Levels

Gain deep insights into your body's metabolic health through advanced lab testing and continuous glucose monitoring. This app uses AI to track your habits and provides personalized suggestions to optimize your diet, exercise, and sleep for improved well-being.

Highlights
  • Comprehensive lab testing
  • Continuous glucose monitoring
  • AI-powered habit tracking
  • Personalized health suggestions
  • Glucose level correlation with food and exercise
  • Progress tracking with Zone Scores
  • Integration with Apple Health
Read full description

Levels helps you understand your body through comprehensive lab testing, glucose monitoring, and AI-powered habit tracking—so you can take daily action and improve what matters most. Levels is backed by advisors who are key leaders in metabolic health: Dr. David Perlmutter; Dr. Robert Lustig; Dr. Sara Gottfried; Dr. Terry Wahls; Ben Bikman, PhD; Dom D'Agostino, PhD, and was co-founded by Dr. Casey Means. LEVELS CHANGES HOW PEOPLE LIVE THEIR LIVES: - "I'm far more aware of my body and its reactions to food, exercise, sleep, and stress. I feel better when I have more food choices than when I was limiting myself too much." —Laurel Touby, 59, New York - "I was focused on course correcting my dietary and lifestyle choices to improve my metabolic health, but I realized very quickly that it was much more than that. This is not about deprivation and what I cannot eat." —Celia Chen, 49, Los Angeles - "It's the combination of intermittent fasting and using the CGM that has accelerated my metabolic health optimization. I finally feel like I've cracked the code on my body." —Chris Wise, 42, Los Angeles Everybody has health goals. Whether you're tuning your diet, optimizing your exercise, or just trying to stay healthy, monitoring your blood glucose with Levels can help—you'll finally be able to unlock what will work best for YOUR body. NUTRITION Your favorite "healthy" foods may be holding you back from feeling your best. Learn exactly how your diet affects your glucose so you can cut through diet and nutrition advice and find what works for you. FITNESS To stay energized throughout your workouts, you have to know how to fuel properly. Levels helps you eat the right food at the right time to help you improve metabolic flexibility, which can give you stable energy outside of the gym. LONGEVITY By monitoring your blood glucose to see what your diet does to your body in real-time, you may be able to reduce the risk of developing chronic diseases, and you may maximize long-term health. FEATURES - Connect compatible glucose biosensors to track your levels - Log food and exercise to see how they correlate to your glucose levels - In-app, personalized suggestions to improve your glucose stability - Compare meals to see how food swaps affect blood glucose - Track your progress with Zone Scores and daily reports - Challenge yourself to keep your glucose levels stable throughout the day - View lab results alongside your glucose data - Levels integrates with Apple Health to sync exercise logs automatically, which creates personalized insights for how your glucose is trending based on your Apple Health metrics like sleep hours, step count, heart rate, weight, and age DISCLAIMER The Levels app is not designed or intended to diagnose, treat, cure, or prevent any disease or condition; it is intended for general-wellness purposes only. Users should make medical decisions only through consultation with their physicians, and not based on any information presented in the Levels app. For additional information: Privacy Policy: https://levels.link/privacy Terms of Service: https://levels.link/terms Levels Glucose and Lifestyle Data Patterns in the General Population Study: https://levels.link/study

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

Levels4 screens
Function Health4 screens

Verdict

The call

The clearest difference is in-app purchases: Function Health at none against Levels's 3. Function Health also leads on rating (4.9 vs 4.7) and review sentiment (62% vs 52%). On price, update cadence, ads and monetization model 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. Levels sells 3 in-app purchases, starting at $15.00 per month. Function Health asks for nothing beyond the download.

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 — 6.7K and 25K respectively. Written reviews point the same way: 52% of Levels's written reviews are positive against 62% of Function Health's.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly weekly. The most recent releases landed on September 22, 2026 and September 24, 2026 respectively.

Scorecard4 real differences · 6 level
Levels versus Function Health: the parameters behind the verdict, then further details
ParameterLevelsFunction Health
PriceFreeFree
Rating4.7 (6.7K ratings)4.9 (25K ratings) — better
Positive reviews51.7% of reviews61.9% of reviews — better
Number of ratings6.7K25K — better
Update frequencyWeeklyWeekly
AdsNoNo
In-app purchasesYesNo — better
MonetizationSubscriptionSubscription
DevicesiPhoneiPhone
Requires iOS16.616.4 — better
Further details — not scored
Size208 MB199 MB
Age rating17+17+
DeveloperLevels Health IncFunction Health

Customer experience

Levels

All ratings6,691 ratings
Positive91.5%
Neutral3.8%
Negative4.7%
Written reviews174 reviews
Positive51.7%
Neutral12.1%
Negative36.2%

Function Health

All ratings24,661 ratings
Positive99.0%
Neutral0.4%
Negative0.6%
Written reviews341 reviews
Positive61.9%
Neutral5.6%
Negative32.6%

User reviews

Levels

From 6.7K App Store ratings

What we love

  • 🚀 Indispensable app for CGM users
  • 🔍 Provides life-changing data and insights
  • 📊 Excellent program for health optimization
  • 🔍 Transformative for metabolic health
  • 🤖 AI meal analysis is surprisingly accurate

Room to improve

  • 🐛 Buggy and glitchy app
  • 🤖 AI meal analysis fails often
  • 🤯 Overwhelming amount of data and features
  • 🤖 Lack of personalized dietary suggestions
  • 💰 Premium price for limited functionality

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

Levels

Reported bugs

4 issues
  • Delayed or out-of-sync data from sensors
  • Inconsistent behavior when logging meals
  • Inability to reliably edit or recover entries
  • Frequent crashes and unresponsive UI

Requested features

5 requests
  • Sync with popular food logging apps
  • Continuous glucose graph instead of daily view
  • Ability to disable the gamification elements
  • More personalized insights and recommendations
  • Improved user interface and navigation

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

3 purchases

Levels

Subscriptions3
  • Monthly$15.001 Month
  • Annual$80.001 Year
  • Levels Premium$284.991 Year
None

Function Health

No in-app purchases

Questions

Is Levels free?
Levels is free to download, with in-app purchases available.
Is Function Health free?
Function Health is free to download, with no in-app purchases.
Which has better reviews, Levels or Function Health?
Function Health is rated higher. Levels averages 4.7 out of 5 from 6.7K ratings, while Function Health averages 4.9 from 25K ratings.
Do Levels or Function Health have ads?
Neither Levels nor Function Health shows ads.
Which is updated more often, Levels or Function Health?
Levels ships an update weekly, and Function Health weekly. Most recently, Levels was updated on September 22, 2026 and Function Health on September 24, 2026.

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