Comparison

Function Health vs Stelo by Dexcom

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

Head to head
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.

About

Stelo by Dexcom

Easily track your glucose levels 24/7 without fingersticks or a prescription. Gain personalized insights to understand how diet and exercise impact your health. This app empowers you to build healthier habits and take control of your well-being.

Highlights
  • 24/7 glucose tracking
  • No fingersticks required
  • Personalized health insights
  • Diet and exercise personalization
  • Form healthy habits
  • No prescription needed
Features
Read full description

Welcome to the revolution in personalized glucose health. The Stelo by Dexcom Glucose Biosensor finally gives you an easy way to track your glucose and form healthy habits. No fingerpicks. No prescription. Just results. Stelo sets the standard in glucose innovation – delivering 24/7 access to personal glucose insights, empowering you to uncover what works for you. Our smartphone* app, gives you the power to personalize your diet and exercise choices, so healthy habits can become second nature.¹ With Stelo, you can revolutionize the way you track your glucose – giving you everything you need to become a healthier you. Stelo Glucose Biosensor required for Stelo by Dexcom app use – sold separately at www.Stelo.com Stelo is indicated for adults 18+ who don’t use insulin. STELO IMPORTANT INFORMATION: Consult your healthcare provide before making any medication adjustments based on your sensor readings. Do not use if you have problematic hypoglycemia. Failure to use Stelo and its components according to the instructions for use provided and to properly consider all indications, contraindications, warnings, precautions, and cautions in those instructions for use may result in your missing a severe hypoglycemia (low blood glucose) or hyperglycemia (high blood glucose) occurrence. If your sensor readings are not consistent with your symptoms, a blood glucose meter may be an option as needed and consult your healthcare provider. Seek medical advice and attention when appropriate, including before making any medication adjustments an/or for any medical emergency. *For Stelo app compatibility information, visit stelo.com/compatibility. ¹ Stelo User Guide: MT-1000421

Screenshots

Function Health4 screens
Stelo by Dexcom4 screens

Verdict

The call

The clearest difference is review sentiment: Function Health at 62% against Stelo by Dexcom's 18%. Function Health also leads on rating (4.9 vs 2.5) and update cadence (weekly vs every 6 weeks). Stelo by Dexcom's advantage is monetization model (free vs subscription) and chart position (#133 vs unranked). On price, ads, in-app purchases and device support 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 2.5. That said, the two scores are not equally well evidenced: Function Health has 25K ratings behind it against 567, so its average is the more settled of the two. Written reviews point the same way: 62% of Function Health's written reviews are positive against 18% of Stelo by Dexcom's.

UpkeepUpdate frequency

Function Health ships an update weekly, Stelo by Dexcom every 6 weeks. Both last shipped on September 24, 2026.

Scorecard7 real differences · 4 level
Function Health versus Stelo by Dexcom: the parameters behind the verdict, then further details
ParameterFunction HealthStelo by Dexcom
PriceFreeFree
Rating4.9 (25K ratings) — better2.5 (567 ratings)
Positive reviews61.9% of reviews — better18.1% of reviews
Number of ratings25K — better567
Update frequencyWeekly — betterEvery 6 weeks
AdsNoNo
In-app purchasesNoNo
MonetizationSubscriptionFree — better
Best chart rank—#133 — better
DevicesiPhoneiPhone, Apple Watch — better
Requires iOS16.4 — better18.6
Further details — not scored
Size199 MB311 MB
Age rating17+17+
DeveloperFunction HealthDexcom

Customer experience

Function Health

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

Stelo by Dexcom

All ratings567 ratings
Positive30.0%
Neutral10.6%
Negative59.4%
Written reviews746 reviews
Positive18.1%
Neutral19.7%
Negative62.2%

User reviews

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

Stelo by Dexcom

From 567 App Store ratings

What we love

  • 🚀 Easy sensor setup
  • 👍 Intuitive app interface
  • 🔍 Helpful for understanding glucose trends
  • 💡 Integrates with Apple Health

Room to improve

  • 🐛 Sensor accuracy issues
  • 🔍 Limited data history and analysis
  • 🤖 Lack of human customer support
  • 🔍 Inability to calibrate sensor
  • 🔍 Inconsistent Apple Watch integration

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

Stelo by Dexcom

Reported bugs

3 issues
  • Sensor session ending prematurely
  • Inconsistent data syncing with Apple Health
  • App freezing and crashing issues

Requested features

5 requests
  • Ability to view and export historical glucose data
  • Option to customize glucose target ranges
  • Integration with more fitness/nutrition apps
  • Improved Apple Watch support with complications
  • Enhanced meal and activity tracking features

In-app purchases

None

Function Health

No in-app purchases

None

Stelo by Dexcom

No in-app purchases

Questions

Is Function Health free?
Function Health is free to download, with no in-app purchases.
Is Stelo by Dexcom free?
Stelo by Dexcom is free to download, with no in-app purchases.
Which has better reviews, Function Health or Stelo by Dexcom?
Function Health is rated higher. Function Health averages 4.9 out of 5 from 25K ratings, while Stelo by Dexcom averages 2.5 from 567 ratings.
Do Function Health or Stelo by Dexcom have ads?
Neither Function Health nor Stelo by Dexcom shows ads.
Which is updated more often, Function Health or Stelo by Dexcom?
Function Health ships an update weekly, and Stelo by Dexcom every 6 weeks. Most recently, Function Health was updated on September 24, 2026 and Stelo by Dexcom on September 24, 2026.

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