# Function Health vs Stelo by Dexcom

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.

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

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.

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

## The numbers

| Metric | Function Health | Stelo by Dexcom |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (25K ratings)](https://appshunter.io/ios/app/function-health/id6471280307/reviews)** | [2.5 (567 ratings)](https://appshunter.io/ios/app/stelo-by-dexcom/id6475610406/reviews) |
| Number of ratings | **25K** | 567 |
| Positive reviews | **61.9% of reviews** | 18.1% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Weekly** | Every 6 weeks |
| Monetization | Subscription | **Free** |
| Best chart rank | — | **#133** |
| Size | 199 MB | 311 MB |
| Requires iOS | **16.4** | 18.6 |
| Devices | iPhone | **iPhone, Apple Watch** |
| Age rating | 17+ | 17+ |
| Developer | [Function Health](https://appshunter.io/developer/1715014524) | [Dexcom](https://appshunter.io/developer/457035738) |

## What reviewers say

### Function Health

[App page](https://appshunter.io/ios/app/function-health/id6471280307)

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:** Apple Wallet

**In-app purchases:** none

**What reviewers like**

- 🚀 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

**What reviewers complain about**

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

**Reported bugs**

- App sometimes redirects back to the home screen when trying to view results
- Occasional typos and formatting issues in the app

**Requested features**

- 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

[App page](https://appshunter.io/ios/app/stelo-by-dexcom/id6475610406)

**Currently charting:** #133 Top Free · Health & Fitness (US App Store)

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:** Apple Watch app

**In-app purchases:** none

**What reviewers like**

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

**What reviewers complain about**

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

**Reported bugs**

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

**Requested features**

- 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


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*