# Function Health vs TrackOS

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.

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.

## The numbers

| Metric | Function Health | TrackOS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.9 (25K ratings)](https://appshunter.io/ios/app/function-health/id6471280307/reviews) | **[5.0 (4 ratings)](https://appshunter.io/ios/app/trackos/id6808067450/reviews)** |
| Number of ratings | **25K** | 4 |
| Positive reviews | 62.0% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Weekly | **Every 2 days** |
| Monetization | Subscription | **Free with in-app purchases** |
| Best chart rank | **#205** | — |
| Size | 202 MB | 40 MB |
| Requires iOS | 16.4 | **15.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [Function Health](https://appshunter.io/developer/1715014524) | [Daybreak Energy LLC](https://appshunter.io/developer/6808067452) |

## What reviewers say

### Function Health

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

**Currently charting:** #205 Top Free · Health & Fitness (US App Store)

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


### TrackOS

[App page](https://appshunter.io/ios/app/trackos/id6808067450)

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.

**Highlights:** Calorie and macro tracking, Food barcode scanning, Workout logging, Personal goal setting, Progress monitoring dashboard, Customizable themes

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| TrackOS Premium Lifetime | $3.99 | one-time |


## Frequently asked questions

### Is Function Health free?

Function Health is free to download, with no in-app purchases.

### Is TrackOS free?

TrackOS is free to download, with in-app purchases available.

### Which has better reviews, Function Health or TrackOS?

TrackOS is rated higher. Function Health averages 4.9 out of 5 from 25K ratings, while TrackOS averages 5.0 from 4 ratings.

### Do Function Health or TrackOS have ads?

TrackOS shows ads; Function Health does not.

### Which is updated more often, Function Health or TrackOS?

Function Health ships an update weekly, and TrackOS every 2 days. Most recently, Function Health was updated on October 15, 2026 and TrackOS on October 9, 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.*