# VO2 Master Manager vs MX3 Diagnostics

The clearest difference is rating: MX3 Diagnostics at 5.0 against VO2 Master Manager's 4.0. MX3 Diagnostics also leads on iOS requirement (10.0 vs 16.0). VO2 Master Manager's advantage is ratings volume (9 vs 2). On price, update cadence, ads and in-app purchases there is nothing between them.

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

MX3 Diagnostics holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 9 and 2 respectively.

VO2 Master Manager ships an update every 5 weeks, MX3 Diagnostics monthly. The most recent releases landed on September 27, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | VO2 Master Manager | MX3 Diagnostics |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (9 ratings)](https://appshunter.io/ios/app/vo2-master-manager/id936519055/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/mx3-diagnostics/id1473092965/reviews)** |
| Number of ratings | **9** | 2 |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Monthly** |
| Monetization | Free | Free |
| Size | 87 MB | 124 MB |
| Requires iOS | 16.0 | **10.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [VO2 MASTER HEALTH SENSORS INC](https://appshunter.io/developer/936519054) | [MX3 DIAGNOSTICS](https://appshunter.io/developer/1309508113) |

## What reviewers say

### VO2 Master Manager

[App page](https://appshunter.io/ios/app/vo2-master-manager/id936519055)

This tool collects and displays performance data including VO2, heart rate, and power. It also monitors speed, cadence, and muscle oxygenation for comprehensive analysis.

**Highlights:** VO2 monitoring, Heart rate tracking, Power data collection, Speed and cadence monitoring, Muscle oxygenation data, Performance analysis

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

**In-app purchases:** none


### MX3 Diagnostics

[App page](https://appshunter.io/ios/app/mx3-diagnostics/id1473092965)

Measure and track hydration and sweat sodium levels quickly and conveniently. This system allows athletes, coaches, and managers to manage hydration data for individuals or teams anytime, anywhere. Personalize assessments and manage athlete accounts.

**Highlights:** Perform hydration measurements, Perform sweat sodium measurements, View and edit historical data, Personalize hydration assessment, Create team/athlete accounts, Update device firmware

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

**In-app purchases:** none


## Frequently asked questions

### Is VO2 Master Manager free?

VO2 Master Manager is free to download, with no in-app purchases.

### Is MX3 Diagnostics free?

MX3 Diagnostics is free to download, with no in-app purchases.

### Which has better reviews, VO2 Master Manager or MX3 Diagnostics?

MX3 Diagnostics is rated higher. VO2 Master Manager averages 4.0 out of 5 from 9 ratings, while MX3 Diagnostics averages 5.0 from 2 ratings.

### Do VO2 Master Manager or MX3 Diagnostics have ads?

Neither VO2 Master Manager nor MX3 Diagnostics shows ads.

### Which is updated more often, VO2 Master Manager or MX3 Diagnostics?

VO2 Master Manager ships an update every 5 weeks, and MX3 Diagnostics monthly. Most recently, VO2 Master Manager was updated on September 27, 2026 and MX3 Diagnostics on September 15, 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.*