# MX3 Diagnostics vs Nix Solo

The clearest difference is ratings volume: Nix Solo at 60 against MX3 Diagnostics's 2. Nix Solo also leads on update cadence (every 10 days vs monthly). MX3 Diagnostics's advantage is rating (5.0 vs 4.8) and iOS requirement (10.0 vs 15.1). On price, ads, in-app purchases and monetization model 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 4.8. That said, the two scores are not equally well evidenced: Nix Solo has 60 ratings behind it against 2, so its average is the more settled of the two.

MX3 Diagnostics ships an update monthly, Nix Solo every 10 days. The most recent releases landed on August 20, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | MX3 Diagnostics | Nix Solo |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/mx3-diagnostics/id1473092965/reviews)** | [4.8 (60 ratings)](https://appshunter.io/ios/app/nix-solo/id1632680170/reviews) |
| Number of ratings | 2 | **60** |
| Positive reviews | — | 14.3% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Every 10 days** |
| Monetization | Free | Free |
| Size | 124 MB | 65 MB |
| Requires iOS | **10.0** | 15.1 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [MX3 DIAGNOSTICS](https://appshunter.io/developer/1309508113) | [Nix, Inc.](https://appshunter.io/developer/1625732872) |

## What reviewers say

### 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


### Nix Solo

[App page](https://appshunter.io/ios/app/nix-solo/id1632680170)

Monitor personal fluid and electrolyte losses in real-time during workouts. This app provides insights into sweat composition and hydration needs based on individual biology, using data from a companion biosensor.

**Highlights:** Real-time fluid and electrolyte loss monitoring, Personalized sweat composition insights, Correlates sweat data with environmental factors (Nix Index), Post-workout Sweat Intelligence reports, Integration with Apple Watch and Garmin devices, Workout type and hydration input

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is MX3 Diagnostics free?

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

### Is Nix Solo free?

Nix Solo is free to download, with no in-app purchases.

### Which has better reviews, MX3 Diagnostics or Nix Solo?

MX3 Diagnostics is rated higher. MX3 Diagnostics averages 5.0 out of 5 from 2 ratings, while Nix Solo averages 4.8 from 60 ratings.

### Do MX3 Diagnostics or Nix Solo have ads?

Neither MX3 Diagnostics nor Nix Solo shows ads.

### Which is updated more often, MX3 Diagnostics or Nix Solo?

MX3 Diagnostics ships an update monthly, and Nix Solo every 10 days. Most recently, MX3 Diagnostics was updated on August 20, 2026 and Nix Solo on September 21, 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.*