# Nix Solo vs Syncosystem

The clearest difference is in-app purchases: Nix Solo at none against Syncosystem's 2. Nix Solo also leads on device support (4 vs 2). On price, update cadence, ads and iOS requirement there is nothing between them.

Both are free to download. Syncosystem sells 2 in-app purchases, starting at $9.99 per month. Nix Solo asks for nothing beyond the download.

Nix Solo ships an update every 10 days, Syncosystem every 9 days. The most recent releases landed on October 13, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Nix Solo | Syncosystem |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (61 ratings)](https://appshunter.io/ios/app/nix-solo/id1632680170/reviews)** | — |
| Number of ratings | **61** | — |
| Positive reviews | 14.3% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 10 days | **Every 9 days** |
| Monetization | Free | — |
| Size | 65 MB | 57 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Nix, Inc.](https://appshunter.io/developer/1625732872) | [Precision Weight Loss Center LLC](https://appshunter.io/developer/1446337371) |

## What reviewers say

### 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


### Syncosystem

[App page](https://appshunter.io/ios/app/syncosystem/id6444194783)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly | $9.99 | per month |
| Premium Yearly | $99.99 | per year |


## Frequently asked questions

### Is Nix Solo free?

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

### Is Syncosystem free?

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

### Do Nix Solo or Syncosystem have ads?

Neither Nix Solo nor Syncosystem shows ads.

### Which is updated more often, Nix Solo or Syncosystem?

Nix Solo ships an update every 10 days, and Syncosystem every 9 days. Most recently, Nix Solo was updated on October 13, 2026 and Syncosystem on October 12, 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.*