# M System vs Trace

The clearest difference is in-app purchases: M System at none against Trace's 1. M System also leads on iOS requirement (15.0 vs 17.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Trace sells 1 one-off in-app purchase. M System asks for nothing beyond the download.

Both ship on a similar rhythm, roughly weekly. The most recent releases landed on October 24, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | M System | Trace |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Weekly | Weekly |
| Size | 206 MB | 1 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | +4 |
| Developer | [Vu Pham Anh](https://appshunter.io/developer/1674956591) | [Roman Kopaliani](https://appshunter.io/developer/1635315269) |

## What reviewers say

### M System

[App page](https://appshunter.io/ios/app/m-system/id6445936927)

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

**In-app purchases:** none


### Trace

[App page](https://appshunter.io/ios/app/trace-soap-and-lye-calculator/id6778435536)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Trace Pro (lifetime) | $6.99 | one-time |


## Frequently asked questions

### Is M System free?

M System is free to download, with no in-app purchases.

### Is Trace free?

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

### Do M System or Trace have ads?

Neither M System nor Trace shows ads.

### Which is updated more often, M System or Trace?

M System ships an update weekly, and Trace weekly. Most recently, M System was updated on October 24, 2026 and Trace on October 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.*