# Z21 mobile vs Model Train Script

The clearest difference is in-app purchases: Z21 mobile at none against Model Train Script's 2. Z21 mobile also leads on iOS requirement (6.1.6 vs 18.6). Model Train Script's advantage is update cadence (every 3 weeks vs every 2 months). On price, ads and device support there is nothing between them.

Both are free to download. Model Train Script sells 2 one-off in-app purchases. Z21 mobile asks for nothing beyond the download.

Z21 mobile ships an update every 2 months, Model Train Script every 3 weeks. The most recent releases landed on September 25, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | Z21 mobile | Model Train Script |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (5 ratings)](https://appshunter.io/ios/app/z21-mobile/id533805539/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Monetization | Free | — |
| Size | 27 MB | 46 MB |
| Requires iOS | **6.1.6** | 18.6 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Modelleisenbahn GmbH](https://appshunter.io/developer/533805542) | [Arjan Pragt](https://appshunter.io/developer/1654600131) |

## What reviewers say

### Z21 mobile

[App page](https://appshunter.io/ios/app/z21-mobile/id533805539)

Control your model train layout and locomotives from your iOS device. Manage your locomotive library, program digital components, and operate trains with touch controls. A demo mode is available.

**Highlights:** Connect to Z21 Digital Center, Manage locomotive libraries, Control locomotives (DCC/Motorola), Program digital components, Intuitive graphic interface, Locomotive function control

**In-app purchases:** none


### Model Train Script

[App page](https://appshunter.io/ios/app/model-train-script/id6444422153)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Donation for ModelTrainScript | $9.00 | one-time |
| License | $12.99 | one-time |


## Frequently asked questions

### Is Z21 mobile free?

Z21 mobile is free to download, with no in-app purchases.

### Is Model Train Script free?

Model Train Script is free to download, with in-app purchases available.

### Do Z21 mobile or Model Train Script have ads?

Neither Z21 mobile nor Model Train Script shows ads.

### Which is updated more often, Z21 mobile or Model Train Script?

Z21 mobile ships an update every 2 months, and Model Train Script every 3 weeks. Most recently, Z21 mobile was updated on September 25, 2026 and Model Train Script on September 17, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*