# Z21Updater vs Model Train Script

The clearest difference is in-app purchases: Z21Updater at none against Model Train Script's 2. Z21Updater also leads on iOS requirement (13.4 vs 18.6). Model Train Script's advantage is update cadence (every 3 weeks vs every 28 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. Z21Updater asks for nothing beyond the download.

Z21Updater ships an update every 28 months, Model Train Script every 3 weeks. The most recent releases landed on August 31, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | Z21Updater | Model Train Script |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/z21updater/id1463533460/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 28 months | **Every 3 weeks** |
| Monetization | Free | — |
| Size | 29 MB | 46 MB |
| Requires iOS | **13.4** | 18.6 |
| Devices | **iPhone, iPad, 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

### Z21Updater

[App page](https://appshunter.io/ios/app/z21updater/id1463533460)

Easily update your Z21, z21, z21start, and smartRail devices. The app automatically detects connected hardware and fetches the latest firmware directly from the server when online, simplifying the update process.

**Highlights:** Automatic device recognition, Direct server updates, Simple and functional update process, Supports Z21, z21, z21start, smartRail

**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 Z21Updater free?

Z21Updater 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 Z21Updater or Model Train Script have ads?

Neither Z21Updater nor Model Train Script shows ads.

### Which is updated more often, Z21Updater or Model Train Script?

Z21Updater ships an update every 28 months, and Model Train Script every 3 weeks. Most recently, Z21Updater was updated on August 31, 2026 and Model Train Script on September 17, 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.*