# Z21 mobile HD

> Digital model train control center for iOS devices. (iPhone/iPad app by Modelleisenbahn GmbH.)

- Source: https://appshunter.io/ios/app/z21-mobile-hd/id535465008 (this page in markdown: same URL + `.md`)
- Developer: [Modelleisenbahn GmbH](https://appshunter.io/developer/533805542)
- Category: Lifestyle, Entertainment
- Price: Free with in-app purchases
- Rating: 5.00/5 from 3 App Store ratings · 7 written reviews indexed
- Age rating: 4+
- Requires: iOS 5.1.1 · 46 MB
- Languages: American English, Czech, French (France), German (Germany), Japanese, Chinese (Simplified, China)
- Released: 2012-07-18
- Data updated: 2026-06-07
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/z21-mobile-hd/id535465008/reviews.md

## What is Z21 mobile HD?

Use this app to connect to a Z21 Digital Center. A demo mode is available.
With this app you can manage locomotive libraries, locomotives and locomotive functions, program digital components – and of course control all locomotives with DCC- or Motorola-decoder, as easy and convenient as is only possible with touch-technology.
The digital switchboard Z21 connects your model train unit and your digital locomotives with your iOS device via WLAN. This way you can control the operation on your train layout easily and conveniently from your mobile device. 

Model train control was never this easy and convenient: With one swipe of your hand you can scroll to your model of choice in the locomotive library. A slight touch on the headlight symbol and the front and backlights go on. A second touch, this time on the speaker symbol, and the locomotive makes a sound. Drag your finger over the speed indicator and the train accelerates. 

The further highlights of the Z21-Mobile-App
 • Control your entire layout with an intuitive, graphic interface and have easy access to the entire scope of functions of your digital locomotives.
 • Manage your entire locomotive-library in just one application, including individual locomotive images for an ideal overview.
 • Control the digital functions of your locomotives with intuitive function symbols instead of complicated key combinations.

## Key features

- Connect to Z21 Digital Center
- Manage locomotive libraries
- Control locomotives with DCC/Motorola decoders
- Program digital components
- Intuitive graphic interface
- Assign custom locomotive images

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| BR52 | $10.99 | one-time |
| RH 109.13 | $10.99 | one-time |
| BR103 | $10.99 | one-time |


## Recent user reviews (7 of 7)

All indexed reviews: https://appshunter.io/ios/app/z21-mobile-hd/id535465008/reviews.md

### 5/5 — Excellent

*2018-03-08, version 2.3.20*

An excellent app that just works as it should every single time. I have been using this app and previous versions for 5 years and never had any problems.

Coupled with the Z21 system I genuinely believe this is the best DCC control system on the market.

### 1/5 — Needs Work

*2017-12-10, version 2.3.18*

Useless for layout control as it crashes if you try and change the configuration of a control.

### 5/5 — z21 app 5star

*2017-02-26, version 2.3.13*

An excellent app for all controls on your dcc layout

### 5/5 — A great controller!

*2016-12-29*

This is by far the best system I have used. My jaw dropped every time I found more features to implement.

### 5/5 — Very good

*2013-06-29, version 2.0.1*

Very good system, the future for model railway control.

Some suggestions for future updates:
 It would be great to be able to copy a locos 'function mapping' to other locos within the app. i.e. make a function template for all your locos. Most of my sound locos have the same functions mapped to the same keys, however in this app I have to laboriously configure each loco separately.

I can't find an explanation of what the 'traction settings' do, every time I try to create a train ( multi head) it says I have to configure the 'traction settings' for the loco.

### 2/5 — Seems like a beta

*2013-01-27, version 1.1.2*

Works ok, until you try to move between functions. Ipad 3 struggles and locks up for a couple of minutes. Bad news if you have to stop a loco urgently.

Needs to be FAR better

### 2/5 — Oops!

*2012-10-23, version 1.1*

Seems to have a few bugs in it - won't send voltage to track; won't programme decoders or drive locomotives.   I also have iPhone version 1.08 and that works perfectly.

Having spent £300 on controller unit, I hope that a corrected version of programme for iPad makes an appearance soon

## Frequently asked questions about Z21 mobile HD

### What devices does Z21 mobile HD support?

Z21 mobile HD is designed for iPads. It was released on July 18, 2012, and its latest version is 2.3.21, updated on March 21, 2018.

### Is Z21 mobile HD free to use?

Yes, Z21 mobile HD is available for free. The app does not contain advertisements.

### What is the age rating for Z21 mobile HD?

Z21 mobile HD has an age rating of 4+. This indicates it is suitable for young children and general audiences.

### How often is Z21 mobile HD updated?

The app was last updated on March 21, 2018, with version 2.3.21. While updates have not been frequent recently, it remains functional for its purpose.

### Can I try Z21 mobile HD without a Z21 Digital Center?

Yes, a demo mode is available within Z21 mobile HD. This allows you to explore its features and interface before connecting to your physical model train setup.

### What kind of control does Z21 mobile HD offer for locomotives?

Z21 mobile HD allows for precise control of locomotives using DCC or Motorola decoders. You can manage locomotive functions, lights, and sounds, and adjust speed via touch gestures.

### How does Z21 mobile HD help manage locomotives?

The app lets you create and manage a comprehensive locomotive library. You can store individual locomotive images for easy identification and access all their functions intuitively.

### What is the user sentiment for Z21 mobile HD?

Based on the provided data, Z21 mobile HD has a perfect rating of 5.0 stars from 3 ratings, suggesting very positive user sentiment among its current users.

## Version history (last 5 releases)

### 2.3.21 — 2018-03-21

This app has been updated by Apple to display the Apple Watch app icon.

- Bugfix for repeated export via share

### 2.3.20 — 2018-02-19

- Added export function so you can easily copy layouts to the new Z21 app

### 2.3.19 — 2017-12-13

- Bug fixes Track Control Settings and creating new wagon

### 2.3.18 — 2017-11-20

Toolbar buttons are visible in vehicle management on iOS 11
Toolbar buttons are visible in control station on iOS 11

### 2.3.17 — 2017-09-28

- Bug Fix: older iOS Versions open Railed Vehicles Settings
- Bug Fix: crash open camera

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## More apps by Modelleisenbahn GmbH

- [Z21 mobile](https://appshunter.io/ios/app/z21-mobile/id533805539)
- [Roco NEXT Generation](https://appshunter.io/ios/app/roco-next-generation/id913873900)
- [Z21](https://appshunter.io/ios/app/z21/id1114706450)
- [Z21Updater](https://appshunter.io/ios/app/z21updater/id1463533460)
- [RocoAR](https://appshunter.io/ios/app/rocoar/id1529108412)

All apps by Modelleisenbahn GmbH: https://appshunter.io/developer/533805542

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-07.*