# cMT Viewer vs Sm@rtClient

The clearest difference is review sentiment: cMT Viewer at 43% against Sm@rtClient's 0%. cMT Viewer also leads on update cadence (every 2 months vs every 10 months) and iOS requirement (12.0 vs 18.0). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

cMT Viewer ships an update every 2 months, Sm@rtClient every 10 months. The most recent releases landed on September 23, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | cMT Viewer | Sm@rtClient |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (8 ratings)](https://appshunter.io/ios/app/cmt-viewer/id553431850/reviews)** | — |
| Number of ratings | **8** | — |
| Positive reviews | **42.9% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 10 months |
| Monetization | Free | Free |
| Size | 67 MB | 57 MB |
| Requires iOS | **12.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Weintek Labs., Inc.](https://appshunter.io/developer/553431853) | [Siemens AG](https://appshunter.io/developer/394503271) |

## What reviewers say

### cMT Viewer

[App page](https://appshunter.io/ios/app/cmt-viewer/id553431850)

This application allows for the visual control of HMI hardware and software directly on an iPad. It offers seamless integration with powerful project editor software, enabling intuitive multi-touch gesture operation for data display and trend analysis.

**Highlights:** Multiple iPad clients, Simultaneous operation of multiple HMI servers, Intuitive multi-touch gestures, Fluid and vivid visualization, Account management for access privileges, Hot project switching

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

**In-app purchases:** none


### Sm@rtClient

[App page](https://appshunter.io/ios/app/smrtclient/id874209707)

Remotely operate and monitor industrial HMI systems from your mobile device. Access operator stations, view system layouts, and interact with hardware buttons via touch input. Supports various SIMATIC HMI systems and offers both view-only and coordinated operation modes.

**Highlights:** Remote operation of HMI systems, View-only monitoring mode, Coordinated operation with active remote control, Access to hardware buttons, Automatic HMI panel detection, Browser-based access to Unified Panels, WebView access to PLC webpages

**In-app purchases:** none


## Frequently asked questions

### Is cMT Viewer free?

cMT Viewer is free to download, with no in-app purchases.

### Is Sm@rtClient free?

Sm@rtClient is free to download, with no in-app purchases.

### Do cMT Viewer or Sm@rtClient have ads?

Neither cMT Viewer nor Sm@rtClient shows ads.

### Which is updated more often, cMT Viewer or Sm@rtClient?

cMT Viewer ships an update every 2 months, and Sm@rtClient every 10 months. Most recently, cMT Viewer was updated on September 23, 2026 and Sm@rtClient on October 1, 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.*