# cMT Viewer vs SMART Keypad

The clearest difference is review sentiment: cMT Viewer at 43% against SMART Keypad's 20%. cMT Viewer also leads on update cadence (every 2 months vs every 8 months) and iOS requirement (12.0 vs 14.2). 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, SMART Keypad every 8 months. The most recent releases landed on October 9, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | cMT Viewer | SMART Keypad |
| --- | --- | --- |
| 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** | 20.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 8 months |
| Monetization | Free | Free |
| Size | 67 MB | 90 MB |
| Requires iOS | **12.0** | 14.2 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Weintek Labs., Inc.](https://appshunter.io/developer/553431853) | [Lenze SE](https://appshunter.io/developer/570667635) |

## 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


### SMART Keypad

[App page](https://appshunter.io/ios/app/smart-keypad/id1292192378)

This application enables the diagnosis and configuration of a Lenze i500 inverter via a WLAN module. It offers features for connecting, diagnosing device status, performing basic commissioning, managing parameters, and controlling the inverter manually. Users can also transfer parameter sets and reset errors.

**Highlights:** Inverter diagnosis and parameterization, Device connection and search, Parameter list and management, Manual inverter control, Parameter set transfer, Error reset and device reset

**In-app purchases:** none


## Frequently asked questions

### Is cMT Viewer free?

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

### Is SMART Keypad free?

SMART Keypad is free to download, with no in-app purchases.

### Do cMT Viewer or SMART Keypad have ads?

Neither cMT Viewer nor SMART Keypad shows ads.

### Which is updated more often, cMT Viewer or SMART Keypad?

cMT Viewer ships an update every 2 months, and SMART Keypad every 8 months. Most recently, cMT Viewer was updated on October 9, 2026 and SMART Keypad on October 7, 2026.

---

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