# HMI Viewer vs Level One

The clearest difference is price: Level One at Free against HMI Viewer's $0.99. HMI Viewer's advantage is update cadence (every 2 months vs every 5 months) and device support (4 vs 2). On ads, in-app purchases and iOS requirement there is nothing between them.

Level One is free to download; HMI Viewer costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

HMI Viewer ships an update every 2 months, Level One every 5 months. The most recent releases landed on October 24, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | HMI Viewer | Level One |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[5.0 (4 ratings)](https://appshunter.io/ios/app/hmi-viewer/id1261910446/reviews)** | — |
| Number of ratings | **4** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 5 months |
| Monetization | Paid | — |
| Size | 17 MB | 18 MB |
| Requires iOS | **15.0** | 15.6 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Greg Maendel](https://appshunter.io/developer/507756979) | [Zhidu Zhou](https://appshunter.io/developer/1526442781) |

## What reviewers say

### HMI Viewer

[App page](https://appshunter.io/ios/app/hmi-viewer/id1261910446)

This application allows end users to interact with PLC-controlled processes through custom-designed Human Machine Interfaces. Integrators can create and deploy these interfaces securely, enabling seamless control and monitoring of industrial systems.

**Highlights:** View-only HMI interface, Interact with PLC-controlled processes, Secure deployment to end-user devices, Supports major PLC brands, Native application performance

**Features:** Vision Pro support

**In-app purchases:** none


### Level One

[App page](https://appshunter.io/ios/app/level-one-radar-dashboard/id1526442779)

**In-app purchases:** none


## Frequently asked questions

### Is HMI Viewer free?

HMI Viewer costs $0.99, with no in-app purchases.

### Is Level One free?

Level One is free to download, with no in-app purchases.

### Do HMI Viewer or Level One have ads?

Neither HMI Viewer nor Level One shows ads.

### Which is updated more often, HMI Viewer or Level One?

HMI Viewer ships an update every 2 months, and Level One every 5 months. Most recently, HMI Viewer was updated on October 24, 2026 and Level One on October 6, 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.*