# Operations Center Mobile vs HMI Viewer

The clearest difference is price: Operations Center Mobile at Free against HMI Viewer's $0.99. Operations Center Mobile also leads on ratings volume (6.2K vs 4) and update cadence (every 11 days vs every 2 months). HMI Viewer's advantage is rating (5.0 vs 4.6) and device support (4 vs 2). On ads and in-app purchases there is nothing between them.

Operations Center Mobile 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 holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: Operations Center Mobile has 6.2K ratings behind it against 4, so its average is the more settled of the two.

Operations Center Mobile ships an update every 11 days, HMI Viewer every 2 months. The most recent releases landed on October 29, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Operations Center Mobile | HMI Viewer |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | [4.6 (6.2K ratings)](https://appshunter.io/ios/app/operations-center-mobile/id1104383066/reviews) | **[5.0 (4 ratings)](https://appshunter.io/ios/app/hmi-viewer/id1261910446/reviews)** |
| Number of ratings | **6.2K** | 4 |
| Positive reviews | 47.4% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 11 days** | Every 2 months |
| Monetization | **Free** | Paid |
| Size | 241 MB | 17 MB |
| Requires iOS | 18.5 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [John Deere](https://appshunter.io/developer/411445733) | [Greg Maendel](https://appshunter.io/developer/507756979) |

## What reviewers say

### Operations Center Mobile

[App page](https://appshunter.io/ios/app/operations-center-mobile/id1104383066)

Manage farm or construction equipment and operations with this powerful app. Get actionable insights for optimizing logistics and productivity, making data-driven decisions. Monitor equipment and operations in near-real-time for enhanced control.

**Highlights:** Machine location and performance monitoring, Security and health diagnostic alerts, Seeding, Application, Harvest, and Tillage data analysis, Machine location history tracking, Field boundary visualization, Driving directions to machines/fields, Remote Display Access (RDA)

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

**In-app purchases:** none

**What reviewers like**

- 👍 Good functionality
- 👍 Useful for managing farm data
- 👍 Helpful for tracking machinery
- 👍 Easy to use
- 👍 Provides valuable updates

**What reviewers complain about**

- 🐛 Crashes frequently
- 🐛 Glitchy and unreliable
- 🐛 Slow and laggy performance
- 🐛 Difficult to navigate
- 🐛 Lacks user-friendly features

**Reported bugs**

- Incompatible with latest iOS updates
- Fails to load new data and coverage maps
- Crashes every 40-50 seconds
- Loses equipment and field data
- Repeatedly asks for usage data permission

**Requested features**

- Allow customization of HID module display
- Integrate with financial statements
- Add wind, temperature, and weather data tracking
- Enable marking and managing of field obstacles
- Improve map coverage and visibility


### 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


## Frequently asked questions

### Is Operations Center Mobile free?

Operations Center Mobile is free to download, with no in-app purchases.

### Is HMI Viewer free?

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

### Which has better reviews, Operations Center Mobile or HMI Viewer?

HMI Viewer is rated higher. Operations Center Mobile averages 4.6 out of 5 from 6.2K ratings, while HMI Viewer averages 5.0 from 4 ratings.

### Do Operations Center Mobile or HMI Viewer have ads?

Neither Operations Center Mobile nor HMI Viewer shows ads.

### Which is updated more often, Operations Center Mobile or HMI Viewer?

Operations Center Mobile ships an update every 11 days, and HMI Viewer every 2 months. Most recently, Operations Center Mobile was updated on October 29, 2026 and HMI Viewer on October 31, 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.*