# HMI Viewer vs UniFi Access

The clearest difference is price: UniFi Access at Free against HMI Viewer's $0.99. UniFi Access also leads on ratings volume (5.1K vs 4) and update cadence (every 2 weeks vs every 2 months). HMI Viewer's advantage is device support (4 vs 2) and iOS requirement (15.0 vs 17.0). On rating, ads and in-app purchases there is nothing between them.

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

On the App Store both sit at effectively the same score — 5.0 for HMI Viewer against 4.9 for UniFi Access. That said, the two scores are not equally well evidenced: UniFi Access has 5.1K ratings behind it against 4, so its average is the more settled of the two.

HMI Viewer ships an update every 2 months, UniFi Access every 2 weeks. Both last shipped on October 24, 2026.

## The numbers

| Metric | HMI Viewer | UniFi Access |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[5.0 (4 ratings)](https://appshunter.io/ios/app/hmi-viewer/id1261910446/reviews)** | [4.9 (5.1K ratings)](https://appshunter.io/ios/app/unifi-access/id1578429007/reviews) |
| Number of ratings | 4 | **5.1K** |
| Positive reviews | — | 59.8% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Monetization | Paid | **Free** |
| Size | 17 MB | 280 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Greg Maendel](https://appshunter.io/developer/507756979) | [Ubiquiti Inc.](https://appshunter.io/developer/683620863) |

## 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


### UniFi Access

[App page](https://appshunter.io/ios/app/unifi-access/id1578429007)

Manage your entire access control system remotely. Oversee doors, users, readers, and security policies. View real-time activity logs and receive doorbell notifications.

**Highlights:** Manage connected doors and security policies, Oversee user rosters and access methods, Configure reader devices and greeting messages, View real-time access event logs, Receive doorbell notifications, Grant remote access to visitors

**Features:** macOS Compatibility

**In-app purchases:** none

**What reviewers like**

- 👍 Easy to use
- 🚀 Works great
- 🔒 Secure access control
- 💡 Useful features

**What reviewers complain about**

- 🐛 Crashes and bugs
- 🔍 Missing key features
- 💻 Lack of iPad/desktop support
- 🔔 Notification issues

**Reported bugs**

- App crashes on launch
- Notifications not working
- Remote login issues
- Outdated information in app

**Requested features**

- Integrate with Unifi Protect
- Add schedule management in app
- Allow door hold open/timer controls
- Improve camera/intercom integration


## Frequently asked questions

### Is HMI Viewer free?

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

### Is UniFi Access free?

UniFi Access is free to download, with no in-app purchases.

### Which has better reviews, HMI Viewer or UniFi Access?

HMI Viewer is rated higher. HMI Viewer averages 5.0 out of 5 from 4 ratings, while UniFi Access averages 4.9 from 5.1K ratings.

### Do HMI Viewer or UniFi Access have ads?

Neither HMI Viewer nor UniFi Access shows ads.

### Which is updated more often, HMI Viewer or UniFi Access?

HMI Viewer ships an update every 2 months, and UniFi Access every 2 weeks. Most recently, HMI Viewer was updated on October 24, 2026 and UniFi Access on October 24, 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.*