# SiteService vs MGS 400

SiteService and MGS 400 both sit at 4.9 stars, but that hides the real split: 100% of MGS 400's written reviews are positive against 30% of SiteService's. SiteService's advantage is ads (none vs shown) and monetization model (free vs ad-supported). On price, rating, update cadence and in-app purchases there is nothing between them.

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

On the App Store both sit at effectively the same score — 4.9 for SiteService against 5.0 for MGS 400. That said, the two scores are not equally well evidenced: SiteService has 7 ratings behind it against 1, so its average is the more settled of the two. Written reviews are what separate them: 30% of SiteService's written reviews are positive against 100% of MGS 400's.

SiteService ships an update every 32 months, MGS 400 every 17 months. The most recent releases landed on November 6, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | SiteService | MGS 400 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.9 (7 ratings)](https://appshunter.io/ios/app/siteservice/id820996000/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/mgs-400/id1441402354/reviews)** |
| Number of ratings | **7** | 1 |
| Positive reviews | 30.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 32 months | **Every 17 months** |
| Monetization | **Free** | Ad-supported |
| Size | 73 MB | 16 MB |
| Requires iOS | **8.0** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Danfoss A/S](https://appshunter.io/developer/423984644) | [MSA - The Safety Company](https://appshunter.io/developer/482957840) |

## What reviewers say

### SiteService

[App page](https://appshunter.io/ios/app/siteservice/id820996000)

This application allows service technicians to remotely connect to Danfoss control systems. It provides a live view of plant status, alarms, historical data, and device settings, simplifying common service tasks with an intuitive interface.

**Highlights:** Remote connection to Danfoss control systems, Live plant status visualization, Alarm management and history, Device settings and parameter access, Manual control of systems, Address book for site connections

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

**In-app purchases:** none


### MGS 400

[App page](https://appshunter.io/ios/app/mgs-400/id1441402354)

This app connects to compatible gas detectors via Bluetooth, simplifying configuration, maintenance, and calibration. It replaces the need for specialized tools and training, ensuring compliance with safety standards.

**Highlights:** Bluetooth connectivity, Device configuration, Alarm threshold adjustment, Maintenance testing, Zero/span calibration, Intuitive interface

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is SiteService free?

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

### Is MGS 400 free?

MGS 400 is free to download, with no in-app purchases.

### Which has better reviews, SiteService or MGS 400?

MGS 400 is rated higher. SiteService averages 4.9 out of 5 from 7 ratings, while MGS 400 averages 5.0 from 1 ratings.

### Do SiteService or MGS 400 have ads?

MGS 400 shows ads; SiteService does not.

### Which is updated more often, SiteService or MGS 400?

SiteService ships an update every 32 months, and MGS 400 every 17 months. Most recently, SiteService was updated on November 6, 2026 and MGS 400 on November 2, 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.*