# MGS 400 vs BluTest

The clearest difference is rating: MGS 400 at 5.0 against BluTest's 4.0. BluTest's advantage is ads (none vs shown) and update cadence (every 5 weeks vs every 17 months). On price, ratings volume, in-app purchases and device support there is nothing between them.

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

MGS 400 holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 1 and 2 respectively.

MGS 400 ships an update every 17 months, BluTest every 5 weeks. The most recent releases landed on October 14, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | MGS 400 | BluTest |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/mgs-400/id1441402354/reviews)** | [4.0 (2 ratings)](https://appshunter.io/ios/app/blutest/id1468301498/reviews) |
| Number of ratings | 1 | **2** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 17 months | **Every 5 weeks** |
| Monetization | Ad-supported | **Free** |
| Size | 16 MB | 19 MB |
| Requires iOS | 14.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [MSA - The Safety Company](https://appshunter.io/developer/482957840) | [Building Automation Products, Inc](https://appshunter.io/developer/1442208652) |

## What reviewers say

### 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


### BluTest

[App page](https://appshunter.io/ios/app/blutest/id1468301498)

Connect to precision test instruments to measure temperature, humidity, and pressure. Log data directly from smart devices for easy access and sharing. The app simplifies commissioning, troubleshooting, and building automation system comparisons.

**Highlights:** Connect to Blü-Test sensor probes, Measure temperature, humidity, and pressure, Log data directly to smart devices, Save logs on probe and app, Email logs for reporting, Graph and compare data points

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is MGS 400 free?

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

### Is BluTest free?

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

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

MGS 400 is rated higher. MGS 400 averages 5.0 out of 5 from 1 ratings, while BluTest averages 4.0 from 2 ratings.

### Do MGS 400 or BluTest have ads?

MGS 400 shows ads; BluTest does not.

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

MGS 400 ships an update every 17 months, and BluTest every 5 weeks. Most recently, MGS 400 was updated on October 14, 2026 and BluTest on October 15, 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.*