MGS 400 vs BluTest
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
MGS 400
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.
- Bluetooth connectivity
- Device configuration
- Alarm threshold adjustment
- Maintenance testing
- Zero/span calibration
- Intuitive interface
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The Bacharach MGS-400 App allows users to configure, maintain and interface with compatible MGS-400 gas detectors. Once a Bluetooth connection has been established, the app replaces the need for specialty training/tools and makes compliance with safety standards (ASHRAE 15, EN 378) easy and effective. Features include: - Configuration (Rename device, define alarm thresholds, adjust Modbus settings, configure relay behavior and manage analog output settings.) - Maintenance (Test LED/buzzer function, relays, and analog output level.) - Calibration (View sensor type, serial number and “Calibration Due” timer and initiate zero / span calibrations with customizable field calibration certificate.) - Intuitive Interface (View current gas measurement and acknowledge alarm / fault status.)
BluTest
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.
- 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
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Connect to Blü-Test precision test instruments to measure temperature, relative humidity or differential pressure. Immediately log data through smart device communication for convenience and accessibility. The logs are saved on the probe and the app, and can be emailed to your account for use in commissioning, troubleshooting or comparing against your building automation system. Blü-Test is very simple to use. Start the app on your smart phone or tablet and select the probe to view live data from that device. Multiple data points can be logged, graphed or emailed. Select which probe logs to download to your device, link logs to sites and locations, and use a thorough set of calculators to make using Blu-Test easier than ever before.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | MGS 400 | BluTest |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | 4.0 (2 ratings) |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 1 | 2 — better |
| Update frequency | Every 17 months | Every 5 weeks — better |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | Ad-supported | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 14.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 16 MB | 19 MB |
| Age rating | 4+ | 4+ |
| Developer | MSA - The Safety Company | Building Automation Products, Inc |
Customer experience
MGS 400
BluTest
In-app purchases
MGS 400
No in-app purchases
BluTest
No in-app purchases









