# MGS 400 vs RILEVA

The clearest difference is review sentiment: MGS 400 at 100% against RILEVA's 0%. RILEVA's advantage is ads (none vs shown) and update cadence (every 7 months vs every 17 months). On price, 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 ships an update every 17 months, RILEVA every 7 months. The most recent releases landed on October 14, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | MGS 400 | RILEVA |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/mgs-400/id1441402354/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | **100.0% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 17 months | **Every 7 months** |
| Monetization | Ad-supported | **Free** |
| Size | 16 MB | 19 MB |
| Requires iOS | 14.0 | **10.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [MSA - The Safety Company](https://appshunter.io/developer/482957840) | [CAREL INDUSTRIES S.p.A.](https://appshunter.io/developer/1797037609) |

## 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


### RILEVA

[App page](https://appshunter.io/ios/app/rileva/id1497081482)

This utility app simplifies interaction with CAREL GLD series gas detectors using Bluetooth. It streamlines configuration, maintenance, and calibration processes, making daily checks more user-friendly and efficient. The app allows for easy testing, calibration initiation, and viewing of gas measurements and alarm statuses directly from a smartphone.

**Highlights:** Bluetooth connectivity, Device configuration, Alarm threshold definition, Maintenance testing, Calibration initiation, Real-time measurement viewing, Alarm status acknowledgement

**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 RILEVA free?

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

### Do MGS 400 or RILEVA have ads?

MGS 400 shows ads; RILEVA does not.

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

MGS 400 ships an update every 17 months, and RILEVA every 7 months. Most recently, MGS 400 was updated on October 14, 2026 and RILEVA on October 13, 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.*