# MGS 400 vs Necool

The clearest difference is ads: Necool at none against MGS 400's shown. Necool also leads on update cadence (every 10 days vs every 17 months). On price, in-app purchases, device support and iOS requirement 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, Necool every 10 days. The most recent releases landed on October 14, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | MGS 400 | Necool |
| --- | --- | --- |
| 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 | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 17 months | **Every 10 days** |
| Monetization | Ad-supported | — |
| Size | 16 MB | 92 MB |
| Requires iOS | **14.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [MSA - The Safety Company](https://appshunter.io/developer/482957840) | [Xuzhou Yunkong Electrical Technology Co., LTD](https://appshunter.io/developer/1883904580) |

## 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


### Necool

[App page](https://appshunter.io/ios/app/necool/id6760327287)

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

**In-app purchases:** none


## Frequently asked questions

### Is MGS 400 free?

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

### Is Necool free?

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

### Do MGS 400 or Necool have ads?

MGS 400 shows ads; Necool does not.

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

MGS 400 ships an update every 17 months, and Necool every 10 days. Most recently, MGS 400 was updated on October 14, 2026 and Necool 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.*