# KoolCode vs MGS 400

KoolCode and MGS 400 both sit at 5.0 stars, but that hides the real split: 100% of MGS 400's written reviews are positive against 50% of KoolCode's. KoolCode's advantage is ads (none vs shown) and monetization model (free vs ad-supported). On price, rating, ratings volume 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 — 5.0 for KoolCode against 5.0 for MGS 400. Both are backed by a comparable volume of ratings — 1 and 1 respectively. Written reviews are what separate them: 50% of KoolCode's written reviews are positive against 100% of MGS 400's.

KoolCode ships an update every 8 months, MGS 400 every 17 months. The most recent releases landed on September 14, 2026 and June 9, 2026 respectively.

## The numbers

| Metric | KoolCode | MGS 400 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/koolcode/id563222728/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/mgs-400/id1441402354/reviews) |
| Number of ratings | 1 | 1 |
| Positive reviews | 50.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Every 8 months** | Every 17 months |
| Monetization | **Free** | Ad-supported |
| Size | 31 MB | 16 MB |
| Requires iOS | 15.1 | **14.0** |
| Devices | iPhone, 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

### KoolCode

[App page](https://appshunter.io/ios/app/koolcode/id563222728)

This utility app provides quick, offline access to alarm and parameter codes for refrigeration controllers. It helps service technicians and engineers easily look up information without needing manuals or laptops.

**Highlights:** On-the-spot ADAP-KOOL controller information, Alarm status and parameter descriptions, Offline code lookup tool, Quick code translation, Hierarchical controller selection

**Features:** macOS Compatibility

**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 KoolCode free?

KoolCode 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, KoolCode or MGS 400?

KoolCode and MGS 400 are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.

### Do KoolCode or MGS 400 have ads?

MGS 400 shows ads; KoolCode does not.

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

KoolCode ships an update every 8 months, and MGS 400 every 17 months. Most recently, KoolCode was updated on September 14, 2026 and MGS 400 on June 9, 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.*