# Bad Elf GPS vs MGS 400

The clearest difference is review sentiment: MGS 400 at 100% against Bad Elf GPS's 49%. MGS 400 also leads on rating (5.0 vs 4.3). Bad Elf GPS's advantage is ads (none vs shown) and update cadence (every 2 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 holds the better App Store score, 5.0 against 4.3. That said, the two scores are not equally well evidenced: Bad Elf GPS has 20 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 49% of Bad Elf GPS's written reviews are positive against 100% of MGS 400's.

Bad Elf GPS ships an update every 2 months, MGS 400 every 17 months. The most recent releases landed on November 1, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | Bad Elf GPS | MGS 400 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.3 (20 ratings)](https://appshunter.io/ios/app/bad-elf-gps/id391764718/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/mgs-400/id1441402354/reviews)** |
| Number of ratings | **20** | 1 |
| Positive reviews | 49.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Every 2 months** | Every 17 months |
| Monetization | **Free** | Ad-supported |
| Size | 82 MB | 16 MB |
| Requires iOS | **9.0** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Bad Elf, LLC.](https://appshunter.io/developer/391764721) | [MSA - The Safety Company](https://appshunter.io/developer/482957840) |

## What reviewers say

### Bad Elf GPS

[App page](https://appshunter.io/ios/app/bad-elf-gps/id391764718)

Manage your Bad Elf GPS accessory. Check hardware health, view GPS data, transfer trip logs, and update firmware. Enhances location services for iOS devices.

**Highlights:** Check hardware health, View GPS data, Transfer trip logs, Install firmware updates, Enhance iOS location services

**In-app purchases:** none

**What reviewers like**

- 🎯 Accurate GPS positioning without cellular dependency
- ⚡ Fast satellite acquisition and lock
- 🔧 Reliable hardware that lasts years
- 📱 Works seamlessly with compatible mapping apps
- 🛰️ Excellent satellite visibility display

**What reviewers complain about**

- 🐛 Frequent app crashes across iOS versions
- 📶 Stale data display in app interface
- 🔄 Unreliable Bluetooth connectivity
- ⚠️ No offline base maps in app
- 🗺️ Limited map functionality without third-party apps

**Reported bugs**

- App crashes on startup with iOS 8.3+
- Firmware update hangs indefinitely
- Stale cached data prevents control functionality
- Track logging fails to activate despite appearing to work
- Barometer readings not displayed correctly

**Requested features**

- Offline base map display
- UTM coordinate display option
- Improved Bluetooth reliability
- Modern USB-C connector
- Satellite status information in main app view


### 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 Bad Elf GPS free?

Bad Elf GPS 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, Bad Elf GPS or MGS 400?

MGS 400 is rated higher. Bad Elf GPS averages 4.3 out of 5 from 20 ratings, while MGS 400 averages 5.0 from 1 ratings.

### Do Bad Elf GPS or MGS 400 have ads?

MGS 400 shows ads; Bad Elf GPS does not.

### Which is updated more often, Bad Elf GPS or MGS 400?

Bad Elf GPS ships an update every 2 months, and MGS 400 every 17 months. Most recently, Bad Elf GPS was updated on November 1, 2026 and MGS 400 on November 2, 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.*