# GMCMap vs EMF Detector

The clearest difference is review sentiment: GMCMap at 70% against EMF Detector's 25%. GMCMap also leads on in-app purchases (none vs 3). EMF Detector's advantage is update cadence (every 2 weeks vs every 5 months) and rating (4.3 vs 4.1). On price, ads and device support there is nothing between them.

Both are free to download. EMF Detector sells 2 in-app purchases, starting at $4.99 per month. GMCMap asks for nothing beyond the download.

EMF Detector holds the better App Store score, 4.3 against 4.1. That said, the two scores are not equally well evidenced: EMF Detector has 319 ratings behind it against 19, so its average is the more settled of the two. Written reviews complicate that: 70% of GMCMap's written reviews are positive against 25% of EMF Detector's, so the app with the better star average is not the one people write more warmly about.

GMCMap ships an update every 5 months, EMF Detector every 2 weeks. The most recent releases landed on September 22, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | GMCMap | EMF Detector |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.1 (19 ratings)](https://appshunter.io/ios/app/gmcmap/id6459882680/reviews) | **[4.3 (319 ratings)](https://appshunter.io/ios/app/emf-detector-radiation-reader/id6572300713/reviews)** |
| Number of ratings | 19 | **319** |
| Positive reviews | **70.0% of reviews** | 25.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 2 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 27 MB | 11 MB |
| Requires iOS | 15.1 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [GQ Electronics LLC](https://appshunter.io/developer/1379843069) | [新雨 李](https://appshunter.io/developer/1559932632) |

## What reviewers say

### GMCMap

[App page](https://appshunter.io/ios/app/gmcmap/id6459882680)

This app provides a real-time radiation map of the world, displaying current radiation levels from monitoring stations globally. It features an interactive map, historical data, and trend analysis for comprehensive environmental vigilance.

**Highlights:** Real-time radiation data, Global coverage map, Interactive map interface, Historical data and trends, Mobile convenience

**In-app purchases:** none


### EMF Detector

[App page](https://appshunter.io/ios/app/emf-detector-radiation-reader/id6572300713)

Transform your iPhone into an EMF detector to monitor electromagnetic fields. Identify radiation levels in various environments to assess safety at home, work, or in public spaces. Gain insights to make informed decisions about your surroundings.

**Highlights:** EMF monitoring, Electromagnetic field detection, Radiation level measurement, Environmental safety assessment, Real-time EMF readings

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| unlimited features | $4.99 | per month |
| unlimited features | $14.99 | one-time |


## Frequently asked questions

### Is GMCMap free?

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

### Is EMF Detector free?

EMF Detector is free to download, with in-app purchases available.

### Which has better reviews, GMCMap or EMF Detector?

EMF Detector is rated higher. GMCMap averages 4.1 out of 5 from 19 ratings, while EMF Detector averages 4.3 from 319 ratings.

### Do GMCMap or EMF Detector have ads?

Neither GMCMap nor EMF Detector shows ads.

### Which is updated more often, GMCMap or EMF Detector?

GMCMap ships an update every 5 months, and EMF Detector every 2 weeks. Most recently, GMCMap was updated on September 22, 2026 and EMF Detector on September 21, 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.*