# GP NOVA gas detector vs EMF Detector

The clearest difference is in-app purchases: GP NOVA gas detector at none against EMF Detector's 3. EMF Detector's advantage is update cadence (every 2 weeks vs every 27 months). On price, ads, device support and iOS requirement there is nothing between them.

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

GP NOVA gas detector ships an update every 27 months, EMF Detector every 2 weeks. The most recent releases landed on September 17, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | GP NOVA gas detector | EMF Detector |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.3 (319 ratings)](https://appshunter.io/ios/app/emf-detector-radiation-reader/id6572300713/reviews)** |
| Number of ratings | — | **319** |
| Positive reviews | — | 25.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 27 months | **Every 2 weeks** |
| Monetization | — | Free with in-app purchases |
| Size | 65 MB | 11 MB |
| Requires iOS | 14.2 | **13.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Geopal](https://appshunter.io/developer/1573577681) | [新雨 李](https://appshunter.io/developer/1559932632) |

## What reviewers say

### GP NOVA gas detector

[App page](https://appshunter.io/ios/app/gp-nova-gas-detector/id1573577679)

**Features:** macOS Compatibility

**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 GP NOVA gas detector free?

GP NOVA gas detector is free to download, with no in-app purchases.

### Is EMF Detector free?

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

### Do GP NOVA gas detector or EMF Detector have ads?

Neither GP NOVA gas detector nor EMF Detector shows ads.

### Which is updated more often, GP NOVA gas detector or EMF Detector?

GP NOVA gas detector ships an update every 27 months, and EMF Detector every 2 weeks. Most recently, GP NOVA gas detector was updated on September 17, 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.*