# Tracer vs EMF Detector

The clearest difference is rating: EMF Detector at 4.4 against Tracer's 3.7. EMF Detector also leads on ratings volume (338 vs 3). Tracer's advantage is in-app purchases (none vs 3). On price, update cadence, 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. Tracer asks for nothing beyond the download.

EMF Detector holds the better App Store score, 4.4 against 3.7. That said, the two scores are not equally well evidenced: EMF Detector has 338 ratings behind it against 3, so its average is the more settled of the two.

Tracer ships an update fortnightly, EMF Detector every 2 weeks. The most recent releases landed on October 21, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | Tracer | EMF Detector |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.7 (3 ratings)](https://appshunter.io/ios/app/tracer-gas-detector/id6473568941/reviews) | **[4.4 (338 ratings)](https://appshunter.io/ios/app/emf-detector-radiation-reader/id6572300713/reviews)** |
| Number of ratings | 3 | **338** |
| Positive reviews | — | 25.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 2 weeks |
| Monetization | **Ad-supported** | Free with in-app purchases |
| Size | 37 MB | 11 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [ReFleX Wireless Inc.](https://appshunter.io/developer/666581212) | [新雨 李](https://appshunter.io/developer/1559932632) |

## What reviewers say

### Tracer

[App page](https://appshunter.io/ios/app/tracer-gas-detector/id6473568941)

This app works with a smartphone-powered USB device to detect various gas leaks like methane and formaldehyde. It provides real-time monitoring and alerts to enhance safety at home or work. Pinpoint emission sources effortlessly for peace of mind.

**Highlights:** Detects methane, propane, formaldehyde, hydrogen, Smartphone-powered via USB, Real-time monitoring and alerts, Pinpoints gas emission sources, Enhances safety and peace of mind

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

**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 Tracer free?

Tracer 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, Tracer or EMF Detector?

EMF Detector is rated higher. Tracer averages 3.7 out of 5 from 3 ratings, while EMF Detector averages 4.4 from 338 ratings.

### Do Tracer or EMF Detector have ads?

Neither Tracer nor EMF Detector shows ads.

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

Tracer ships an update fortnightly, and EMF Detector every 2 weeks. Most recently, Tracer was updated on October 21, 2026 and EMF Detector on October 22, 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.*