# CrowdMag vs RF Pro

The clearest difference is review sentiment: RF Pro at 100% against CrowdMag's 53%. RF Pro also leads on rating (5.0 vs 4.3). CrowdMag's advantage is update cadence (every 2 months vs every 7 months) and ratings volume (25 vs 5). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

RF Pro holds the better App Store score, 5.0 against 4.3. That said, the two scores are not equally well evidenced: CrowdMag has 25 ratings behind it against 5, so its average is the more settled of the two. Written reviews point the same way: 53% of CrowdMag's written reviews are positive against 100% of RF Pro's.

CrowdMag ships an update every 2 months, RF Pro every 7 months. The most recent releases landed on October 26, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | CrowdMag | RF Pro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.3 (25 ratings)](https://appshunter.io/ios/app/crowdmag/id910578825/reviews) | **[5.0 (5 ratings)](https://appshunter.io/ios/app/rf-pro-faraday-bag-tester/id6744664740/reviews)** |
| Number of ratings | **25** | 5 |
| Positive reviews | 52.9% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 7 months |
| Monetization | Free | Free |
| Size | 18 MB | 7 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [University of Colorado Boulder](https://appshunter.io/developer/972210292) | [OffGrid](https://appshunter.io/developer/1808780483) |

## What reviewers say

### CrowdMag

[App page](https://appshunter.io/ios/app/crowdmag/id910578825)

This app allows users to measure and contribute to scientific research on Earth's magnetic field using their smartphone. It offers features for recording magnetic data during various activities, including flights, and provides tools for data visualization and analysis.

**Highlights:** Measure magnetic field data, Contribute to scientific research, Record data during flights, Visualize data on maps and graphs, Magnetic calculator with WMM2020, Live magnetic compass, Export data via email/Google Drive

**Features:** macOS Compatibility

**In-app purchases:** none


### RF Pro

[App page](https://appshunter.io/ios/app/rf-pro-faraday-bag-tester/id6744664740)

This utility app verifies the effectiveness of Faraday bags by detecting signal leaks from your device. It helps ensure your device is isolated from external communication networks for privacy, security, or forensic purposes.

**Highlights:** Comprehensive signal testing (WiFi, Cellular, GPS, Bluetooth), Real-time signal strength analysis, Clear visual indicators and graphs, Step-by-step testing guidance, Quick retest function

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is CrowdMag free?

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

### Is RF Pro free?

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

### Which has better reviews, CrowdMag or RF Pro?

RF Pro is rated higher. CrowdMag averages 4.3 out of 5 from 25 ratings, while RF Pro averages 5.0 from 5 ratings.

### Do CrowdMag or RF Pro have ads?

Neither CrowdMag nor RF Pro shows ads.

### Which is updated more often, CrowdMag or RF Pro?

CrowdMag ships an update every 2 months, and RF Pro every 7 months. Most recently, CrowdMag was updated on October 26, 2026 and RF Pro on October 24, 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.*