# RadioactivityCounter vs Magnetometer ∞

The clearest difference is price: Magnetometer ∞ at Free against RadioactivityCounter's $4.99. Magnetometer ∞ also leads on rating (4.4 vs 3.1) and update cadence (every 2 weeks vs every 15 months). RadioactivityCounter's advantage is in-app purchases (none vs 2) and ads (none vs shown). On device support there is nothing between them.

Magnetometer ∞ is free to download; RadioactivityCounter costs $4.99 up front. Magnetometer ∞ sells 2 in-app purchases, starting at $1.99 per 7 days. RadioactivityCounter asks for nothing beyond the download.

Magnetometer ∞ holds the better App Store score, 4.4 against 3.1. That said, the two scores are not equally well evidenced: Magnetometer ∞ has 59 ratings behind it against 10, so its average is the more settled of the two.

RadioactivityCounter ships an update every 15 months, Magnetometer ∞ every 2 weeks. The most recent releases landed on November 6, 2026 and November 8, 2026 respectively.

## The numbers

| Metric | RadioactivityCounter | Magnetometer ∞ |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | [3.1 (10 ratings)](https://appshunter.io/ios/app/radioactivitycounter/id464004677/reviews) | **[4.4 (59 ratings)](https://appshunter.io/ios/app/magnetometer/id6753061844/reviews)** |
| Number of ratings | 10 | **59** |
| Positive reviews | 68.4% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 15 months | **Every 2 weeks** |
| Monetization | Paid | **Free with in-app purchases** |
| Best chart rank | **#184** | — |
| Size | 11 MB | 16 MB |
| Requires iOS | **8.0** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Dipl.-Ing. Rolf-Dieter Klein](https://appshunter.io/developer/309148367) | [Fawkes Wei](https://appshunter.io/developer/432767536) |

## What reviewers say

### RadioactivityCounter

[App page](https://appshunter.io/ios/app/radioactivitycounter/id464004677)

**Currently charting:** #184 Top Paid · Utilities (US App Store)

Transform your phone into a functional radioactivity counter. Measure gamma and some beta radiation using your device's camera sensor after calibration. Useful for personal use and experimentation with radiation sources.

**Highlights:** Real radioactivity counter functionality, Converts phone into Geiger Müller Counter, Measures gamma and some beta radiation, Requires calibration for accuracy, Expert setup for precise measurements, Supports various iPhone and iPad models

**Features:** macOS Compatibility

**In-app purchases:** none


### Magnetometer ∞

[App page](https://appshunter.io/ios/app/magnetometer/id6753061844)

Visualize magnetic fields in real-time with precision charts and monitor X, Y, Z axis readings. Ideal for scientific research, education, and field work, this app offers professional-grade accuracy and an intuitive interface for easy data interpretation.

**Highlights:** Real-time magnetic field visualization, X, Y, Z axis readings in microteslas, Scientific research tool, Educational aid, Field work companion, Intuitive interface

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $1.99 | per 7 days |
| Lifetime | $9.99 | one-time |


## Frequently asked questions

### Is RadioactivityCounter free?

RadioactivityCounter costs $4.99, with no in-app purchases.

### Is Magnetometer ∞ free?

Magnetometer ∞ is free to download, with in-app purchases available.

### Which has better reviews, RadioactivityCounter or Magnetometer ∞?

Magnetometer ∞ is rated higher. RadioactivityCounter averages 3.1 out of 5 from 10 ratings, while Magnetometer ∞ averages 4.4 from 59 ratings.

### Do RadioactivityCounter or Magnetometer ∞ have ads?

Magnetometer ∞ shows ads; RadioactivityCounter does not.

### Which is updated more often, RadioactivityCounter or Magnetometer ∞?

RadioactivityCounter ships an update every 15 months, and Magnetometer ∞ every 2 weeks. Most recently, RadioactivityCounter was updated on November 6, 2026 and Magnetometer ∞ on November 8, 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.*