Comparison

RadioactivityCounter vs Magnetometer ∞

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

RadioactivityCounter

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
Currently charting
Read full description

RadioactivityCounter This application is a real working radioactivity counter without any extra hardware needed ! It will turn your phone into a Geiger Müller Counter to measure radioactivity after proper calibration. ** Attention after upgrading iOS to a higher iOS do the calibrate again, as camera data properties might have changed ** Disclaimer: The type of radiation picked up by the camera can be dangerous/detrimental to the user's health as well as cause damage to the device. Important note: The camera sensor can measure gamma radiation (CS137 for example) and some beta radiation (depends on the energy if the beta rays can pass through the plastic parts - for example H3 or K14 are weak sources). It cannot measure alpha rays (PO210) For AM241 though its primary a Alpha source also some gamma radiation is emitted and might be detectable for a longer measurement. Please check our homepages for examples and hints on how to measure. We did calibrations with several iPod2*, IPhone 3GS*, iPhone 4*, iPhone 4S, iPhone5, iPhone 5S iPhone 6, 6s and iPad 2, iPad 3* devices at the Helmholtz Research Centre, Munich. we used a CS137 test source from 10 µGy/h till 1 Sv/h for each of the phones we had. The values are stored for a rough start on the application (all devices differ a little bit). For precise professional measurement the devices must be adjusted to the sensor which is possible with the expert setup. For personal use the defaults should be sufficient (please give us feedback). * = Attention some phone might not be compatible due the new version of iOS or missing features (gps precision using sim cards)- please try to use an older rev of the App which should be available according to my settings (1.3).

About

Magnetometer ∞

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
Read full description

Magnetometer Visualizer - Explore the invisible magnetic world - Visualize magnetic fields in real-time with precision charts - Monitor X, Y, Z axis readings in microteslas (µT) - Perfect for scientific research, education, and field work - Professional-grade accuracy for reliable measurements - Clean, intuitive interface for easy data interpretation Whether you're a researcher, student, or professional, unlock the power of magnetic field analysis with stunning real-time visualization. Privacy Policy: https://apps.fawkeswei.com/magnetometer/privacy Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

RadioactivityCounter2 screens
Magnetometer ∞2 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard9 real differences · 2 level
RadioactivityCounter versus Magnetometer ∞: the parameters behind the verdict, then further details
ParameterRadioactivityCounterMagnetometer ∞
Price$4.99Free — better
Rating3.1 (10 ratings)4.4 (59 ratings) — better
Positive reviews68.4% of reviews—
Number of ratings1059 — better
Update frequencyEvery 15 monthsEvery 2 weeks — better
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
Best chart rank#184 — better—
DevicesiPhone, iPod — betteriPhone
Requires iOS8.0 — better17.0
Further details — not scored
Size11 MB16 MB
Age rating4+4+
DeveloperDipl.-Ing. Rolf-Dieter KleinFawkes Wei

Customer experience

RadioactivityCounter

All ratings10 ratings
Positive50.0%
Neutral0.0%
Negative50.0%
Written reviews19 reviews
Positive68.4%
Neutral5.3%
Negative26.3%

Magnetometer ∞

All ratings59 ratings
Positive86.4%
Neutral5.1%
Negative8.5%

In-app purchases

None

RadioactivityCounter

No in-app purchases

2 purchases

Magnetometer ∞

Subscriptions1
  • Weekly$1.997 Days
One-time1
  • Lifetime$9.99

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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