Comparison

RadioactivityCounter vs EMF Detector

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
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

EMF Detector

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
Read full description

Monitor your surroundings with precision using our EMF Monitoring app, designed exclusively for iOS. This innovative application transforms your iPhone into a powerful EMF detector, enabling you to identify electromagnetic fields in various environments. As you move through different areas, the app continuously measures EMF levels, allowing you to easily pinpoint zones of high and low radiation. Whether you're concerned about safety at home, in the workplace, or in public areas, EMF Monitoring provides the insights you need to assess environmental safety and make informed decisions about your surroundings. This app is using the standard Apple Terms of Use (EULA) https://www.apple.com/legal/ internet-services/itunes/dev/stdeula/

Screenshots

RadioactivityCounter2 screens
EMF Detector3 screens

Verdict

The call

The clearest difference is price: EMF Detector at Free against RadioactivityCounter's $4.99. EMF Detector also leads on rating (4.3 vs 3.1) and update cadence (every 2 weeks vs every 15 months). RadioactivityCounter's advantage is review sentiment (68% vs 25%) and in-app purchases (none vs 3). On ads and 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

EMF Detector is free to download; RadioactivityCounter costs $4.99 up front. EMF Detector sells 2 in-app purchases, starting at $4.99 per month. RadioactivityCounter asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

EMF Detector holds the better App Store score, 4.3 against 3.1. That said, the two scores are not equally well evidenced: EMF Detector has 319 ratings behind it against 10, so its average is the more settled of the two. Written reviews complicate that: 68% of RadioactivityCounter's written reviews are positive against 25% of EMF Detector's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

RadioactivityCounter ships an update every 15 months, EMF Detector every 2 weeks. The most recent releases landed on October 5, 2026 and October 13, 2026 respectively.

Scorecard8 real differences · 2 level
RadioactivityCounter versus EMF Detector: the parameters behind the verdict, then further details
ParameterRadioactivityCounterEMF Detector
Price$4.99Free — better
Rating3.1 (10 ratings)4.3 (319 ratings) — better
Positive reviews68.4% of reviews — better25.0% of reviews
Number of ratings10319 — better
Update frequencyEvery 15 monthsEvery 2 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS8.0 — better13.0
Further details — not scored
Size11 MB11 MB
Age rating4+4+
DeveloperDipl.-Ing. Rolf-Dieter Klein新雨 李

Customer experience

RadioactivityCounter

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

EMF Detector

All ratings319 ratings
Positive83.4%
Neutral4.1%
Negative12.5%
Written reviews16 reviews
Positive25.0%
Neutral0.0%
Negative75.0%

In-app purchases

None

RadioactivityCounter

No in-app purchases

2 purchases

EMF Detector

Subscriptions1
  • unlimited features2 variants$4.991 Month
One-time1
  • unlimited features$14.99

Questions

Is RadioactivityCounter free?
RadioactivityCounter costs $4.99, with no in-app purchases.
Is EMF Detector free?
EMF Detector is free to download, with in-app purchases available.
Which has better reviews, RadioactivityCounter or EMF Detector?
EMF Detector is rated higher. RadioactivityCounter averages 3.1 out of 5 from 10 ratings, while EMF Detector averages 4.3 from 319 ratings.
Do RadioactivityCounter or EMF Detector have ads?
Neither RadioactivityCounter nor EMF Detector shows ads.
Which is updated more often, RadioactivityCounter or EMF Detector?
RadioactivityCounter ships an update every 15 months, and EMF Detector every 2 weeks. Most recently, RadioactivityCounter was updated on October 5, 2026 and EMF Detector on October 13, 2026.

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