# RadioactivityCounter vs OpenRadiation

The clearest difference is review sentiment: RadioactivityCounter at 68% against OpenRadiation's 0%. RadioactivityCounter also leads on rating (3.1 vs 2.0) and iOS requirement (8.0 vs 15.0). OpenRadiation's advantage is price (Free vs $4.99) and update cadence (every 3 months vs every 15 months). On ratings volume, ads, in-app purchases and device support there is nothing between them.

OpenRadiation is free to download; RadioactivityCounter costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

RadioactivityCounter holds the better App Store score, 3.1 against 2.0. Both are backed by a comparable volume of ratings — 10 and 4 respectively. Written reviews point the same way: 68% of RadioactivityCounter's written reviews are positive against 0% of OpenRadiation's.

RadioactivityCounter ships an update every 15 months, OpenRadiation every 3 months. The most recent releases landed on October 5, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | RadioactivityCounter | OpenRadiation |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | **[3.1 (10 ratings)](https://appshunter.io/ios/app/radioactivitycounter/id464004677/reviews)** | [2.0 (4 ratings)](https://appshunter.io/ios/app/openradiation/id1246249831/reviews) |
| Number of ratings | **10** | 4 |
| Positive reviews | **68.4% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 15 months | **Every 3 months** |
| Monetization | Paid | **Free** |
| Size | 11 MB | 57 MB |
| Requires iOS | **8.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Dipl.-Ing. Rolf-Dieter Klein](https://appshunter.io/developer/309148367) | [ASNR](https://appshunter.io/developer/1861431469) |

## What reviewers say

### RadioactivityCounter

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

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


### OpenRadiation

[App page](https://appshunter.io/ios/app/openradiation/id1246249831)

Measure ambient radioactivity levels and assess your exposure to ionizing radiation using a compatible sensor. Contribute to a citizen science project by sharing your measurements to build a collaborative database.

**Highlights:** Measure radioactivity levels, Assess radiation exposure, Contribute to citizen science, Collaborative data database, Share measurements, View data online

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

**In-app purchases:** none


## Frequently asked questions

### Is RadioactivityCounter free?

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

### Is OpenRadiation free?

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

### Which has better reviews, RadioactivityCounter or OpenRadiation?

RadioactivityCounter is rated higher. RadioactivityCounter averages 3.1 out of 5 from 10 ratings, while OpenRadiation averages 2.0 from 4 ratings.

### Do RadioactivityCounter or OpenRadiation have ads?

Neither RadioactivityCounter nor OpenRadiation shows ads.

### Which is updated more often, RadioactivityCounter or OpenRadiation?

RadioactivityCounter ships an update every 15 months, and OpenRadiation every 3 months. Most recently, RadioactivityCounter was updated on October 5, 2026 and OpenRadiation on October 7, 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.*