# OpenRadiation vs GMCMap

The clearest difference is review sentiment: GMCMap at 70% against OpenRadiation's 0%. GMCMap also leads on rating (4.1 vs 2.0) and ratings volume (19 vs 4). On price, update cadence, ads and in-app purchases there is nothing between them.

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

GMCMap holds the better App Store score, 4.1 against 2.0. Both are backed by a comparable volume of ratings — 4 and 19 respectively. Written reviews point the same way: 0% of OpenRadiation's written reviews are positive against 70% of GMCMap's.

OpenRadiation ships an update every 3 months, GMCMap every 5 months. The most recent releases landed on June 1, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | OpenRadiation | GMCMap |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.0 (4 ratings)](https://appshunter.io/ios/app/openradiation/id1246249831/reviews) | **[4.1 (19 ratings)](https://appshunter.io/ios/app/gmcmap/id6459882680/reviews)** |
| Number of ratings | 4 | **19** |
| Positive reviews | 0.0% of reviews | **70.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 5 months |
| Monetization | Free | Free |
| Size | 54 MB | 27 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Autorite de surete nucleaire et de radioprotection](https://appshunter.io/developer/1861431469) | [GQ Electronics LLC](https://appshunter.io/developer/1379843069) |

## What reviewers say

### 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

**In-app purchases:** none


### GMCMap

[App page](https://appshunter.io/ios/app/gmcmap/id6459882680)

This app provides a real-time radiation map of the world, displaying current radiation levels from monitoring stations globally. It features an interactive map, historical data, and trend analysis for comprehensive environmental vigilance.

**Highlights:** Real-time radiation data, Global coverage map, Interactive map interface, Historical data and trends, Mobile convenience

**In-app purchases:** none


## Frequently asked questions

### Is OpenRadiation free?

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

### Is GMCMap free?

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

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

GMCMap is rated higher. OpenRadiation averages 2.0 out of 5 from 4 ratings, while GMCMap averages 4.1 from 19 ratings.

### Do OpenRadiation or GMCMap have ads?

Neither OpenRadiation nor GMCMap shows ads.

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

OpenRadiation ships an update every 3 months, and GMCMap every 5 months. Most recently, OpenRadiation was updated on June 1, 2026 and GMCMap on September 22, 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.*