# Cosmic Ray - Detect Radiation — Global Cosmic Ray Observatory

> Detect cosmic rays from space using your phone's camera. (iPhone/iPad app by Palmer Andersen Design & Development Ltd..)

- Source: https://appshunter.io/ios/app/cosmic-ray-detect-radiation/id1169131314 (this page in markdown: same URL + `.md`)
- Developer: [Palmer Andersen Design & Development Ltd.](https://appshunter.io/developer/840149271)
- Category: Education, Photo & Video
- Price: Free
- Rating: 3.67/5 from 9 App Store ratings · 10 written reviews indexed
- Age rating: 4+
- Requires: iOS 12.3 · 2 MB
- Languages: English
- Released: 2017-01-20
- Data updated: 2026-06-10
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/cosmic-ray-detect-radiation/id1169131314/reviews.md

## What is Cosmic Ray?

Cosmic Ray App is a new iOS application that allows users to detect cosmic rays from outer space with nothing but their phone. The application works by detecting bright spots in the phone's camera when no light is entering. Some of these bright flashes are a result of cosmic rays, so anyone can detect cosmic rays with the camera in their phone.

You can save nice events with an email or in your iCloud account or other sharing services. Please contact us with ideas and suggestions!

A dedicated slider is recommended for blocking the camera, but electrical tape will also work.

## Key features

- Detect cosmic rays with phone camera
- Identify bright flashes
- Save detected events
- Share events via email/iCloud
- Requires camera blocking

## Recent user reviews (10 of 10)

All indexed reviews: https://appshunter.io/ios/app/cosmic-ray-detect-radiation/id1169131314/reviews.md

### 5/5 — Question

*2025-01-07*

Could the developer or someone from this app please contact me. I have a couple questions. I’m not sure the best contact method as I don’t want my info on blast. Possibly you could respond with a way for me to contact you. Much appreciated. Jenny

### 4/5 — Fascinating

*2024-12-07*

I found out about this app from a The Action Lab video. You need to make it so that the system does not calibrate and stay sensitive to the initial amount of light. A user should be able to start the app THEN cover the camera and still see particle trails.

### 1/5 — How high are you

*2023-11-18*

Like seriously

### 5/5 — This app is so cool

*2022-07-03, version 1.3.3*

I love watching the map on the website and seeing my readings pop up. It's too bad that i'm one of two people in the world right now contributing their results to the public. Still though, it's awesome. On a side note, i have a hunch that cosmic particles can be influenced by the mind. Just throwing that out there.

### 1/5 — Not sure if this works anymore

*2021-11-03, version 1.3.3*

This used to work. But I don’t think it works anymore

### 5/5 — It good

*2021-06-29, version 1.3.3*

Good just like a good burger from that movie good burger

### 4/5 — Very interesting but

*2019-04-19*

Great app. However it is battery consuming very fast

### 3/5 — App need better UI for display of data.

*2019-01-29, version 1.3.2*

Detection is ok I guess but the app’s ability to clearly display the data is badly lacking.   The device & server data needs ways to sort and graphically show the user compared to other in different regions. Thanks for a good start.

### 3/5 — Seemed ok at first now it's does nothing.

*2017-08-22, version 1.1*

First few days it worked great then suddenly to day of eclipse it just shows a white page with no events showing up and past events are not showing up in the cloud.

### 1/5 — Not working?

*2017-04-05, version 1.0*

It launches with the white screen only. I don't know if it works or not? Maybe some "relaunch test" button would be helpfull. But for now it does nothing.

## Frequently asked questions about Cosmic Ray

### How does Cosmic Ray detect radiation?

Cosmic Ray works by using your phone's camera to detect bright flashes that occur when cosmic rays interact with the camera sensor. It identifies these flashes when no external light is entering the camera.

### What is the rating for Cosmic Ray?

Cosmic Ray has a rating of 3.7 stars based on 9 user ratings.

### Is Cosmic Ray free to download?

Yes, Cosmic Ray is available for free on the App Store.

### What devices support Cosmic Ray?

Cosmic Ray is supported on iPhone, iPad, and iPod devices.

### What is the age rating for Cosmic Ray?

Cosmic Ray has an age rating of 4+, making it suitable for young users and above.

### How often is Cosmic Ray updated?

The latest version, 1.3.3, was released on February 28, 2021. Users can expect updates to improve functionality and address any issues.

### Does Cosmic Ray have ads?

No, Cosmic Ray is ad-free, providing an uninterrupted user experience.

### How can I save detected cosmic ray events?

You can save detected events by sending them via email or storing them in your iCloud account, or by using other sharing services integrated with your device.

## Version history (last 5 releases)

### 1.3.3 — 2021-02-28

Bugs fixed.

### 1.3.2 — 2018-05-06

iPhone X bug fix

### 1.3.1 — 2018-04-10

Screen dimming issue fixed. Export to photos issue fixed.

### 1.3.0 — 2018-04-08

Now uses metal for pixel processing on iPhone 6 and newer, reducing energy usage. Fix some other issues.

### 1.2.5 — 2018-03-19

Lowered Energy usage. Screen Dims after 5min (in preferences). Improved algorithm​.

## Apps similar to Cosmic Ray

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [CPU8 Plus](https://appshunter.io/ios/app/cpu8-plus/id1518324298) | 5.0 (5) | Free | Education |
| [Hear Beyond](https://appshunter.io/ios/app/hear-beyond/id1529830800) | 3.4 (7) | Free | Education |
| [GoSkyWatch Planetarium iPad](https://appshunter.io/ios/app/goskywatch-planetarium-ipad/id364209241) | 4.6 (2,129) | Free | Education |
| [Stars and Planets - Astronomy](https://appshunter.io/ios/app/stars-and-planets-astronomy/id1170904676) | 4.7 (1,139) | Free | Education |
| [Cree Cards](https://appshunter.io/ios/app/cree-cards/id1575290349) | — | Free | Education |
| [NOSM Elentra Mobile](https://appshunter.io/ios/app/nosm-elentra-mobile/id1494322917) | — | Free | Education |

## More apps by Palmer Andersen Design & Development Ltd.

- [Photodrip - Simple Photo Streaming](https://appshunter.io/ios/app/photodrip-simple-photo-streaming/id654798973)

All apps by Palmer Andersen Design & Development Ltd.: https://appshunter.io/developer/840149271

---

*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-10.*