# Pocket Geiger Counter Lite

> iPhone radiation detector using external sensor hardware for beta and gamma radiation. (iPhone/iPad app by radiation-watch.)

- Source: https://appshunter.io/ios/app/pocket-geiger-counter-lite/id448044891 (this page in markdown: same URL + `.md`)
- Developer: [radiation-watch](https://appshunter.io/developer/448043818)
- Category: Utilities
- Price: Free
- Rating: 1.40/5 from 10 App Store ratings · 17 written reviews indexed
- Age rating: 4+
- Requires: iOS 6.0 · 1 MB
- Languages: American English, Japanese
- Released: 2011-07-11
- Data updated: 2026-08-25
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/pocket-geiger-counter-lite/id448044891/reviews.md

## What is Pocket Geiger Counter Lite?

(You cannot measure the radiation only by using this application program) 

iPhone can be used as a radiation detector, as it is called Geiger counter, by connecting the voice output of the Pocket Geiger Counter with the microphone input. 
For more information about Pocket Geiger Counter, see http://www.radiation-watch.org 


Sensor: PIN photo diode x8 (reverse biased and shielded) 
Detectable radiations: Beta and Gamma radiation 
Measurement range: 0.05uSv/h~10mSv/h (Calibrated using Cs-137), 0.01cpm~300000cpm 
Measuring time: about 5 minutes at the dose rate of 0.05uSv/h 
Energy response: :662keV~1333keV 


- uSv/h and its counting error calculation 
- CPM calculation 
- Manual setting interface for time range and threshold *Pro version only 
- Oscilloscope *Pro version only 
- Detection log visualization *Pro version only 
- Circuit diagram *Pro version only 

*NOTE* 
We are making the smart radiation detector that everyone can buy at a low price especially in and around Fukushima. 
The project is supported by volunteer engineers, designers and scientists. 
http://www.radiation-watch.org/

## Key features

- Radiation detection (beta and gamma)
- uSv/h and CPM calculation
- External sensor connection
- Dose rate measurement
- Energy response data

## Recent user reviews (10 of 17)

All indexed reviews: https://appshunter.io/ios/app/pocket-geiger-counter-lite/id448044891/reviews.md

### 1/5 — Meh could be way better

*2025-08-15, version 1.37*

I used it and obviously phones can’t detect radiation so I put it near a high power magnet…. Didn’t work, in the sun…… didn’t work

### 1/5 — Fred

*2020-05-14, version 1.37*

What a rubbish app. Kept saying not connected-pointless so don’t bother!

### 1/5 — Doesn’t work

*2020-02-26, version 1.37*

Just does nothing at all.
Totally pointless.

### 1/5 — No

*2019-07-27*

Nononono

### 1/5 — Literally Doo doo

*2019-01-03*

This app works, but you need to hook it up to a real Geiger Counter in order for it to work! I thought the whole point of the app was to not need an external device! This thing is a big fat pile of doo doo!

### 5/5 — Here is your answer as to why it doesn’t work,

*2018-09-26*

You need to connect a pocket Geiger counter, nice reading skills though.

### 1/5 — Pointless

*2018-09-24*

It does nothing but give error messages and does not explain how to resolve them. The app makes you think that you are to blame for the errors. It gave me a headache. I'm deleting it now.

### 1/5 — Does not work

*2018-09-15*

Garbage, needs to be taken off of available download’s list.

### 1/5 — Does not work

*2018-06-07*

Don’t bother

### 1/5 — Doesn’t work

*2018-03-09, version 1.37*

Got the app for curiosity reasons, not sure if I’m doing something wrong 
But it doesn’t work 
Just says it’s not connected?
Connected to what and how?

## Frequently asked questions about Pocket Geiger Counter Lite

### What can Pocket Geiger Counter Lite measure?

Pocket Geiger Counter Lite can detect Beta and Gamma radiation. It measures the dose rate in uSv/h and provides CPM (counts per minute) calculations. The measurement range is from 0.05uSv/h to 10mSv/h.

### Does Pocket Geiger Counter Lite work without external hardware?

No, this application cannot measure radiation on its own. It requires external hardware, specifically a PIN photo diode sensor, to be connected to the iPhone's voice output and microphone input to function as a radiation detector.

### How accurate is Pocket Geiger Counter Lite?

The app is calibrated using Cs-137 and provides counting error calculations for uSv/h. The measuring time is approximately 5 minutes at a dose rate of 0.05uSv/h. Energy response is detailed for 662keV~1333keV.

### What devices does Pocket Geiger Counter Lite support?

Pocket Geiger Counter Lite is designed for iPhone and iPod devices. It was last updated on March 7, 2017, with version 1.37.

### What is the age rating for Pocket Geiger Counter Lite?

Pocket Geiger Counter Lite has an age rating of 4+. This indicates it is suitable for users aged 4 and above.

### Is Pocket Geiger Counter Lite free to use?

Yes, Pocket Geiger Counter Lite is available for free. There are no in-app purchases or advertisements mentioned in the provided data.

### Where can I find more information about Pocket Geiger Counter Lite?

More information about Pocket Geiger Counter Lite, including details about its development and purpose, can be found at http://www.radiation-watch.org. The project is supported by volunteer engineers, designers, and scientists.

### Does Pocket Geiger Counter Lite have ads?

No, Pocket Geiger Counter Lite does not contain advertisements. The app is free and does not feature any ads, according to the provided data.

## Version history (last 5 releases)

### 1.37 — 2017-03-07

This app has been updated by Apple to display the Apple Watch app icon.

add parameter for iPhone SE

### 1.36 — 2016-11-14

add Parameter for iPhone 7 / iPhone 7 Plus

### 1.35 — 2016-06-21

Add Parameter iPad 2/3/4

### 1.34 — 2016-04-25

・add Parameter for iPod touch 6
・bugfix: device name

### 1.33 — 2016-03-16

1. fixed background color
2. add parameter for iPad Air1/Air2

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## More apps by radiation-watch

- [Pocket Geiger Counter Pro](https://appshunter.io/ios/app/pocket-geiger-counter-pro/id448043815)
- [ShakeLogger](https://appshunter.io/ios/app/shakelogger/id1596137993)

All apps by radiation-watch: https://appshunter.io/developer/448043818

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*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 2026-08-25.*