# Cathode Ray

> Cathode Ray (iPhone/iPad app by Heiko Etzold.)

- Source: https://appshunter.io/ios/app/cathode-ray/id861344538 (this page in markdown: same URL + `.md`)
- Developer: [Heiko Etzold](https://appshunter.io/developer/715739131)
- Category: Education
- Price: $0.99
- Age rating: 4+
- Requires: iOS 14.0 · 1 MB
- Languages: American English, German (Germany)
- Released: 2014-04-17
- Data updated: 2026-05-31
- User reviews in markdown: https://appshunter.io/ios/app/cathode-ray/id861344538/reviews.md

## What is Cathode Ray?

With this app you can simulate a cathode ray inside an electronic and magnetic field.

You can change the electric voltage and magnetic flux density to check which way the ray goes. For comparison the is also a ray of He-nucleus.


## Version history (last 4 releases)

### 2.1 — 2022-02-13

* It's now possible to change the time difference and the runtime of every particle source.

### 2.0 — 2021-01-30

* completely redesigned
* dark mode and Mac compatible 

* quantitative examination now possible
* you can now add more particle sources, electrical fields or magnetic fields
* use the ruler to measure the fields and rays

### 1.1 — 2014-07-25

* english version

### 1.0 — 2014-04-17

No release notes.

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## More apps by Heiko Etzold

- [Math Angle](https://appshunter.io/ios/app/math-angle/id715739128)
- [Cubeling](https://appshunter.io/ios/app/cubeling/id1027746349)
- [Isometric Paper](https://appshunter.io/ios/app/isometric-paper/id1045446163)
- [Click the Cube](https://appshunter.io/ios/app/click-the-cube/id1157365733)
- [Angle Farm](https://appshunter.io/ios/app/angle-farm/id1369585218)

All apps by Heiko Etzold: https://appshunter.io/developer/715739131

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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 2026-05-31.*