# iPeriodic for iPhone vs Electromagnetic Forces

The clearest difference is price: iPeriodic for iPhone at Free against Electromagnetic Forces's $0.99. iPeriodic for iPhone also leads on update cadence (every 8 days vs every 32 months) and iOS requirement (6.1 vs 12.0). Electromagnetic Forces's advantage is in-app purchases (none vs 1). On ads and device support there is nothing between them.

iPeriodic for iPhone is free to download; Electromagnetic Forces costs $0.99 up front. iPeriodic for iPhone sells 1 one-off in-app purchase. Electromagnetic Forces asks for nothing beyond the download.

iPeriodic for iPhone ships an update every 8 days, Electromagnetic Forces every 32 months. The most recent releases landed on September 26, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | iPeriodic for iPhone | Electromagnetic Forces |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | — | **[1.0 (1 ratings)](https://appshunter.io/ios/app/electromagnetic-forces-emf/id1159691990/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 8 days** | Every 32 months |
| Monetization | — | Paid |
| Size | 16 MB | 25 MB |
| Requires iOS | **6.1** | 12.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Thitipong Wongsatho](https://appshunter.io/developer/683911170) | [www.ajaxmediatech.com](https://appshunter.io/developer/973768003) |

## What reviewers say

### iPeriodic for iPhone

[App page](https://appshunter.io/ios/app/iperiodic-for-iphone/id963558647)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads ($0.99) | $0.99 | one-time |


### Electromagnetic Forces

[App page](https://appshunter.io/ios/app/electromagnetic-forces-emf/id1159691990)

This educational app uses interactive 3D animations and experiments to explain electromagnetism and cathode rays for K12 students. It covers Fleming's left-hand rule, cathode ray structure, and the Cathode Ray Oscilloscope, with practice exercises and quizzes to reinforce learning.

**Highlights:** Interactive 3D animations, Explains Fleming's left-hand rule, Demonstrates cathode ray structure, Illustrates Cathode Ray Oscilloscope, Practice exercises, Interactive quizzes

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is iPeriodic for iPhone free?

iPeriodic for iPhone is free to download, with in-app purchases available.

### Is Electromagnetic Forces free?

Electromagnetic Forces costs $0.99, with no in-app purchases.

### Do iPeriodic for iPhone or Electromagnetic Forces have ads?

Neither iPeriodic for iPhone nor Electromagnetic Forces shows ads.

### Which is updated more often, iPeriodic for iPhone or Electromagnetic Forces?

iPeriodic for iPhone ships an update every 8 days, and Electromagnetic Forces every 32 months. Most recently, iPeriodic for iPhone was updated on September 26, 2026 and Electromagnetic Forces on September 18, 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.*