# PMA Operator Guide vs John Orr Engineering School

The clearest difference is update cadence: John Orr Engineering School at every 2 weeks against PMA Operator Guide's every 50 months. PMA Operator Guide's advantage is iOS requirement (14.0 vs 16.0). On price, ads, in-app purchases and device support there is nothing between them.

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

PMA Operator Guide ships an update every 50 months, John Orr Engineering School every 2 weeks. The most recent releases landed on September 10, 2026 and September 4, 2026 respectively.

## The numbers

| Metric | PMA Operator Guide | John Orr Engineering School |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 50 months | **Every 2 weeks** |
| Size | 15 MB | 53 MB |
| Requires iOS | **14.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 12+ | 12+ |
| Developer | [Hendrik Pottas](https://appshunter.io/developer/1091508729) | [Nextnow Group (Pty) Ltd](https://appshunter.io/developer/1550928706) |

## What reviewers say

### PMA Operator Guide

[App page](https://appshunter.io/ios/app/pma-operator-guide/id1091508730)

**Features:** macOS Compatibility

**In-app purchases:** none


### John Orr Engineering School

[App page](https://appshunter.io/ios/app/john-orr-engineering-school/id6741505975)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is PMA Operator Guide free?

PMA Operator Guide is free to download, with no in-app purchases.

### Is John Orr Engineering School free?

John Orr Engineering School is free to download, with no in-app purchases.

### Do PMA Operator Guide or John Orr Engineering School have ads?

Neither PMA Operator Guide nor John Orr Engineering School shows ads.

### Which is updated more often, PMA Operator Guide or John Orr Engineering School?

PMA Operator Guide ships an update every 50 months, and John Orr Engineering School every 2 weeks. Most recently, PMA Operator Guide was updated on September 10, 2026 and John Orr Engineering School on September 4, 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.*