# Gas Engine Magazine vs SE Oklahoma Library System

The clearest difference is in-app purchases: SE Oklahoma Library System at none against Gas Engine Magazine's 10. SE Oklahoma Library System also leads on ads (none vs shown). Gas Engine Magazine's advantage is iOS requirement (13.0 vs 15.6). On price, update cadence and device support there is nothing between them.

Both are free to download. Gas Engine Magazine sells 10 in-app purchases, starting at $2.99 per month. SE Oklahoma Library System asks for nothing beyond the download.

Gas Engine Magazine ships an update every 4 months, SE Oklahoma Library System every 3 months. Both last shipped on November 3, 2026.

## The numbers

| Metric | Gas Engine Magazine | SE Oklahoma Library System |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.9 (12 ratings)](https://appshunter.io/ios/app/gas-engine-magazine/id878048300/reviews)** | — |
| Number of ratings | **12** | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 4 months | **Every 3 months** |
| Monetization | Free with in-app purchases | — |
| Size | 41 MB | 50 MB |
| Requires iOS | **13.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Ogden Publications, Inc.](https://appshunter.io/developer/450808661) | [Southeast Oklahoma Library System](https://appshunter.io/developer/1576875473) |

## What reviewers say

### Gas Engine Magazine

[App page](https://appshunter.io/ios/app/gas-engine-magazine/id878048300)

This publication offers in-depth information for tractor and stationary gas engine enthusiasts. Discover restoration stories, company histories, technical advice, and connect with a community of collectors. Search for parts and get your engine inquiries answered.

**Highlights:** Tractor and stationary gas engine information, Restoration stories, Company histories, Technical advice, Community connection, Parts search, Engine inquiries answered

**Features:** Vision Pro support

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Gas Engine Magazine | $2.99 | per month |
| Gas Engine Magazine | $32.99 | per year |
| October/November 2013 | $6.99 | one-time |
| February/March 2016 | $6.99 | one-time |
| June/July 2016 | $6.99 | one-time |
| December/January 2017 | $6.99 | one-time |
| February/March 2017 | $6.99 | one-time |
| April/May 2019 | $6.99 | one-time |
| GasEngineMag Feed 5 | $6.99 | one-time |
| GasEngineMag Feed 31 | $6.99 | one-time |


### SE Oklahoma Library System

[App page](https://appshunter.io/ios/app/se-oklahoma-library-system/id1576875471)

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

**In-app purchases:** none


## Frequently asked questions

### Is Gas Engine Magazine free?

Gas Engine Magazine is free to download, with in-app purchases available.

### Is SE Oklahoma Library System free?

SE Oklahoma Library System is free to download, with no in-app purchases.

### Do Gas Engine Magazine or SE Oklahoma Library System have ads?

Gas Engine Magazine shows ads; SE Oklahoma Library System does not.

### Which is updated more often, Gas Engine Magazine or SE Oklahoma Library System?

Gas Engine Magazine ships an update every 4 months, and SE Oklahoma Library System every 3 months. Most recently, Gas Engine Magazine was updated on November 3, 2026 and SE Oklahoma Library System on November 3, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*