# Greatest Common Divisor vs Jackson

The clearest difference is price: Jackson at Free against Greatest Common Divisor's $0.99. Jackson also leads on update cadence (every 3 months vs every 36 months). Greatest Common Divisor's advantage is iOS requirement (11.0 vs 15.1). On ads, in-app purchases and device support there is nothing between them.

Jackson is free to download; Greatest Common Divisor costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Greatest Common Divisor ships an update every 36 months, Jackson every 3 months. The most recent releases landed on September 27, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Greatest Common Divisor | Jackson |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/jackson-madison-county-library/id1584226874/reviews)** |
| Number of ratings | — | **3** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 36 months | **Every 3 months** |
| Monetization | — | Free |
| Size | 1 MB | 56 MB |
| Requires iOS | **11.0** | 15.1 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Manfred Breede](https://appshunter.io/developer/414696754) | [Jackson Madison County Library](https://appshunter.io/developer/1584226876) |

## What reviewers say

### Greatest Common Divisor

[App page](https://appshunter.io/ios/app/greatest-common-divisor/id698020846)

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

**In-app purchases:** none


### Jackson

[App page](https://appshunter.io/ios/app/jackson-madison-county-library/id1584226874)

Access all library services, events, hours, and locations. Log in to manage your account, check book status, and sign up for a library card or e-card. Connect with social media for updates.

**Highlights:** Library services and events listing, Hours and locations, Account login and book status, Library card and e-card sign-up, Social media integration

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Greatest Common Divisor free?

Greatest Common Divisor costs $0.99, with no in-app purchases.

### Is Jackson free?

Jackson is free to download, with no in-app purchases.

### Do Greatest Common Divisor or Jackson have ads?

Neither Greatest Common Divisor nor Jackson shows ads.

### Which is updated more often, Greatest Common Divisor or Jackson?

Greatest Common Divisor ships an update every 36 months, and Jackson every 3 months. Most recently, Greatest Common Divisor was updated on September 27, 2026 and Jackson on November 3, 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.*