# Gamebook Engine vs WhatChanged

The clearest difference is price: Gamebook Engine at $4.99 against WhatChanged's $9.99. On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Gamebook Engine costs $4.99 and WhatChanged $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | Gamebook Engine | WhatChanged |
| --- | --- | --- |
| Price | **$4.99** | $9.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | — | Every 3 weeks |
| Size | 3 MB | 31 MB |
| Requires iOS | **15.6** | 16.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Brad Root](https://appshunter.io/developer/1158641227) | [Iri You](https://appshunter.io/developer/1814472799) |

## What reviewers say

### Gamebook Engine

[App page](https://appshunter.io/ios/app/gamebook-engine/id1478537871)

**Features:** Vision Pro support

**In-app purchases:** none


### WhatChanged

[App page](https://appshunter.io/ios/app/whatchanged-folder-compare/id6759179141)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Gamebook Engine free?

Gamebook Engine costs $4.99, with no in-app purchases.

### Is WhatChanged free?

WhatChanged costs $9.99, with no in-app purchases.

### Do Gamebook Engine or WhatChanged have ads?

Neither Gamebook Engine nor WhatChanged shows ads.

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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.*