# Fibonacci Numbers vs CatStack!

The clearest difference is in-app purchases: CatStack! at none against Fibonacci Numbers's 1. Fibonacci Numbers's advantage is iOS requirement (15.6 vs 18.5). On price, ads and device support there is nothing between them.

Both are free to download. Fibonacci Numbers sells 1 one-off in-app purchase. CatStack! asks for nothing beyond the download.

## The numbers

| Metric | Fibonacci Numbers | CatStack! |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 10 days | — |
| Size | 24 MB | 42 MB |
| Requires iOS | **15.6** | 18.5 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [海军 王](https://appshunter.io/developer/1756634009) | [TAKURO INOUE](https://appshunter.io/developer/1806841917) |

## What reviewers say

### Fibonacci Numbers

[App page](https://appshunter.io/ios/app/fibonacci-numbers/id6566185190)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 2000Coins | $0.99 | one-time |


### CatStack!

[App page](https://appshunter.io/ios/app/catstack/id6747741193)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Fibonacci Numbers free?

Fibonacci Numbers is free to download, with in-app purchases available.

### Is CatStack! free?

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

### Do Fibonacci Numbers or CatStack! have ads?

Neither Fibonacci Numbers nor CatStack! 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.*