# Rectangles & Primes vs Cipher Forge

The clearest difference is device support: Rectangles & Primes at 3 against Cipher Forge's —. Rectangles & Primes also leads on iOS requirement (15.0 vs 17.0). On price and in-app purchases there is nothing between them.

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

## The numbers

| Metric | Rectangles & Primes | Cipher Forge |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | — |
| Update frequency | Every 3 weeks | — |
| Size | 10 MB | 5 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | — |
| Age rating | 4+ | 4+ |
| Developer | [Johannes Charra](https://appshunter.io/developer/1557733427) | [Curtis Wyattt](https://appshunter.io/developer/1854265519) |

## What reviewers say

### Rectangles & Primes

[App page](https://appshunter.io/ios/app/rectangles-and-primes/id1572074176)

**Features:** macOS Compatibility

**In-app purchases:** none


### Cipher Forge

[App page](https://appshunter.io/ios/app/cipher-forge/id6755501126)

**In-app purchases:** none


## Frequently asked questions

### Is Rectangles & Primes free?

Rectangles & Primes is free to download, with no in-app purchases.

### Is Cipher Forge free?

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

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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.*