# Rectangles & Primes vs Combine Tutorial

The clearest difference is in-app purchases: Rectangles & Primes at none against Combine Tutorial's 1. Rectangles & Primes also leads on ads (none vs shown) and update cadence (every 3 weeks vs every 34 months). On price and iOS requirement there is nothing between them.

Both are free to download. Combine Tutorial sells 1 one-off in-app purchase. Rectangles & Primes asks for nothing beyond the download.

Rectangles & Primes ships an update every 3 weeks, Combine Tutorial every 34 months. The most recent releases landed on October 2, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | Rectangles & Primes | Combine Tutorial |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 3 weeks** | Every 34 months |
| Size | 10 MB | 6 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Johannes Charra](https://appshunter.io/developer/1557733427) | [红燕 马](https://appshunter.io/developer/1635360556) |

## What reviewers say

### Rectangles & Primes

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

**Features:** macOS Compatibility

**In-app purchases:** none


### Combine Tutorial

[App page](https://appshunter.io/ios/app/combine-tutorial/id6470148946)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| COMBINE TUTORIAL | $0.99 | one-time |


## Frequently asked questions

### Is Rectangles & Primes free?

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

### Is Combine Tutorial free?

Combine Tutorial is free to download, with in-app purchases available.

### Do Rectangles & Primes or Combine Tutorial have ads?

Combine Tutorial shows ads; Rectangles & Primes does not.

### Which is updated more often, Rectangles & Primes or Combine Tutorial?

Rectangles & Primes ships an update every 3 weeks, and Combine Tutorial every 34 months. Most recently, Rectangles & Primes was updated on October 2, 2026 and Combine Tutorial on September 30, 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.*