# Incredible Numbers! vs Rectangles & Primes

The clearest difference is price: Rectangles & Primes at Free against Incredible Numbers!'s $6.99. Rectangles & Primes also leads on update cadence (every 3 weeks vs every 10 months) and device support (3 vs 1). Incredible Numbers!'s advantage is iOS requirement (12.1 vs 15.0). On ads and in-app purchases there is nothing between them.

Rectangles & Primes is free to download; Incredible Numbers! costs $6.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Incredible Numbers! ships an update every 10 months, Rectangles & Primes every 3 weeks. The most recent releases landed on October 19, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Incredible Numbers! | Rectangles & Primes |
| --- | --- | --- |
| Price | $6.99 | **Free** |
| Rating | **[5.0 (9 ratings)](https://appshunter.io/ios/app/incredible-numbers/id824146218/reviews)** | — |
| Number of ratings | **9** | — |
| Positive reviews | 73.1% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 10 months | **Every 3 weeks** |
| Monetization | Paid | — |
| Size | 107 MB | 10 MB |
| Requires iOS | **12.1** | 15.0 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [NatureGuides Ltd.](https://appshunter.io/developer/310574314) | [Johannes Charra](https://appshunter.io/developer/1557733427) |

## What reviewers say

### Incredible Numbers!

[App page](https://appshunter.io/ios/app/incredible-numbers/id824146218)

Explore the hidden beauty of mathematics with interactive examples and puzzles. Discover concepts like infinity, Pi, and prime numbers through engaging articles and demonstrations crafted by a renowned professor. Uncover the mathematical patterns in nature, music, and codes.

**Highlights:** 23 articles by Professor Ian Stewart, 71 interactive demonstrations, 15 mathematical puzzles, Topics: Infinity, Pi, Music, Codes, Nature, Primes, Polygons, Factorials, Interactive examples and simulations, Focus on the beauty of mathematics

**Features:** macOS Compatibility

**In-app purchases:** none


### Rectangles & Primes

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

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Incredible Numbers! free?

Incredible Numbers! costs $6.99, with no in-app purchases.

### Is Rectangles & Primes free?

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

### Do Incredible Numbers! or Rectangles & Primes have ads?

Neither Incredible Numbers! nor Rectangles & Primes shows ads.

### Which is updated more often, Incredible Numbers! or Rectangles & Primes?

Incredible Numbers! ships an update every 10 months, and Rectangles & Primes every 3 weeks. Most recently, Incredible Numbers! was updated on October 19, 2026 and Rectangles & Primes on October 25, 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.*