# calcMod vs Rectangles & Primes

The clearest difference is update cadence: Rectangles & Primes at every 3 weeks against calcMod's every 18 months. On price, ads, in-app purchases and device support there is nothing between them.

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

calcMod ships an update every 18 months, Rectangles & Primes every 3 weeks. Both last shipped on October 2, 2026.

## The numbers

| Metric | calcMod | Rectangles & Primes |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/calcmod-light/id1445360983/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 18 months | **Every 3 weeks** |
| Monetization | Free | — |
| Size | 1 MB | 10 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Alain Cardinaux](https://appshunter.io/developer/1443066124) | [Johannes Charra](https://appshunter.io/developer/1557733427) |

## What reviewers say

### calcMod

[App page](https://appshunter.io/ios/app/calcmod-light/id1445360983)

This application helps users perform complex mathematical calculations, including factorials, primality tests, and modular arithmetic. It's designed for students and educators interested in number theory and the properties of integers.

**Highlights:** Factorial calculation up to 80!, Primality testing with change mod function, Divisor identification, Modular exponentiation, Modular inverse calculation, Number storage and recall

**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 calcMod free?

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

### Is Rectangles & Primes free?

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

### Do calcMod or Rectangles & Primes have ads?

Neither calcMod nor Rectangles & Primes shows ads.

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

calcMod ships an update every 18 months, and Rectangles & Primes every 3 weeks. Most recently, calcMod was updated on October 2, 2026 and Rectangles & Primes on October 2, 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.*