# Prime Checker vs Rectangles & Primes

The clearest difference is update cadence: Rectangles & Primes at every 3 weeks against Prime Checker's every 17 months. Prime Checker's advantage is iOS requirement (12.4 vs 15.0). 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.

Prime Checker ships an update every 17 months, Rectangles & Primes every 3 weeks. The most recent releases landed on August 29, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | Prime Checker | Rectangles & Primes |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/prime-checker/id389112910/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 95.8% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 17 months | **Every 3 weeks** |
| Monetization | Free | — |
| Size | 3 MB | 10 MB |
| Requires iOS | **12.4** | 15.0 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Heart Solutions, Inc.](https://appshunter.io/developer/389112913) | [Johannes Charra](https://appshunter.io/developer/1557733427) |

## What reviewers say

### Prime Checker

[App page](https://appshunter.io/ios/app/prime-checker/id389112910)

This app performs advanced mathematical calculations for numbers, including integer factorization, Euler's totient function, and solving specific Diophantine equations. It utilizes advanced algorithms for factorization and primality testing.

**Highlights:** Integer factorization, Euler's totient function, Primitive root calculation, Diophantine equation solver, Primality testing

**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 Prime Checker free?

Prime Checker 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 Prime Checker or Rectangles & Primes have ads?

Neither Prime Checker nor Rectangles & Primes shows ads.

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

Prime Checker ships an update every 17 months, and Rectangles & Primes every 3 weeks. Most recently, Prime Checker was updated on August 29, 2026 and Rectangles & Primes on September 15, 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.*