# Prime Checker vs Memorize Prime Numbers

The clearest difference is review sentiment: Prime Checker at 96% against Memorize Prime Numbers's 50%. Prime Checker also leads on rating (5.0 vs 3.0) and ads (none vs shown). On price, ratings volume, update cadence 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.

Prime Checker holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 3 and 2 respectively. Written reviews point the same way: 96% of Prime Checker's written reviews are positive against 50% of Memorize Prime Numbers's.

Prime Checker ships an update every 17 months, Memorize Prime Numbers every 14 months. The most recent releases landed on September 29, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Prime Checker | Memorize Prime Numbers |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/prime-checker/id389112910/reviews)** | [3.0 (2 ratings)](https://appshunter.io/ios/app/memorize-prime-numbers/id6475699754/reviews) |
| Number of ratings | **3** | 2 |
| Positive reviews | **95.8% of reviews** | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 17 months | **Every 14 months** |
| Monetization | **Free** | Ad-supported |
| Size | 3 MB | 84 MB |
| Requires iOS | **12.4** | 16.6 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Heart Solutions, Inc.](https://appshunter.io/developer/389112913) | [Oscar Tsang](https://appshunter.io/developer/416987065) |

## 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


### Memorize Prime Numbers

[App page](https://appshunter.io/ios/app/memorize-prime-numbers/id6475699754)

Learn to memorize hundreds of prime numbers within a week using a provided method. This app offers a unique approach to remembering these special numbers.

**Highlights:** Memorize hundreds of prime numbers, Learn a provided memorization method, Focus on prime number recall, Suitable for quick learning

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

**In-app purchases:** none


## Frequently asked questions

### Is Prime Checker free?

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

### Is Memorize Prime Numbers free?

Memorize Prime Numbers is free to download, with no in-app purchases.

### Which has better reviews, Prime Checker or Memorize Prime Numbers?

Prime Checker is rated higher. Prime Checker averages 5.0 out of 5 from 3 ratings, while Memorize Prime Numbers averages 3.0 from 2 ratings.

### Do Prime Checker or Memorize Prime Numbers have ads?

Memorize Prime Numbers shows ads; Prime Checker does not.

### Which is updated more often, Prime Checker or Memorize Prime Numbers?

Prime Checker ships an update every 17 months, and Memorize Prime Numbers every 14 months. Most recently, Prime Checker was updated on September 29, 2026 and Memorize Prime Numbers 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.*