# Prime Checker vs Prime Cracker

The clearest difference is update cadence: Prime Cracker at every 2 weeks against Prime Checker's every 17 months. Prime Cracker also leads on ratings volume (31 vs 3). Prime Checker's advantage is iOS requirement (12.4 vs 15.0). On price, rating, review sentiment and ads there is nothing between them.

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

On the App Store both sit at effectively the same score — 5.0 for Prime Checker against 4.9 for Prime Cracker. That said, the two scores are not equally well evidenced: Prime Cracker has 31 ratings behind it against 3, so its average is the more settled of the two. Written reviews are what separate them: 96% of Prime Checker's written reviews are positive against 100% of Prime Cracker's.

Prime Checker ships an update every 17 months, Prime Cracker every 2 weeks. The most recent releases landed on August 29, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | Prime Checker | Prime Cracker |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/prime-checker/id389112910/reviews)** | [4.9 (31 ratings)](https://appshunter.io/ios/app/prime-cracker/id1281280649/reviews) |
| Number of ratings | 3 | **31** |
| Positive reviews | 95.8% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 17 months | **Every 2 weeks** |
| Monetization | Free | Free |
| Size | 3 MB | 6 MB |
| Requires iOS | **12.4** | 15.0 |
| Devices | iPhone, iPad, iPod, Apple Watch | **iPhone, iPad, iPod, Mac, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Heart Solutions, Inc.](https://appshunter.io/developer/389112913) | [Sven Freitag](https://appshunter.io/developer/1281280648) |

## 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


### Prime Cracker

[App page](https://appshunter.io/ios/app/prime-cracker/id1281280649)

This app helps users explore the fascinating world of prime numbers. It allows you to check if a number is prime, find its factors, and discover nearby primes. You can also analyze ranges of numbers for primes and twin primes.

**Highlights:** Determine primality and factors, Find prime position, Explore nearby primes, Check number ranges for primes, Identify twin primes

**In-app purchases:** none


## Frequently asked questions

### Is Prime Checker free?

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

### Is Prime Cracker free?

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

### Which has better reviews, Prime Checker or Prime Cracker?

Prime Checker is rated higher. Prime Checker averages 5.0 out of 5 from 3 ratings, while Prime Cracker averages 4.9 from 31 ratings.

### Do Prime Checker or Prime Cracker have ads?

Neither Prime Checker nor Prime Cracker shows ads.

### Which is updated more often, Prime Checker or Prime Cracker?

Prime Checker ships an update every 17 months, and Prime Cracker every 2 weeks. Most recently, Prime Checker was updated on August 29, 2026 and Prime Cracker on September 9, 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.*