# Prime Checker vs Prime Number Checker

The clearest difference is update cadence: Prime Number Checker at every 5 weeks against Prime Checker's every 17 months. Prime Number Checker also leads on iOS requirement (9.0 vs 12.4). Prime Checker's advantage is device support (4 vs 2). On price, ads 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 ships an update every 17 months, Prime Number Checker every 5 weeks. The most recent releases landed on September 29, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | Prime Checker | Prime Number Checker |
| --- | --- | --- |
| 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 5 weeks** |
| Monetization | Free | — |
| Size | 3 MB | 10 MB |
| Requires iOS | 12.4 | **9.0** |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Heart Solutions, Inc.](https://appshunter.io/developer/389112913) | [Adam Thuvesen](https://appshunter.io/developer/1110341546) |

## 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 Number Checker

[App page](https://appshunter.io/ios/app/prime-number-checker/id1114293126)

**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 Prime Number Checker free?

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

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

Neither Prime Checker nor Prime Number Checker shows ads.

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

Prime Checker ships an update every 17 months, and Prime Number Checker every 5 weeks. Most recently, Prime Checker was updated on September 29, 2026 and Prime Number Checker on October 3, 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.*