# CheckPrimeNumbers vs PFD Calc

The clearest difference is price: PFD Calc at Free against CheckPrimeNumbers's $0.99. CheckPrimeNumbers's advantage is ads (none vs shown). On in-app purchases, device support and iOS requirement there is nothing between them.

PFD Calc is free to download; CheckPrimeNumbers costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | CheckPrimeNumbers | PFD Calc |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | — | Every 5 weeks |
| Size | 0 MB | 14 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Sreekanth Parigela](https://appshunter.io/developer/1763791561) | [Kazuhisa Kobayashi](https://appshunter.io/developer/1580882000) |

## What reviewers say

### CheckPrimeNumbers

[App page](https://appshunter.io/ios/app/checkprimenumbers/id6670205769)

**Features:** macOS Compatibility

**In-app purchases:** none


### PFD Calc

[App page](https://appshunter.io/ios/app/pfd-calc-prime-factorization/id6737405828)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is CheckPrimeNumbers free?

CheckPrimeNumbers costs $0.99, with no in-app purchases.

### Is PFD Calc free?

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

### Do CheckPrimeNumbers or PFD Calc have ads?

PFD Calc shows ads; CheckPrimeNumbers does not.

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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.*