# UriViewer vs PFD Calc

The clearest difference is ads: UriViewer at none against PFD Calc's shown. UriViewer also leads on update cadence (every 2 weeks vs every 5 weeks). On price, in-app purchases, device support and iOS requirement there is nothing between them.

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

UriViewer ships an update every 2 weeks, PFD Calc every 5 weeks. The most recent releases landed on October 2, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | UriViewer | PFD Calc |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Every 2 weeks** | Every 5 weeks |
| Size | 63 MB | 14 MB |
| Requires iOS | **14.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [kang sungheng](https://appshunter.io/developer/1328004941) | [Kazuhisa Kobayashi](https://appshunter.io/developer/1580882000) |

## What reviewers say

### UriViewer

[App page](https://appshunter.io/ios/app/uriviewer/id1328004942)

**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 UriViewer free?

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

### Is PFD Calc free?

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

### Do UriViewer or PFD Calc have ads?

PFD Calc shows ads; UriViewer does not.

### Which is updated more often, UriViewer or PFD Calc?

UriViewer ships an update every 2 weeks, and PFD Calc every 5 weeks. Most recently, UriViewer was updated on October 2, 2026 and PFD Calc on October 5, 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.*