UriViewer vs PFD Calc
Price, ratings, monetisation and update history for both apps, side by side โ with what reviewers say about each.
UriViewer
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This is viewer for epub3. All contents supports for education. There are many useful functions. User can view the e-Book including PDF and EPUB3. The viewer has some serviceable functions, such as bookmark, thumbnail and comment, and has the writing functions including pen and eraser.
PFD Calc
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The app calculates prime factorization.
Screenshots
Verdict
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.
Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS
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.
| Parameter | UriViewer | PFD Calc |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 2 weeks โ better | Every 5 weeks |
| Ads | No โ better | Yes |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 14.0 โ better | 15.0 |
| Further details โ not scored | ||
| Size | 63 MB | 14 MB |
| Age rating | 4+ | 4+ |
| Developer | kang sungheng | Kazuhisa Kobayashi |
In-app purchases
UriViewer
No in-app purchases
PFD Calc
No in-app purchases
Questions
Is UriViewer free?
Is PFD Calc free?
Do UriViewer or PFD Calc have ads?
Which is updated more often, UriViewer or PFD Calc?
Other comparisons
