# EPUB Viewer Pro vs Diametric Builds

The clearest difference is update cadence: Diametric Builds at every 2 weeks against EPUB Viewer Pro's every 5 months. EPUB Viewer Pro's advantage is device support (4 vs 2). On price, ads, in-app purchases 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.

EPUB Viewer Pro ships an update every 5 months, Diametric Builds every 2 weeks. The most recent releases landed on November 3, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | EPUB Viewer Pro | Diametric Builds |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.4 (14 ratings)](https://appshunter.io/ios/app/epub-viewer-pro/id1572239625/reviews)** | — |
| Number of ratings | **14** | — |
| Positive reviews | 84.1% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 2 weeks** |
| Monetization | Free | — |
| Size | 3 MB | 39 MB |
| Requires iOS | 13.0 | **12.4** |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [青青 余](https://appshunter.io/developer/633344484) | [MARKS DZYN PRIVATE LIMITED](https://appshunter.io/developer/1615364323) |

## What reviewers say

### EPUB Viewer Pro

[App page](https://appshunter.io/ios/app/epub-viewer-pro/id1572239625)

Easily read EPUB files with this specialized application. It offers a convenient, fast, and safe reading experience for your digital books. A Mac version is also available for enhanced functionality.

**Highlights:** Read EPUB files, Convenient reading, Fast performance, Safe usage, Mac version available

**Features:** Vision Pro support

**In-app purchases:** none


### Diametric Builds

[App page](https://appshunter.io/ios/app/diametric-builds/id6743006508)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is EPUB Viewer Pro free?

EPUB Viewer Pro is free to download, with no in-app purchases.

### Is Diametric Builds free?

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

### Do EPUB Viewer Pro or Diametric Builds have ads?

Neither EPUB Viewer Pro nor Diametric Builds shows ads.

### Which is updated more often, EPUB Viewer Pro or Diametric Builds?

EPUB Viewer Pro ships an update every 5 months, and Diametric Builds every 2 weeks. Most recently, EPUB Viewer Pro was updated on November 3, 2026 and Diametric Builds on October 30, 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.*