# Leviathan vs Bookoscope

The clearest difference is update cadence: Bookoscope at every 5 days against Leviathan's every 11 months. Bookoscope also leads on price ($2.99 vs $3.99) and iOS requirement (13.0 vs 15.6). On ads, in-app purchases and device support there is nothing between them.

Leviathan costs $3.99 and Bookoscope $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Leviathan ships an update every 11 months, Bookoscope every 5 days. The most recent releases landed on September 18, 2026 and September 11, 2026 respectively.

## The numbers

| Metric | Leviathan | Bookoscope |
| --- | --- | --- |
| Price | $3.99 | **$2.99** |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/bookoscope-opds-crawler/id6476512234/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 11 months | **Every 5 days** |
| Monetization | — | Paid |
| Size | 49 MB | 35 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 12+ |
| Developer | [Zarfhome Software Consulting](https://appshunter.io/developer/457956106) | [Isaac Lyman](https://appshunter.io/developer/1644594506) |

## What reviewers say

### Leviathan

[App page](https://appshunter.io/ios/app/leviathan-interactive-comic/id6444325089)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Bookoscope

[App page](https://appshunter.io/ios/app/bookoscope-opds-crawler/id6476512234)

Browse and download public domain ebooks or access your own self-hosted library. This app crawls OPDS endpoints, caches book data, and allows quick export to your preferred ereader.

**Highlights:** Browse self-hosted ebook libraries, Download public domain classics, Searchable by metadata, Cached feeds, Quick download and export, Compatible with Calibre-web, Kavita, Ubooquity

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Leviathan free?

Leviathan costs $3.99, with no in-app purchases.

### Is Bookoscope free?

Bookoscope costs $2.99, with no in-app purchases.

### Do Leviathan or Bookoscope have ads?

Neither Leviathan nor Bookoscope shows ads.

### Which is updated more often, Leviathan or Bookoscope?

Leviathan ships an update every 11 months, and Bookoscope every 5 days. Most recently, Leviathan was updated on September 18, 2026 and Bookoscope on September 11, 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.*