Comparison

Leviathan vs Bookoscope

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Leviathan

Features
Read full description

LEVIATHAN: an interactive comic by Jason Shiga A seaside village – and a monstrous threat. Explore as you choose, by day or by night. Can you unravel the secrets of history and defeat the Leviathan? LEVIATHAN is not an ordinary comic. YOU make the choices that determine how the story unfolds. LEVIATHAN splits off into hundreds of different adventures. - A thrilling adventure of monsters, myths, and magic on the high seas (and the islands in between them). - Completely redesigned by the author for an infinite scrollable canvas. - Full audio accessibility with VoiceOver; every panel and choice can be spoken.

About

Bookoscope

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
Read full description

Bookoscope is a fast, searchable ebook catalog. With Bookoscope, you can browse your own self-hosted ebook library as well as download public domain classics from Project Gutenberg. FEATURES: - Fast - Easy on the eyes - Includes over 70,000 public domain books from Project Gutenberg - Uses cached feeds (refresh on demand) - Searchable by any available metadata - Quick download and export to the ereader of your choice COMPATIBLE WITH: - Calibre-web - Kavita - Ubooquity - Any ebook server with OPDS 1.0 functionality WHY USE BOOKOSCOPE? Some ereader apps can connect to OPDS endpoints, but the functionality is tucked away and awkward. There's no way to browse and search all the ebooks you have access to, all at once. Bookoscope fills that niche. It crawls your OPDS endpoints, finds and caches all the books it can, and lets you easily download any of them to your device. From there, you can export them to your preferred ereader. BOOKOSCOPE IS NOT: - An ebook reader, sync client, or annotator, like Apple Books, Google Books, or Kindle. - A metadata editor or organizer, like Calibre. - A self-hosted ebook server, like Kavita, Ubooquity, or calibre-web. Bookoscope may be used with any of the above, but is not affiliated with any other app or tool. WHAT IS OPDS? OPDS is the open standard for web endpoints that expose catalogs of ebooks. Many people use home OPDS servers for their personal ebook libraries. WHAT IF I DON'T HAVE AN OPDS SERVER? That's okay! You can use Bookoscope to browse and download free, completely legal books in the public domain. Start with classics like: - Moby Dick - Frankenstein - Pride and Prejudice - The Great Gatsby - The complete works of William Shakespeare, Charles Dickens, Frederick Douglass, and more!

Screenshots

Leviathan4 screens
Bookoscope4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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

UpkeepUpdate frequency

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.

Scorecard3 real differences · 7 level
Leviathan versus Bookoscope: the parameters behind the verdict, then further details
ParameterLeviathanBookoscope
Price$3.99$2.99 — better
Rating—5.0 (1 ratings) — better
Positive reviews—0.0% of reviews
Number of ratings—1 — better
Update frequencyEvery 11 monthsEvery 5 days — better
AdsNoNo
In-app purchasesNoNo
Monetization—Paid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.613.0 — better
Further details — not scored
Size49 MB35 MB
Age rating12+12+
DeveloperZarfhome Software ConsultingIsaac Lyman

In-app purchases

None

Leviathan

No in-app purchases

None

Bookoscope

No in-app purchases

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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