Comparison

BiLibre DjVu and PDF Reader vs Shor's algorithm

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

Head to head
About

BiLibre DjVu and PDF Reader

Read and organize technical, scientific, and educational literature in DjVu and PDF formats. Features include customizable reading modes, powerful annotation tools, a built-in summary editor, and advanced DjVu processing. Manage your library with smart cataloging and metadata editing.

Highlights
  • Customizable reading modes
  • Annotation and drawing tools
  • Summary editor with Markdown
  • DjVu text recognition
  • Full text searching
  • Library cataloging and metadata editing
  • Cloud synchronization
Features
Currently charting
Read full description

The application for reading and cataloging books, textbooks, reference books and documents in DjVu and PDF formats in a modern, user-friendly style. Designed mainly for working with technical, scientific and educational literature. COMFORTABLE READING MODE • Crops a page margins in manual and automatic mode. • Themes, color schemes for reading (day, night, sepia and more). • Page turn with scroll, curl and slide. POWERFUL ANNOTATIONS • Notes, stickers and scraps. • Drawn annotations (Apple Pencil support and just by touching). • Exports annotations in HTML, PDF, RTF formats. • Synchronization of annotations and drawings in iCloud. • Unified view and management of all annotations in all the books at once. BUILT-IN THE SUMMARY EDITOR • Markdown formatting. • Exports summaries in HTML, PDF, RTF formats. • Synchronization of summaries in iCloud. ADVANCED FEATURES FOR DJVU • Text recognition of pages in DjVu (for documents without OCR layer). • Splits a scanned double-page spread in DjVu into separate pages. WORKING WITH FRAGMENTS OF TEXT • Translation of separate words or complete sentences in different languages. • Full text searching in a book (textual, fuzzy and regular). • Built-in search for a selected text on the Internet, Wikipedia and Wolfram|Alpha. • Search for a word definition in a dictionary. • Text-to-speech in books. • Smart zoom by double-tap. CATALOGUER • Grouping by categories: by authors, subjects, sequences, publishers, tags, popular, recent, new, read and reading now. • Using tags to categorize documents. • Customizable search for books in the library by various metadata fields in different modes. • Search for textbooks on the Internet through arXiv.org, Library Genesis and Google. • Own folders tree and flexible bookshelf settings for layout and sorting. • Arranging books on a bookshelf by dragging. WORKING WITH A METADATA AND A TABLE OF CONTENTS OF A BOOK • Automated extraction of a metadata from PDF and DjVu. • Convenient editing of a metadata. • Editing and creating a table of contents in manual and automatic mode. • Synchronization of a metadata and a table of contents in iCloud. STORAGE • Locally on the device. • In the Cloud Storage (iCloud Drive, Google Drive, Yandex Disk). • Content server for accessing files on the device via a local network. • Import files from shared folders in the local network. • Export files.

About

Shor's algorithm

Features
Read full description

This app is a demonstration of Shor's algorithm. You can get some help to understand Shor's algorithm.

Screenshots

BiLibre DjVu and PDF Reader4 screens
Shor's algorithm2 screens

Verdict

The call

The clearest difference is price: Shor's algorithm at Free against BiLibre DjVu and PDF Reader's $1.99. BiLibre DjVu and PDF Reader's advantage is in-app purchases (none vs 3) and update cadence (every 10 days vs every 6 months). On ads 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

Shor's algorithm is free to download; BiLibre DjVu and PDF Reader costs $1.99 up front. Shor's algorithm sells 3 one-off in-app purchases. BiLibre DjVu and PDF Reader asks for nothing beyond the download.

UpkeepUpdate frequency

BiLibre DjVu and PDF Reader ships an update every 10 days, Shor's algorithm every 6 months. The most recent releases landed on October 24, 2026 and October 10, 2026 respectively.

Scorecard5 real differences · 6 level
BiLibre DjVu and PDF Reader versus Shor's algorithm: the parameters behind the verdict, then further details
ParameterBiLibre DjVu and PDF ReaderShor's algorithm
Price$1.99Free — better
Rating4.3 (103 ratings) — better—
Positive reviews41.1% of reviews—
Number of ratings103 — better—
Update frequencyEvery 10 days — betterEvery 6 months
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaid—
Best chart rank#190 — better—
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS10.0 — better16.0
Further details — not scored
Size57 MB7 MB
Age rating17+4+
DeveloperKonstantin BukreevSungjun Kim

In-app purchases

None

BiLibre DjVu and PDF Reader

No in-app purchases

3 purchases

Shor's algorithm

One-time3
  • coffee$0.99
  • latte$4.99
  • whopper set$9.99

Questions

Is BiLibre DjVu and PDF Reader free?
BiLibre DjVu and PDF Reader costs $1.99, with no in-app purchases.
Is Shor's algorithm free?
Shor's algorithm is free to download, with in-app purchases available.
Do BiLibre DjVu and PDF Reader or Shor's algorithm have ads?
Neither BiLibre DjVu and PDF Reader nor Shor's algorithm shows ads.
Which is updated more often, BiLibre DjVu and PDF Reader or Shor's algorithm?
BiLibre DjVu and PDF Reader ships an update every 10 days, and Shor's algorithm every 6 months. Most recently, BiLibre DjVu and PDF Reader was updated on October 24, 2026 and Shor's algorithm on October 10, 2026.

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