BiLibre DjVu and PDF Reader vs Lambda calculus
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Customizable reading modes
- Annotation and drawing tools
- Summary editor with Markdown
- DjVu text recognition
- Full text searching
- Library cataloging and metadata editing
- Cloud synchronization
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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.
Lambda calculus
Learn the fundamentals of lambda calculus with this educational application. Gain a basic understanding of this important mathematical concept through an introductory experience.
- Introduction to lambda calculus
- Basic understanding of concepts
- Educational content
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This app introduces lambda calculus. You can have some understanding for lambda calculus.
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Verdict
The clearest difference is review sentiment: Lambda calculus at 100% against BiLibre DjVu and PDF Reader's 41%. Lambda calculus also leads on price (Free vs $1.99). BiLibre DjVu and PDF Reader's advantage is rating (4.3 vs 3.3) and ratings volume (103 vs 3). 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
Lambda calculus is free to download; BiLibre DjVu and PDF Reader costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
BiLibre DjVu and PDF Reader holds the better App Store score, 4.3 against 3.3. That said, the two scores are not equally well evidenced: BiLibre DjVu and PDF Reader has 103 ratings behind it against 3, so its average is the more settled of the two. Written reviews complicate that: 41% of BiLibre DjVu and PDF Reader's written reviews are positive against 100% of Lambda calculus's, so the app with the better star average is not the one people write more warmly about.
| Parameter | BiLibre DjVu and PDF Reader | Lambda calculus |
|---|---|---|
| Price | $1.99 | Free — better |
| Rating | 4.3 (103 ratings) — better | 3.3 (3 ratings) |
| Positive reviews | 41.1% of reviews | 100.0% of reviews — better |
| Number of ratings | 103 — better | 3 |
| Update frequency | Every 10 days | — |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 10.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 57 MB | 5 MB |
| Age rating | 17+ | 4+ |
| Developer | Konstantin Bukreev | Sungjun Kim |
Customer experience
BiLibre DjVu and PDF Reader
Lambda calculus
In-app purchases
BiLibre DjVu and PDF Reader
No in-app purchases
Lambda calculus
No in-app purchases
Questions
Is BiLibre DjVu and PDF Reader free?
Is Lambda calculus free?
Which has better reviews, BiLibre DjVu and PDF Reader or Lambda calculus?
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