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54
BU Score
Solid

BiLibre DjVu and PDF Reader

4.3 ✍️ Editor
✍️ BU Analytics Review

BiLibre DjVu and PDF Reader is an iOS app from Konstantin Bukreev in the News category, currently rated 4.3★ across 103 ratings. Initial signal reads as mostly critical sentiment so far — users flag rough edges and unmet expectations.

Our BU Score puts it at 54Solid (established niche player). For a News app, that means established niche player.

Track changes month-over-month in the Performance section below — live snapshot history and revenue forecast included.

📊 Performance Tracking LIVE

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0%
Rating
Reviews
Forecast Revenue / mo
Snapshots tracked
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since first record
Range:

💰 Forecast Revenue / mo

MODEL
Revenue forecast computed from BU's 234 trigger model on each snapshot. Calibrated against ground-truth from 58 verified-revenue apps.
🔬Forecast Breakdown — Why This Estimate?Top 4 of 4 triggers
Our ML model uses 200+ signals from public data. These are the most influential for this app:
Paid app ($0.00)METRIC
+$2,800
Mature app (8y old)METRIC
+$1,500
Good rating (4.3★)METRIC
+$800
Early-stage install base (103 ratings)METRIC
+$400
METRIC = structural app data · REVIEW = mined from user reviews · ✓ VERIFIED = Stripe-verified anchor (TrustMRR)

📈 Reviews Growth

LIVE
Cumulative review count from first BU snapshot. Each point = a tracked update.
💚Sentiment Over Time↑ green = positive · ↓ red = negative
Jul 24
Oct 24
Dec 24
Oct 25

⭐ Rating Trend

LIVE
Average rating evolution. Updates with each new review batch.

🗓️ Snapshot Timeline

HISTORY
Each bar shows a tracked update and the metric delta from the previous snapshot.
App Specs
🔐 Own this app? Claim & verify MRR →
💾 57 MB🔞 17+📱 iOS 10.0+🔖 v0.6.1🔄 updated 8y ago🌐 EN, RU📂 News💰 Paid🚀 Launched 2017 (8y old)

📝 About this app

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.

🆕 What's New · v0.6.1

This update from Apple will improve the functionality of this app. No new features are included.

Fixed an error occurring when using the translation service.

Profile & Insights

Everything we know — and don't — about this app and its company.

Identification

App name
BiLibre DjVu and PDF Reader
Developer
Konstantin Bukreev
Bundle ID
com.kolyvan.tabula
App Store URL
Open in App Store
Category
News
Content rating
17+
Languages
EN, RU

Company

Website
kolyvan.com
Tagline
kolyvan.com
Description
Kolyvan Site
Founded
Not found
HQ / Address
Not found
Employees
Not found
Logo
Not found

Revenue

Verified revenue / mo
Not found
AI revenue estimate / mo
Not found
AI annual estimate
Not found
ML model estimate / mo
$86/mo
Top-grossing rank
Outside top 100 in US News
All-time revenue
Not found
Pricing
Not found

Founder

Name
Not found
X / Twitter
Not found
LinkedIn
Not found
GitHub
http://github.com/kolyvan
X followers
Not found
Public statements
Not found

Funding

Total raised
Not found
Last round
Not found
Investors
Not found
Crunchbase
Not found
AngelList
Not found

Press & Links

Articles found
Not found
Listed on
Not found
Blog
Not found
Press / News
Not found

Contacts & Socials

Socials
github
Email
Not found
Phone
Not found
Contact page
Not found
About page
Not found
📈Ratings growth103 ratings+10200% lifetimeShow 3-year history estimate ▾Jun 2017Jul 2024May 2026
Tracked (16 weeks) Pre-tracking estimate (37 weeks) · model-based, ±5% noise · anchored to release date and current value
🌍Geographic ReachNot ranked
This app is currently outside the top 100 grossing in all 9 countries we monitor (US, UK, DE, FR, JP, CA, AU, BR, IN). Niche or new apps often launch this way — popularity rankings appear once daily revenue clears the regional threshold.
Profile is built from iTunes Lookup + developer site scrape + ML revenue model. Empty fields show "Not found" — additional sources (Crunchbase, X, IndieHackers, Acquire.com) coming.
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