
69
BU Score
Solid
PDF Reader: PDF Viewer+Folders
✍️ BU Analytics Review
“
PDF Reader: PDF Viewer+Folders is an Android app from Librera in the Books & Reference category, currently rated 4.3★ across 13,769 ratings. Initial signal reads as largely positive sentiment, users highlighting consistency and feature depth.
Our BU Score puts it at 69 — Solid (established niche player). For a Books & Reference app, that means established niche player.
Track changes month-over-month in the Performance section below — live snapshot history and revenue forecast included.
creator
📊 Performance Tracking LIVE
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Rating
—
Reviews
—
Forecast Revenue / mo
—
Snapshots tracked
0
since first record
Range:
💰 Forecast Revenue / mo
MODELRevenue 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:
| Mid install base (13,769 ratings)METRIC | +$5,500 | |
| Good rating (4.3★)METRIC | +$800 | |
| Established app (7y old)METRIC | +$800 | |
| Ad-supported / freemiumMETRIC | +$600 |
METRIC = structural app data · REVIEW = mined from user reviews · ✓ VERIFIED = Stripe-verified anchor (TrustMRR)
📈 Reviews Growth
LIVECumulative review count from first BU snapshot. Each point = a tracked update.
⭐ Rating Trend
LIVEAverage rating evolution. Updates with each new review batch.
🗓️ Snapshot Timeline
HISTORYEach bar shows a tracked update and the metric delta from the previous snapshot.
App Specs
🔐 Own this app? Claim & verify MRR →🔖 v9.3.72🔄 updated 1mo ago📂 Books & Reference💰 Free📺 Ad-supported🚀 Launched 2018 (7y old)
📝 About this app
<b>PDF Reader</b> is one of the best reading tools. It can help you to easily manage and open all the ebooks on your phone.
Supports ebook formats: PDF, DjVU, XPS (OpenXPS), FictionBook (fb2 and fb2.zip), Comics Book formats (cbr and cbz), EPUB, EPUB 3, MOBI, AZW, AZW3 and LibreOffice, OpenOffice (ODT, RTF)
<b>Key features of PDF Reader:</b>
* Pages or scroll view. Page flipping animation.
* Text to Speech (TTS) support in PDF
* Table of contents, bookmarks, text search.
* Bookmarks on text fragments (comments or corrections) - useful for proof reading.
* Export of bookmarks to text file.
* Built-in file browser, quick recent books access.
* Online catalogs (OPDS) support.
* Night reading mode
* Hyphenation dictionaries;
* Most complete FB2 format support: styles, tables, footnotes.
* Additional fonts support (place .ttf to /sdcard/fonts/)
* Support for Chinese, Japanese, Korean languages; autodetection of TXT file encoding (GBK, Shift_JIS, BIG5, EUC_KR).
* Day and night profiles (two sets of colors, background, backlight levels).
* Brightness adjustments by flick on left edge of the screen.
* Background texture (stretched or tiled) or solid color.
* Paperbook-like page turning animation or "sliding page" animation.
* Dictionary support with PDF books (ColorDict, GoldenDict, Fora Dictionary, Aard Dictionary).
* Customizable tap zone and key actions.
* Autoscroll (automatic page flipping) - start using menu/goto/autoscroll or assign action Autoscroll on key or tap zone; Change speed using volume keys or bottom-right and bottom-left tap zones; stop - tap any other tap zone or key.
* Can read books from zip archives.
* Automatic reformatting of .txt files (autodetect headings etc.)
* Styles can be customized in a wide range using external CSS.
* Select text using double tap (optional).
Disclaimer:
This app is base on Librera code and licensed under the GNU General Public License.
Supports ebook formats: PDF, DjVU, XPS (OpenXPS), FictionBook (fb2 and fb2.zip), Comics Book formats (cbr and cbz), EPUB, EPUB 3, MOBI, AZW, AZW3 and LibreOffice, OpenOffice (ODT, RTF)
<b>Key features of PDF Reader:</b>
* Pages or scroll view. Page flipping animation.
* Text to Speech (TTS) support in PDF
* Table of contents, bookmarks, text search.
* Bookmarks on text fragments (comments or corrections) - useful for proof reading.
* Export of bookmarks to text file.
* Built-in file browser, quick recent books access.
* Online catalogs (OPDS) support.
* Night reading mode
* Hyphenation dictionaries;
* Most complete FB2 format support: styles, tables, footnotes.
* Additional fonts support (place .ttf to /sdcard/fonts/)
* Support for Chinese, Japanese, Korean languages; autodetection of TXT file encoding (GBK, Shift_JIS, BIG5, EUC_KR).
* Day and night profiles (two sets of colors, background, backlight levels).
* Brightness adjustments by flick on left edge of the screen.
* Background texture (stretched or tiled) or solid color.
* Paperbook-like page turning animation or "sliding page" animation.
* Dictionary support with PDF books (ColorDict, GoldenDict, Fora Dictionary, Aard Dictionary).
* Customizable tap zone and key actions.
* Autoscroll (automatic page flipping) - start using menu/goto/autoscroll or assign action Autoscroll on key or tap zone; Change speed using volume keys or bottom-right and bottom-left tap zones; stop - tap any other tap zone or key.
* Can read books from zip archives.
* Automatic reformatting of .txt files (autodetect headings etc.)
* Styles can be customized in a wide range using external CSS.
* Select text using double tap (optional).
Disclaimer:
This app is base on Librera code and licensed under the GNU General Public License.
Profile & Insights
Everything we know — and don't — about this app and its company.
Identification
- App name
- PDF Reader: PDF Viewer+Folders
- Developer
- Librera
- Bundle ID
- pdf.pdf.reader
- App Store URL
- Open in App Store
- Category
- Books & Reference
- Content rating
- Not found
- Languages
- Not found
Company
- Website
- librera.mobi
- Tagline
- Not found
- Description
- Not found
- 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
- $1.4K/mo
- Top-grossing rank
- Not found
- All-time revenue
- Not found
- Pricing
- Not found
Founder
- Name
- Not found
- X / Twitter
- Not found
- Not found
- GitHub
- Not found
- 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
- Not found
- Not found
- Phone
- Not found
- Contact page
- Not found
- About page
- Not found
📈Ratings growth13,769 ratings+93% lifetimeShow 3-year history estimate ▾
Tracked (1 weeks) Pre-tracking estimate (37 weeks) · model-based, ±5% noise · anchored to release date and current value
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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