Make local reading of scanned and digital books
more comfortable, more free.
A local-first design that safely analyzes and renders book content on your device. Enjoy a refined Japanese-modern UI with voice and gesture navigation for stress-free reading.
* Switch with one tap between a cover-based wood bookshelf and a list that shows size and reading %
Two shelf views to match your style
Switch with one tap between a warm “wood bookshelf” for browsing covers and a “list view” that clearly shows file size (MB), author, and reading progress (%).
Four reasons people choose BOOK-BOOK Chagama
Thoughtful features for privacy-minded readers and self-scanned book users
Fully local-first design
Bookshelf data, reading history, OCR text, and voice data are all processed on device. No unintended uploads to the cloud.
Wide format support
Open major formats like ZIP, CBZ, RAR, CBR, PDF, EPUB, and TXT directly—no unzipping required before adding them to your shelf.
Vosk offline voice control
Even offline, jump pages fast with commands like “go to page 100” or “skip 20 pages”—ideal when your hands are busy.
3D curl & image correction
Paper-like 3D page turns plus contrast, brightness, and grayscale controls improve reading quality for scanned books.
Key Features
Designed for stress-free scanned-book reading
Smooth loading & smart prefetch
Background prefetch reduces wait time when turning pages or seeking—for a smoother reading flow.
Fast flip & two-finger swipe skip
Long-press for a rapid page preview like flipping paper. Two-finger swipe skips a set number of pages to reach your target faster.
Slideshow auto-advance
Automatically turn pages on a timer—great for art books, skimming documents, or hands-free reading.
Vosk hands-free voice nav
Beyond next/previous, say commands like “skip 10 pages” or “jump to page 100” and move by voice alone.
Display & contrast tuning
Darken faint scanned text, adjust margins, and tune brightness/contrast for comfortable reading.
Pattern-based title & volume sorting
Define your own filename rules (including regex patterns) to neatly organize titles and volumes.
Useful Tools
Even more helpful features
Reading statistics
Automatically track daily reading time and total pages read to understand your pace.
Handwriting & annotations
Write notes directly on pages—useful for study materials and reference books.
OCR search & text-to-speech
Extract text from image-based books on device for keyword search and audio playback.
* Text-to-speech depends on OCR accuracy; results may vary with image resolution and text quality.
Plans
Licenses & feature comparison
Basic viewing is free. Paid plans can also be purchased from My Page on the web.
| Features | Free Basic | Pro license Paid |
|---|---|---|
| Basic Viewer / TOC & BookmarksPDF/image display, table of contents, bookmarks, reading history. | ✓ | ✓ |
| Slide AnimationAuto page advance with configurable timer. | ✓ | ✓ |
| Curl Animation3D page-curl effect like real paper. | ✓ | ✓ |
| Reading Direction / Spread / QualityReading direction, spread mode, image quality settings. | ✓ | ✓ |
| Basic Page Turn / PinchTap/swipe page turns and pinch zoom. | ✓ | ✓ |
| Password LockProtect your books with a password for privacy. | ✓ | |
| Cover change (Custom Thumbnail)Set cover from any page, local image, or web image. | ✓ | |
| Smart Book CoverAuto-find cover art from title/author and set it as the thumbnail. | ✓ | |
| Margin CropAuto or manual crop of white margins for larger text. | ✓ | |
| Long-press Fast FlipRapid page flipping via long-press gesture. | ✓ | |
| Two-finger SwipeCustom shortcuts via two-finger swipe gestures. | ✓ | |
| HandwritingPen and marker drawing on Canvas with stroke persistence. | ✓ | |
| Text-to-Speech (TTS)OS TTS engine for reading text aloud. | ✓ | |
| Voice Commands (Vosk)Hands-free control via microphone voice recognition. | ✓ | |
| On-device OCR (ML Kit)Extract text from images on-device. | ✓ | |
| OCR Full-text SearchKeyword search across OCR-extracted text. | ✓ |
FAQ
Frequently asked questions