iBunkoS Downloads & RevenueiBunkoS · App Store
iBunkoS is #3 in Books Paid in Japan and charting in 12 of 30 countries we track.
Updated 8 Nov 2026 · rankings refresh through the day
Full timeline · 19 events
- 📈iBunkoS charting in a new countryTaiwan
- 📈iBunkoS hit #1Top Paid · Books · JP
- ✏️iBunkoS: new screenshots4 screenshots (was 4) · CA
- ✏️iBunkoS: needs a newer iOSiOS 12.0 → iOS 15.0
- ✏️iBunkoS: new screenshots4 screenshots (was 4) · 4 countries
- ✏️iBunkoS: new screenshots4 screenshots (was 4) · 10 countries
- 📦iBunkoS updated to version 3.4.47- some bug fix
- 📈iBunkoS entered the top 10Top Paid · Books · KR
- 📈iBunkoS charting in a new countryVietnam
- 📈iBunkoS hit #1Top Paid · Books · ID
- 📈iBunkoS new best rank in the overall chart: #53Top Paid · All Apps · ID
- 📈iBunkoS entered the top 100 in 2 chartsTop Paid · All Apps · ID · Top Grossing · Books · ID
- 📈iBunkoS entered the top 100Top Paid · Books · US
- 📈iBunkoS charting in a new countryRussia
- 📈iBunkoS charting in a new country in 2 chartsBrazil · United States
- 🆕iBunkoS first spotted by AppInsider#18 in Top Paid · Books · Saudi Arabia
- 📦iBunkoS version 3.4.46No release notes
- 🆕iBunkoS: its developer released another app: QuizKnock schole
- 🆕iBunkoS released on the App Store
Collected from the stores by AppInsider since we first spotted the app. Dates are when we saw each change.
iBunkoS at a glance
AI summary written from our chart and store data, 2026-11-06. It can be wrong: check the numbers above.
iBunkoS is a paid iOS reading application designed for users who want to read novels, documents, and comic books with a realistic page-flipping interface and support for Japanese vertical text. The app holds strong positions in the Japanese Books Paid chart at #5, while maintaining moderate visibility in South Korea (#18) and scattered presence across European and Asian markets, indicating its primary relevance remains within Japan despite global availability.
Similar apps: KyBook, MangaZone, PDF Expert
iBunkoS on the App Store
App details
iBunkoS downloads
Worldwide, per day, and installs to date. The band is open; the exact number is free with an account.
How this is calculated
Where iBunkoS's downloads come from Modelled
Last 30 days: organic search, browsing the store, features and paid ads.
Active users
All platforms, worldwide. Free with an account.
How this is calculated
Where it ranks now
Every top chart it appears in across 30 countries.
| Country | Charts | Rank |
|---|---|---|
| BooksPaid | #3 | |
| BooksPaid | #14 | |
| BooksPaid | #169 | |
| BooksPaid | #17 | |
| BooksPaid | #87 | |
| BooksPaid | #86 | |
| BooksPaid | #70 | |
| BooksPaid | #134 | |
| BooksPaid | #87 | |
| BooksPaid | #157 | |
| BooksPaid | #130 | |
| BooksPaid | #71 |
Apps near iBunkoS on the chart
Books Paid, around #3.
Ratings
App Store, worldwide.
Review momentum
ⓘ How we measure thisReview momentum (0-100) blends how fast the app collects ratings compared with other apps in its category (60%), whether that pace is speeding up (25%) and what recent raters give it (15%; recent stars well below lifetime pull it down). Ratings counts are read daily. A jump usually means a launch, a feature, ads or a new review prompt.
What users say about iBunkoS
From the 12 most recent App Store reviews in the US.
Users highly praise the app's interface, customization options, and utility for Japanese study, particularly its text-to-speech feature. However, there are frequent requests for EPUB format support, cloud synchronization, and reports of recent bugs affecting stability and Dropbox login.
Mostly positive (92% of recent reviews give 4–5 stars). People like it for its features and content, and its design. Recent reviews are more positive than earlier ones.
What people like
- Features & content: “Would you mind adding a feature so that I can rename a book folder in a shelf manually?”
- Design: “Everything about this app is beautiful”
About iBunkoS
Thanks to a realistic interface, you can enjoy reading as you would with a real paper book. Reading on your iPhone is now easier than ever!
This is a great iPhone app for all the book lovers!
Read books and comics in vertical setting with comfort
・Support both horizontal (left open) and vertical (right open) writings.
・The app automatically detects the binding direction of a PDF document.
Double page spread and page effect
・When viewed landscape mode, the pages switch to the double page spread. The pages containing landscape format images are automatically treated as a double page spread.
・You can "flip" pages just like reading a real paper book.
Feature about 230 built-in books and "Aozora Bunko"
・ You can download a book with simple controls from "Aozora Bunko", the Japanese digital library that provides copyright-free Japanese literary works.
・ The app comes with the well-known books from "Aozora Bunko".
"Bookshelf" function
・Create a bookshelf as you need.
・You can easily choose a book you'd like to read by browsing the book covers displayed on the shelf.
"Bookmark" function
・You can place as many bookmarks as you want and add notes on it.
・Select text as a bookmark in order to highlight the sentence.
Supported file formats.
iBunkoS supports the following file formats as books:
- .txt, .pdf
- .zip, .rar (containing .txt or .jpg/.png files)
- .cbz, .cbr
Transfer files
・Transfer the files using iTunes 'File Sharing' via the USB cable as well as via Dropbox, SkyDrive, pogoplug, Box, SugarSync. The app also supports both the WebDAV and the FTP servers.
Utilize data from PDF
・Support the table of contents or hyperlinks on the file.
・Select and search words (when the data contains text).
・Using our own processing technology, app can select a Japanese words smoothly.
Smart screen design removing the white space
・Eliminate unnecessary white space for better readability on the screen.
Thumbnails of pages show quick reference for where you'd like to read
・List the page thumbnails at the bottom of the screen or in the full screen.
・The page with bookmarks will be attached a mark. You can also display only the page thumbnails which contain bookmarks.
History back pages
・Viewed pages are saved in history so you can easily go back to the previous page.
Look up words in the dictionary
・You can use the iPhone's built-in dictionary as well as other dictionary apps that support custom URL schemes.
・Just select text and tap the button to look up the word.
Passcode lock
・You can set passcode lock on specific bookshelves or the "folder" screen that stored transferred files.
Various page settings
・Available various settings such as enable/disable the flipping effect or change the position of the tap control.
・Customize your iBunkoS to suit your own preferences!
You will find many more convenient functions and settings.
Latest updates
Store changes
What iBunkoS changed on its store page: name, icon, screenshots, price, size, languages, requirements.
More from DWANGO Co., Ltd.
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