# iBunkoS

> Realistic digital book reader for novels, documents, and comics on iPhone. (iPhone/iPad app by DWANGO Co., Ltd..)

- Source: https://appshunter.io/ios/app/ibunkos/id418102178 (this page in markdown: same URL + `.md`)
- Developer: [DWANGO Co., Ltd.](https://appshunter.io/developer/297539595)
- Category: Books, Utilities
- Price: $2.99
- Rating: 4.40/5 from 9 App Store ratings · 47 written reviews indexed
- Age rating: 4+
- Requires: iOS 12.0 · 34 MB
- Languages: American English, Japanese, Chinese (Simplified, China)
- Released: 2011-02-25
- Data updated: 2026-08-25
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/ibunkos/id418102178/reviews.md

## What is iBunkoS?

iBunkoS provides you the best way to read novels, documents and comic books on iPhone.
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.

## Key features

- Realistic paper book interface
- Supports TXT, PDF, CBZ, CBR files
- 230+ built-in books and Aozora Bunko access
- Customizable bookshelf and bookmarks
- File transfer via USB, cloud, and servers
- Dictionary lookup integration
- Passcode lock for privacy

## Chart rankings

- #172 in Top Paid · Book (US App Store)

## Recent user reviews (10 of 47)

All indexed reviews: https://appshunter.io/ios/app/ibunkos/id418102178/reviews.md

### 1/5 — サーバーへの接続が…

*2026-05-05*

リーダーの機能としては問題ないですが、、、
FTPSに繋がらないし、
HTTPSのせいなのかTLSのせいなのか証明書のせいなのか、WebDAVにも繋まともにがらない…

その他の接続も仕様が古いみたいですね。
とても残念です。

### 5/5 — 大々的なアップデートが必要です。

*2026-01-04*

大々的なアップデートが必要です。

### 4/5 — 音声が

*2025-12-08*

散歩中にテキストの読み上げをしてもらっていましたが、iOS26になったら音声が劣化してしまいききにくくなりました。
修正入るといいなと思ってレビュー入れさせていただきます。
お気に入りのアプリです

### 5/5 — ちょっとした不具合

*2025-10-03*

iOS26で画面がダークモードの時、本棚を上下にスクロールすると本棚名が表示されている上部と画面切替のボタンがある下部が黒色から白色になります。
OSのバージョンの問題ですが、できれば修正してもらえると嬉しいです。

### 1/5 — NASに入れない

*2025-08-26*

Nasに入れるということで購入、入れないとわかり即使用を停止しました

SMB 1しか入れない等の話だと思いますがさすがに使い物にならない

お金をドブに捨てました

### 1/5 — SMB2、3に非対応

*2025-08-25*

NASに置いた自炊PDFにアクセスしたいのですが、セキリュティに問題があるSMB1プロトコルでしかアクセスできません。
SMB2,3への対応をお願いします。

### 4/5 — アプリケーション連携動かない

*2025-08-21*

令和7年になってアプリケーション連携が動かないです、とてもいいアプリなので動かして欲しいです。

### 5/5 — Could you put this app on Chinese App Store？

*2025-05-11*

Hello, i am Chinese, i want to buy this HD version on Chinese app store, but i can't find it, could you put this app on Chinese app store, thank you very much

### 4/5 — 使いやすい

*2025-05-04*

長年使用していますが、オンラインストレージだけでなく、iphone内部のフォルダへのアクセスを可能にして、外付けhddのファイルを読めるようにしてほしい。

### 1/5 — Dropboxが読めなくなった

*2025-02-02*

Dropboxに格納していた書類が読めなくなった
ログインしようとすると画面が真っ暗で、操作ができないためアプリを落とすしかない
青空文庫を読むことはできるが、それならもっと優れたリーダーがいくつもある

## Frequently asked questions about iBunkoS

### What file formats does iBunkoS support?

iBunkoS supports .txt, .pdf, .zip, .rar (containing .txt or .jpg/.png files), .cbz, and .cbr files. It can also utilize data from PDFs, including tables of contents and hyperlinks.

### How can I transfer books to iBunkoS?

You can transfer files using iTunes 'File Sharing' via USB, or through cloud services like Dropbox, SkyDrive, Box, and SugarSync. It also supports WebDAV and FTP servers.

### Does iBunkoS have ads?

No, iBunkoS does not contain advertisements. It is a paid application designed for an uninterrupted reading experience.

### What is the price of iBunkoS?

iBunkoS is a paid application priced at $2.99. This one-time purchase grants you access to all its features.

### Can I organize my books in iBunkoS?

Yes, iBunkoS features a 'Bookshelf' function that allows you to create custom shelves and browse your books by their covers. You can also place an unlimited number of bookmarks with notes.

### Is iBunkoS suitable for children?

iBunkoS has an age rating of 4+, making it suitable for younger users. The app provides a safe and customizable reading environment.

### How often is iBunkoS updated?

The latest version of iBunkoS is 3.4.42, last updated on January 8, 2026. Updates typically include new features, bug fixes, and performance improvements.

### Can I look up words in iBunkoS?

Yes, iBunkoS allows you to look up words directly from the text using your iPhone's built-in dictionary or other compatible dictionary apps. Simply select the text and tap the lookup button.

## Version history (last 5 releases)

### 3.4.45 — 2026-07-23

- some bug fix

### 3.4.44 — 2026-07-21

- some bug fix

### 3.4.43 — 2026-07-14

- some bug fix
- support smb2

### 3.4.42 — 2026-01-08

- minor bug fixes

### 3.4.41 — 2025-09-29

- Minor bug fixes

## Apps similar to iBunkoS

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [neo文庫](https://appshunter.io/ios/app/neo/id525695233) | — | $3.99 | Books |
| [ComicShare - Streaming Reader](https://appshunter.io/ios/app/comicshare-streaming-reader/id642097030) | 4.4 (48) | $3.99 | Books |
| [Booklover - eBook Reader](https://appshunter.io/ios/app/booklover-ebook-reader/id949207089) | 4.6 (57) | $3.99 | Books |
| [SORARI - nonAD](https://appshunter.io/ios/app/sorari-nonad/id1587550683) | — | $1.99 | Books |
| [ComicGlass](https://appshunter.io/ios/app/comicglass/id363992049) | 4.3 (61) | $3.99 | Books |
| [読書尚友 - 青空文庫ビューア](https://appshunter.io/ios/app/id1579254502) | 4.0 (1) | Free | Books |

## More apps by DWANGO Co., Ltd.

- [ニコニコ動画-アニメやボカロ動画が見放題の動画アプリ](https://appshunter.io/ios/app/id307764057)
- [iBunkoHD](https://appshunter.io/ios/app/ibunkohd/id369111608)
- [Vocacolle](https://appshunter.io/ios/app/vocacolle/id421753493)
- [ニコニコ生放送 ライブ配信/ゲーム配信アプリ](https://appshunter.io/ios/app/id823479272)
- [ZEN Study(旧N予備校) 学ぶ全世代へ ゼンスタディ](https://appshunter.io/ios/app/zen-studyn/id1082669389)

All apps by DWANGO Co., Ltd.: https://appshunter.io/developer/297539595

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-25.*