iBunkoHD vs Umizaru
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
iBunkoHD
Experience reading novels, documents, and comic books with a realistic interface that mimics a physical book. Organize your library with a bookshelf, add notes to bookmarks, and easily transfer files from various cloud services. Enjoy enhanced readability with smart screen design and quick page navigation.
- Realistic paper book interface
- Vertical and horizontal writing support
- Double page spread view
- Built-in Aozora Bunko library access
- Customizable bookshelf organization
- Bookmark with notes and text selection
- Multiple file format support (.txt, .pdf, .zip, .rar, .cbz, .cbr)
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iBunkoHD provides you the best way to read novels, documents and comic books on iPad. Thanks to a realistic interface, you can enjoy reading as you would with a real paper book. Reading on your iPad is now easier than ever! This is a great iPad app for all the book lovers! Won Good Design Award 2010 Ranked #1 in the Japanese App Store in 2010 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. iBunkoHD 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 iPad'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. Support Bluetooth keyboards ・You can read without touching the screen by using the compatible device. 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 iBunkoHD to suit your own preferences! You will find many more convenient functions and settings.
Umizaru
Experience the acclaimed Japanese comic series "Umizaru" on your iPhone or iPad. Follow the thrilling adventures of Coast Guard officers as they tackle sea disaster accidents. The first volume is available for free, with subsequent volumes offered for purchase.
- Digital comic reader
- First volume free
- Purchase subsequent volumes
- Based on popular manga
- Features Coast Guard stories
- Adapted into movies and dramas
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The familiar work in movies and dramas! The masterpiece, "Umizaru," finally comes up as an iPhone / iPad app! It is the elaborating work by Shuho Sato, who is famous with his works, "Give My Regards to Black Jack" and "Tokko no Shima"! "Umizaru" his first serialization work as well as his representative work! =============== You can enjoy the 1st volume for free! The 2nd volume or later will be offered for a fee. =============== You can readily enjoy the huge hit record original version as movies and dramas in your iPhone / iPad. Please try it at this opportunity! =============== About "Umizaru": =============== It is the story depicting the activity of the Coast Guard officers mainly on sea disaster accidents with the main character, "Daisuke Senzaki," a Coast Guard officer. Some of the incidents and accidents described in the cartoon are the ones, which actually happened. Timely topics at that time, such as the spy ships (such as suspicious boats) incident, have also been incorporated into the story. It was serialized in "Weekly Young Sunday," a young cartoon magazine by Shogakukan from 1999 to 2001. The series has 12 volumes book (Shogakukan Young Sunday Comics). It was become a TV drama twice in NHK. Afterwards, it was picturized by Fuji TV from 2004 to 2012 by a flow: the movie 1 > the TV drama > the movie 2 > the movie 3 > the movie 4. ***************** The Title: Umizaru The Author: Shuho Sato The Site: Manga on Web (http://mangaonweb.con) *****************
Screenshots
Verdict
The clearest difference is price: Umizaru at Free against iBunkoHD's $6.99. Umizaru also leads on review sentiment (82% vs 58%). iBunkoHD's advantage is in-app purchases (none vs 10) and update cadence (every 2 months vs every 6 months). On ads and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Umizaru is free to download; iBunkoHD costs $6.99 up front. Umizaru sells 10 one-off in-app purchases. iBunkoHD asks for nothing beyond the download.
iBunkoHD ships an update every 2 months, Umizaru every 6 months. The most recent releases landed on September 27, 2026 and September 23, 2026 respectively.
| Parameter | iBunkoHD | Umizaru |
|---|---|---|
| Price | $6.99 | Free — better |
| Rating | 4.0 (7 ratings) — better | — |
| Positive reviews | 58.5% of reviews | 82.4% of reviews — better |
| Number of ratings | 7 — better | — |
| Update frequency | Every 2 months — better | Every 6 months |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Free with in-app purchases — better |
| Devices | iPad | iPhone, iPad — better |
| Requires iOS | 12.0 — better | 16.6 |
| Further details — not scored | ||
| Size | 35 MB | 5 MB |
| Age rating | 4+ | 12+ |
| Developer | DWANGO Co., Ltd. | Susumu Hoshikawa |
Customer experience
iBunkoHD
Umizaru
In-app purchases
iBunkoHD
No in-app purchases
Umizaru
- 海猿 第02巻$1.99
- 海猿 第03巻$1.99
- 海猿 第04巻$1.99
Show 7 moreShow fewer
- 海猿 第05巻$1.99
- 海猿 第06巻$1.99
- 海猿 第07巻$1.99
- 海猿 第08巻$1.99
- 海猿 第09巻$1.99
- 海猿 第11巻$1.99
- 海猿 第12巻$1.99









