# iBunkoS vs 読書尚友

The clearest difference is price: 読書尚友 at Free against iBunkoS's $2.99. 読書尚友 also leads on update cadence (every 2 weeks vs every 2 months). iBunkoS's advantage is in-app purchases (none vs 1) and ads (none vs shown). On device support there is nothing between them.

読書尚友 is free to download; iBunkoS costs $2.99 up front. 読書尚友 sells 1 one-off in-app purchase. iBunkoS asks for nothing beyond the download.

iBunkoS holds the better App Store score, 4.4 against 4.0. That said, the two scores are not equally well evidenced: iBunkoS has 9 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 58% of iBunkoS's written reviews are positive against 50% of 読書尚友's.

iBunkoS ships an update every 2 months, 読書尚友 every 2 weeks. The most recent releases landed on September 22, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | iBunkoS | 読書尚友 |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[4.4 (9 ratings)](https://appshunter.io/ios/app/ibunkos/id418102178/reviews)** | [4.0 (1 ratings)](https://appshunter.io/ios/app/id1579254502/reviews) |
| Number of ratings | **9** | 1 |
| Positive reviews | **58.3% of reviews** | 50.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Monetization | Paid | **Free with in-app purchases** |
| Best chart rank | **#166** | — |
| Size | 34 MB | 45 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [DWANGO Co., Ltd.](https://appshunter.io/developer/297539595) | [hishida](https://appshunter.io/developer/314082596) |

## What reviewers say

### iBunkoS

[App page](https://appshunter.io/ios/app/ibunkos/id418102178)

**Currently charting:** #166 Top Paid · Book (US App Store)

This app offers a realistic paper book reading experience on your iPhone, supporting various file formats like TXT, PDF, and comics. It includes features like a digital bookshelf, bookmarking with notes, and dictionary lookups.

**Highlights:** 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

**Features:** Vision Pro support

**In-app purchases:** none


### 読書尚友

[App page](https://appshunter.io/ios/app/id1579254502)

This app is a Japanese vertical text viewer for iOS, offering access to over 10,000 works from Aozora Bunko and supporting local files. It handles various formats and provides customization options for a comfortable reading experience.

**Highlights:** Supports various file formats (text, HTML, PDF, ePub, images, etc.), Automatic character code detection, Browse Aozora Bunko by author, title, genre, and ranking, Download books directly from Aozora Bunko, Customizable font, size, background, and page direction, In-app search and bookmarking

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 広告削除 | $1.99 | one-time |


## Frequently asked questions

### Is iBunkoS free?

iBunkoS costs $2.99, with no in-app purchases.

### Is 読書尚友 free?

読書尚友 is free to download, with in-app purchases available.

### Which has better reviews, iBunkoS or 読書尚友?

iBunkoS is rated higher. iBunkoS averages 4.4 out of 5 from 9 ratings, while 読書尚友 averages 4.0 from 1 ratings.

### Do iBunkoS or 読書尚友 have ads?

読書尚友 shows ads; iBunkoS does not.

### Which is updated more often, iBunkoS or 読書尚友?

iBunkoS ships an update every 2 months, and 読書尚友 every 2 weeks. Most recently, iBunkoS was updated on September 22, 2026 and 読書尚友 on September 21, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*