# iBunkoS vs 帝国書院

The clearest difference is price: 帝国書院 at Free against iBunkoS's $2.99. iBunkoS's advantage is chart position (#182 vs unranked). On update cadence, ads, in-app purchases and device support there is nothing between them.

帝国書院 is free to download; iBunkoS costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

iBunkoS ships an update every 2 months, 帝国書院 every 6 weeks. The most recent releases landed on October 19, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | iBunkoS | 帝国書院 |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[4.4 (9 ratings)](https://appshunter.io/ios/app/ibunkos/id418102178/reviews)** | — |
| Number of ratings | **9** | — |
| Positive reviews | 51.2% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 6 weeks** |
| Monetization | Paid | — |
| Best chart rank | **#182** | — |
| Size | 34 MB | 44 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [DWANGO Co., Ltd.](https://appshunter.io/developer/297539595) | [帝国書院](https://appshunter.io/developer/539448058) |

## What reviewers say

### iBunkoS

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

**Currently charting:** #182 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


### 帝国書院

[App page](https://appshunter.io/ios/app/id6745578086)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is iBunkoS free?

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

### Is 帝国書院 free?

帝国書院 is free to download, with no in-app purchases.

### Do iBunkoS or 帝国書院 have ads?

Neither iBunkoS nor 帝国書院 shows ads.

### Which is updated more often, iBunkoS or 帝国書院?

iBunkoS ships an update every 2 months, and 帝国書院 every 6 weeks. Most recently, iBunkoS was updated on October 19, 2026 and 帝国書院 on October 8, 2026.

---

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