# N4 読解問題集 vs Bookoscope

The clearest difference is price: Bookoscope at $2.99 against N4 読解問題集's $9.99. Bookoscope also leads on update cadence (every 5 days vs every 21 months) and iOS requirement (13.0 vs 17.2). On ads, in-app purchases and device support there is nothing between them.

N4 読解問題集 costs $9.99 and Bookoscope $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

N4 読解問題集 ships an update every 21 months, Bookoscope every 5 days. The most recent releases landed on October 7, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | N4 読解問題集 | Bookoscope |
| --- | --- | --- |
| Price | $9.99 | **$2.99** |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/bookoscope-opds-crawler/id6476512234/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 21 months | **Every 5 days** |
| Monetization | — | Paid |
| Size | 2 MB | 35 MB |
| Requires iOS | 17.2 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 12+ |
| Developer | [Yamase & Touwa Japanese Insititute](https://appshunter.io/developer/442115304) | [Isaac Lyman](https://appshunter.io/developer/1644594506) |

## What reviewers say

### N4 読解問題集

[App page](https://appshunter.io/ios/app/n4/id654088367)

**Features:** Vision Pro support

**In-app purchases:** none


### Bookoscope

[App page](https://appshunter.io/ios/app/bookoscope-opds-crawler/id6476512234)

Browse and download public domain ebooks or access your own self-hosted library. This app crawls OPDS endpoints, caches book data, and allows quick export to your preferred ereader.

**Highlights:** Browse self-hosted ebook libraries, Download public domain classics, Searchable by metadata, Cached feeds, Quick download and export, Compatible with Calibre-web, Kavita, Ubooquity

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

**In-app purchases:** none


## Frequently asked questions

### Is N4 読解問題集 free?

N4 読解問題集 costs $9.99, with no in-app purchases.

### Is Bookoscope free?

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

### Do N4 読解問題集 or Bookoscope have ads?

Neither N4 読解問題集 nor Bookoscope shows ads.

### Which is updated more often, N4 読解問題集 or Bookoscope?

N4 読解問題集 ships an update every 21 months, and Bookoscope every 5 days. Most recently, N4 読解問題集 was updated on October 7, 2026 and Bookoscope on October 16, 2026.

---

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