N4 読解問題集 vs Bookoscope
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
N4 読解問題集
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New JLPT N4 Reading Problems, Compliant with the latest JLPT questions, and is accompanied by explanations in Chinese, making it easy to learn the Japanese language. They can be divided into six categories: 1. short articles, 2. correspondence, 3. long articles. There are 16 articles and 37 questions to help you develop your Japanese language skills.
Bookoscope
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.
- Browse self-hosted ebook libraries
- Download public domain classics
- Searchable by metadata
- Cached feeds
- Quick download and export
- Compatible with Calibre-web, Kavita, Ubooquity
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Bookoscope is a fast, searchable ebook catalog. With Bookoscope, you can browse your own self-hosted ebook library as well as download public domain classics from Project Gutenberg. FEATURES: - Fast - Easy on the eyes - Includes over 70,000 public domain books from Project Gutenberg - Uses cached feeds (refresh on demand) - Searchable by any available metadata - Quick download and export to the ereader of your choice COMPATIBLE WITH: - Calibre-web - Kavita - Ubooquity - Any ebook server with OPDS 1.0 functionality WHY USE BOOKOSCOPE? Some ereader apps can connect to OPDS endpoints, but the functionality is tucked away and awkward. There's no way to browse and search all the ebooks you have access to, all at once. Bookoscope fills that niche. It crawls your OPDS endpoints, finds and caches all the books it can, and lets you easily download any of them to your device. From there, you can export them to your preferred ereader. BOOKOSCOPE IS NOT: - An ebook reader, sync client, or annotator, like Apple Books, Google Books, or Kindle. - A metadata editor or organizer, like Calibre. - A self-hosted ebook server, like Kavita, Ubooquity, or calibre-web. Bookoscope may be used with any of the above, but is not affiliated with any other app or tool. WHAT IS OPDS? OPDS is the open standard for web endpoints that expose catalogs of ebooks. Many people use home OPDS servers for their personal ebook libraries. WHAT IF I DON'T HAVE AN OPDS SERVER? That's okay! You can use Bookoscope to browse and download free, completely legal books in the public domain. Start with classics like: - Moby Dick - Frankenstein - Pride and Prejudice - The Great Gatsby - The complete works of William Shakespeare, Charles Dickens, Frederick Douglass, and more!
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | N4 読解問題集 | Bookoscope |
|---|---|---|
| Price | $9.99 | $2.99 — better |
| Rating | — | 5.0 (1 ratings) — better |
| Positive reviews | — | 0.0% of reviews |
| Number of ratings | — | 1 — better |
| Update frequency | Every 21 months | Every 5 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Paid |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.2 | 13.0 — better |
| Further details — not scored | ||
| Size | 2 MB | 35 MB |
| Age rating | 4+ | 12+ |
| Developer | Yamase & Touwa Japanese Insititute | Isaac Lyman |
In-app purchases
N4 読解問題集
No in-app purchases
Bookoscope
No in-app purchases
