# 読書尚友 vs Mathema Ebook Reader

The clearest difference is rating: 読書尚友 at 4.0 against Mathema Ebook Reader's 2.0. Mathema Ebook Reader's advantage is in-app purchases (none vs 1) and ads (none vs shown). On price, ratings volume, update cadence and device support there is nothing between them.

Both are free to download. 読書尚友 sells 1 one-off in-app purchase. Mathema Ebook Reader asks for nothing beyond the download.

読書尚友 holds the better App Store score, 4.0 against 2.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

読書尚友 ships an update every 2 weeks, Mathema Ebook Reader every 3 weeks. The most recent releases landed on October 8, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | 読書尚友 | Mathema Ebook Reader |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (1 ratings)](https://appshunter.io/ios/app/id1579254502/reviews)** | [2.0 (1 ratings)](https://appshunter.io/ios/app/mathema-ebook-reader/id6463588021/reviews) |
| Number of ratings | 1 | 1 |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 2 weeks** | Every 3 weeks |
| Monetization | Free with in-app purchases | **Free** |
| Size | 45 MB | 29 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [hishida](https://appshunter.io/developer/314082596) | [MASEMA, K.K.](https://appshunter.io/developer/1704601664) |

## What reviewers say

### 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 |


### Mathema Ebook Reader

[App page](https://appshunter.io/ios/app/mathema-ebook-reader/id6463588021)

Learn high school and university math and physics with interactive ebooks and video explanations. This app is designed for students seeking supplementary educational resources.

**Highlights:** High school math learning, University math learning, University physics learning, Ebook format, Video explanations

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 読書尚友 free?

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

### Is Mathema Ebook Reader free?

Mathema Ebook Reader is free to download, with no in-app purchases.

### Which has better reviews, 読書尚友 or Mathema Ebook Reader?

読書尚友 is rated higher. 読書尚友 averages 4.0 out of 5 from 1 ratings, while Mathema Ebook Reader averages 2.0 from 1 ratings.

### Do 読書尚友 or Mathema Ebook Reader have ads?

読書尚友 shows ads; Mathema Ebook Reader does not.

### Which is updated more often, 読書尚友 or Mathema Ebook Reader?

読書尚友 ships an update every 2 weeks, and Mathema Ebook Reader every 3 weeks. Most recently, 読書尚友 was updated on October 8, 2026 and Mathema Ebook Reader on October 1, 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.*