読書尚友 vs Mathema Ebook Reader
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
読書尚友
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.
- 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
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読書尚友」はiOS 用の日本語縦書きファイルビューアです。青空文庫で公開されている一万冊以上の作品を快適に読書できます。ローカルファイルのビューアとしても利用できます。 ・テキスト、html、PDF、OOXML(.docx)、ODF(.odt)、ePub、htmlz、画像(jpeg, png,bmp)、zip(書庫内のテキストファイルを表示)に対応 ・文字コード自動判定(Shift_JIS,UTF-8,UTF-16) ・作家別・作品別・分野別(NDC)、公開年別の作品リスト、新規公開作品、アクセスランキング ・書き出しの表示 ・青空文庫からのダウンロード ・本棚 ・マーカー ・ローカルファイルの表示 ・作品名の検索 ・青空文庫の主要な注記に対応 ・目次（青空文庫の見出し注記から作成） ・文書内の文字列検索 ・フォントサイズ、フォントの変更 ・背景色・背景画像 ・ページ方向（縦書き・横書き） ・行頭・行末禁則、自動縦中横
Mathema Ebook Reader
Learn high school and university math and physics with interactive ebooks and video explanations. This app is designed for students seeking supplementary educational resources.
- High school math learning
- University math learning
- University physics learning
- Ebook format
- Video explanations
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スマートフォン、タブレットを使用した高校数学、大学数学・物理学を電子書籍と解説付き動画で学習できます。
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | 読書尚友 | Mathema Ebook Reader |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (1 ratings) — better | 2.0 (1 ratings) |
| Positive reviews | 50.0% of reviews | — |
| Number of ratings | 1 | 1 |
| Update frequency | Every 2 weeks — better | Every 3 weeks |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 45 MB | 29 MB |
| Age rating | 4+ | 4+ |
| Developer | hishida | MASEMA, K.K. |
Customer experience
読書尚友
Mathema Ebook Reader
In-app purchases
読書尚友
- 広告削除$1.99
Mathema Ebook Reader
No in-app purchases
