i読書 vs 読書尚友
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
i読書
This app allows users to download and read books from the Aozora Bunko library on their iPhone or iPad. Browse by author or title to find and save literary works for offline reading.
- Download Aozora Bunko books
- Browse by author
- Browse by title
- Save books for offline reading
- Simple interface
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「i読書」はシンプルな青空文庫リーダーです。 作者名別、作品名別の一覧から青空文庫作品をダウンロードし、iPhone/iPadに保存して読むことができます。
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
Screenshots
Verdict
The clearest difference is rating: 読書尚友 at 4.0 against i読書's 3.0. 読書尚友 also leads on update cadence (every 2 weeks vs every 2 months). i読書's advantage is in-app purchases (none vs 1) and ads (none vs shown). On price, review sentiment 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. i読書 asks for nothing beyond the download.
読書尚友 holds the better App Store score, 4.0 against 3.0. Both are backed by a comparable volume of ratings — 3 and 1 respectively. Written reviews split almost evenly too, at 50% and 50% positive.
i読書 ships an update every 2 months, 読書尚友 every 2 weeks. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.
| Parameter | i読書 | 読書尚友 |
|---|---|---|
| Price | Free | Free |
| Rating | 3.0 (3 ratings) | 4.0 (1 ratings) — better |
| Positive reviews | 50.0% of reviews | 50.0% of reviews |
| Number of ratings | 3 — better | 1 |
| Update frequency | Every 2 months | Every 2 weeks — better |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 7.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 19 MB | 45 MB |
| Age rating | 4+ | 4+ |
| Developer | yaslab | hishida |
Customer experience
i読書
読書尚友
In-app purchases
i読書
No in-app purchases
読書尚友
- 広告削除$1.99
