Comic Shelf vs Viewer DUO
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Comic Shelf
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Comic Shelfは、自分でスキャンした本(自炊データ)を読むための、 iPhone/iPad向けのシンプルなコミックビューアーです。 【対応形式】 ZIP・CBZ・RAR・CBR・PDF・画像を直接含むフォルダに対応しています。 【読みやすさへのこだわり】 ・右開き(縦書きマンガ)/左開きを切り替え可能 ・見開き表示(横長ページは自動で単独表示、表紙合わせにも対応) ・ページめくりはスライド/紙めくり(カール)から選択 ・縦スクロール表示(連続読み)にもワンタップで切替 ・タップゾーン/スワイプでのページ送り、ピンチ・ダブルタップでの拡大 ・サムネイル一覧やスライダから好きなページへすぐ移動 ・しおり、ヒストリバック、読書位置を自動で記憶 【本棚】 ・読書中の本をカルーセルでまとめて表示、タップで即再開 ・本棚を複数作成して整理 ・シリーズ(巻まとめ)をドラッグ&ドロップや複数選択で作成 ・本棚の見た目を6種類のテーマから選択(ホワイト/クリーム/木目/本棚/和紙/レンガ) 【本の取り込み方】 ・アプリ内の「+」からファイルを選択(複数選択・フォルダ単位もOK) ・MacのFinderやWindowsのファイル管理でこの端末の「Comic Shelf」フォルダへ直接コピー ・自宅のNAS・PCから、Windows共有(SMB)またはFTPで直接取り込み ・ファイル名がShift-JISのZIP/NASにも対応 【データについて】 取り込んだ本・しおり・読書位置は、すべて端末内に保存されます。 外部のサーバーへの送信や、利用状況の収集は一切行っていません。 自分の蔵書を、自分の端末の中で、気持ちよく読むためのアプリです。
Viewer DUO
Experience the tactile sensation of turning physical pages on your screen. This app simulates realistic page curls, shadows, and natural settling speeds for an immersive reading experience. It supports various formats and offers extensive customization for text and paper appearance.
- Realistic page-curl simulation
- Two-page spread for landscape view
- Supports PDF, EPUB, TXT, CBZ, CBR
- Customizable text fonts and styles
- Multiple paper and desk textures
- Table of contents, bookmarks, search
- Offline functionality
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The feel of turning real paper, on your screen. Viewer DUO simulates every page as a physical sheet. Pull an edge and the paper lifts, the back shows through faintly, and a shadow falls on the page beneath. Let go and it settles at a natural speed. On iPad and landscape iPhone the book opens as a two-page spread, just like print. On iPhone Duo the hinge becomes the spine. • Formats — PDF / EPUB / TXT / ZIP・CBZ / RAR・CBR • Turning — drag to follow your finger, tap an edge to turn, pinch a corner for a diagonal curl • Spread / single page — automatic. Right-to-left for manga and vertical text • Text books — serif, sans, rounded, Mincho and Gothic; size, leading, margins; vertical Japanese writing • Six papers × six desks — white, cream, parchment, sepia, moss, night / walnut, marble, indigo linen, leather, obsidian, ivory • Table of contents, bookmarks, full-text search, double-tap to zoom • Warm filter, page-thickness stack, keep-awake while reading • Remembers where you stopped. Continue reading with one tap • No ads, no account, works offline One-time purchase. This app is a viewer for your own book files. No books are included.
Screenshots
Verdict
The clearest difference is price: Comic Shelf at Free against Viewer DUO's $2.99. Comic Shelf also leads on update cadence (every 2 weeks vs every 6 weeks). On ads, in-app purchases, device support and iOS requirement 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
Comic Shelf is free to download; Viewer DUO costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Comic Shelf ships an update every 2 weeks, Viewer DUO every 6 weeks. The most recent releases landed on October 31, 2026 and November 6, 2026 respectively.
| Parameter | Comic Shelf | Viewer DUO |
|---|---|---|
| Price | Free — better | $2.99 |
| Positive reviews | — | 0.0% of reviews |
| Update frequency | Every 2 weeks — better | Every 6 weeks |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Paid |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 18.0 | 17.0 — better |
| Further details — not scored | ||
| Size | 8 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | RYUZABU SAITO | satoshi amasaki |
In-app purchases
Comic Shelf
No in-app purchases
Viewer DUO
No in-app purchases





