Comparison

Comic Shelf vs Viewer DUO

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Comic Shelf

Features
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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。

About

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.

Highlights
  • 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
Features
Read full description

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

Comic Shelf4 screens
Viewer DUO3 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

UpkeepUpdate frequency

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.

Scorecard2 real differences · 6 level
Comic Shelf versus Viewer DUO: the parameters behind the verdict, then further details
ParameterComic ShelfViewer DUO
PriceFree — better$2.99
Positive reviews—0.0% of reviews
Update frequencyEvery 2 weeks — betterEvery 6 weeks
AdsNoNo
In-app purchasesNoNo
Monetization—Paid
DevicesiPhone, iPadiPhone, iPad
Requires iOS18.017.0 — better
Further details — not scored
Size8 MB2 MB
Age rating4+4+
DeveloperRYUZABU SAITOsatoshi amasaki

In-app purchases

None

Comic Shelf

No in-app purchases

None

Viewer DUO

No in-app purchases

Questions

Is Comic Shelf free?
Comic Shelf is free to download, with no in-app purchases.
Is Viewer DUO free?
Viewer DUO costs $2.99, with no in-app purchases.
Do Comic Shelf or Viewer DUO have ads?
Neither Comic Shelf nor Viewer DUO shows ads.
Which is updated more often, Comic Shelf or Viewer DUO?
Comic Shelf ships an update every 2 weeks, and Viewer DUO every 6 weeks. Most recently, Comic Shelf was updated on October 31, 2026 and Viewer DUO on November 6, 2026.

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