# Viewer DUO — Page-curl book & comic reader

> Page-curl book & comic reader (iPhone/iPad app by satoshi amasaki.)

- Source: https://appshunter.io/ios/app/viewer-duo/id6811308523 (this page in markdown: same URL + `.md`)
- Developer: [satoshi amasaki](https://appshunter.io/developer/1891268722)
- Category: Books, Utilities
- Price: $2.99
- Age rating: 4+
- Requires: iOS 17.0 · 2 MB
- Languages: American English, Japanese
- Released: 2026-09-17
- Data updated: 2026-10-01
- User reviews in markdown: https://appshunter.io/ios/app/viewer-duo/id6811308523/reviews.md

## What is Viewer DUO?

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.


## Version history (last 1 release)

### 1.0 — 2026-09-17

No release notes.

## More apps by satoshi amasaki

- [CompactCam](https://appshunter.io/ios/app/compactcam/id6761750166)
- [ノミワスレーヌ](https://appshunter.io/ios/app/id6761757464)
- [Real Soroban](https://appshunter.io/ios/app/real-soroban/id6761827077)
- [ズツウォッチ](https://appshunter.io/ios/app/id6761879273)
- [FourScan - Spy Detector](https://appshunter.io/ios/app/fourscan-spy-detector/id6761895107)
- [Enochian Keys](https://appshunter.io/ios/app/enochian-keys/id6762251166)

All apps by satoshi amasaki: https://appshunter.io/developer/1891268722

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-01.*