Viewer DUO
37 days old
Viewer DUO is #12 in Books Paid in Japan and charting in 3 of 30 countries we track.
Updated 24 Oct 2026 · rankings refresh through the day
Developersatoshi amasaki
CategoryBooks
Price3.99 CAD
Released
Rating★ 0.0 (0)
Version1.0
Age rating4+
First seen by us
2 Oct 2026
2 Oct 2026Rating
0.0 ★
0 ratings
Measured
Best rank now
#12
Books PaidMeasured
Viewer DUO on the App Store
App details
App ID
6811308523
Publisher
satoshi amasaki
On the store since
Sep 2026
Under a year
Minimum OS
iOS 17.0+
iPhone XS and later
Devices
iPhone · iPad
Universal purchase
Content rating
4+
Languages
2
EN JA
Size
2 MB
Also listed in
Books, Utilities
Where Viewer DUO's downloads come from Modelled
Last 30 days: organic search, browsing the store, features and paid ads.
Where it ranks now
Every top chart it appears in across 30 countries.
| Country | Charts | Rank |
|---|---|---|
| Japan | BooksPaid | #12 |
 South Korea | BooksPaid | #7 |
 China | BooksPaid | #18 |
| South Korea | All AppsPaid | #174 |
Apps near Viewer DUO on the chart
Books Paid, around #12.
Ratings
App Store, worldwide.
Rating
0.0 ★
0 ratings
Measured
Ratings
0
Measured
What users say about Viewer DUO
From recent reviews.
About 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.
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.
Latest updates
1.0
