
About
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.
What's New in Viewer DUO
1.1
October 27, 2026
- New "Slide two at a time" mode: numbered images sit side by side and one swipe changes both - Import a folder of images, or several images at once, as one book - Fixed-layout EPUB comics now display correctly, with their covers - Pinch a page to zoom - Fixed freezes and failures when importing large files or files stored in iCloud - Fills the whole screen on iPhone Duo, and the fold of an open Duo becomes the spine of the book - Illustrations now appear in vertical text, each on its own page
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FAQ
What file formats does Viewer DUO support?
Viewer DUO supports a wide range of formats including PDF, EPUB, TXT, ZIP (for CBZ), and RAR (for CBR). This allows you to read various types of books and comics.
Does Viewer DUO have ads?
No, Viewer DUO is ad-free. The description explicitly states 'No ads', ensuring an uninterrupted reading experience.
Can I use Viewer DUO offline?
Yes, Viewer DUO works offline. You do not need an internet connection to read your books and comics, making it convenient for travel or areas with poor connectivity.
What devices is Viewer DUO available on?
Viewer DUO is available on iPhone and iPad. Its features adapt to screen size, offering two-page spreads on larger devices.
How does Viewer DUO handle text customization?
Viewer DUO offers extensive text customization, including serif, sans, rounded, Mincho, and Gothic fonts. You can also adjust size, leading, margins, and enable vertical Japanese writing.
What is the price of Viewer DUO?
Viewer DUO is a one-time purchase priced at $2.99. There are no subscriptions or in-app purchases required after the initial buy.
How often is Viewer DUO updated?
The latest version is 1.1, last updated on October 27, 2026. This indicates a recent update, suggesting ongoing support and potential for future improvements.
Does Viewer DUO include any books?
No, Viewer DUO is a viewer for your own book files. No books are included with the purchase of the app.


