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.