Studio Graphē One
For the longest books.
A dedicated reader for the large book format. Built for massive academic works, reference volumes, and the longest texts in your library — where other readers stall, Codex stays smooth. For iPhone, iPad, and Mac.
iOS 17, iPadOS 17, and macOS 14 or later
Scroll to exploreFeatures
Everything you need, working together seamlessly
Codex is a dedicated reader for the large book format — fast when the work is enormous, precise when the text is dense, and quiet enough to disappear when you just want to read.
Massive Documents
Fast, fluid handling of thousand-page PDFs and multi-volume works. Where other readers stall, Codex keeps pace.
EPUB & PDF
First-class support for both formats, with the same powerful navigation and search tools across them.
Nested & Collapsible TOC
Deeply nested tables of contents that collapse and expand at every level. Navigate vast structured works without ever losing your place.
Full-Text Search
Near-instant search across entire volumes, with ranked results and live previews of each match in context.
Annotations
Highlight, underline, and annotate passages. Your marks stay with you across iPhone, iPad, and Mac.
Beautiful Typography
Carefully chosen fonts, adjustable size, line height, margins, and day-and-night themes. Read your way.
Cross-References
Tap any reference to see its target in a popover, or jump to it in a single step. Built for richly cross-referenced texts and critical editions.
Lexicon Popovers
Tap any word to open a dictionary, lexicon, or glossary entry inline. Explore original-language roots without ever leaving the page.
"Habent sua fata libelli."
Books have their own destinies — Terentianus Maurus, De litteris
Capability
Any format. Any size.
Drop in a five-thousand-page PDF, a critical edition laden with footnotes, or an EPUB with a deeply nested table of contents — Codex opens it, indexes it, and lets you read.