- Gives documents more room on iPhone Duo's outer display: the preview mode note fits on one line (tap it for the full explanation), and search keeps the result count and controls beside the field when there is space. - Open File, Open ZIP Package, and Paste to Preview now share one row in the library. On the outer display, Settings and Edit can move to the side toolbar, and the library title is no longer cut off on the inner display. - On larger displays, JSON and YAML show each field's key, value, and type on one line, and the Table of Contents can stay beside the document. - When iPhone Duo is partially open, the library stays on one side of the fold, and a selected search result moves clear of the fold. - On iOS 27.1, Find in Document is available directly from the toolbar. - Files continue to be processed and stored locally on your device.

- Adapts the library, reader, and native controls to iPhone Duo's inner and outer displays. - Keeps reading position when the reader resizes and helps visible search results stay in view. HTML and Markdown search can continue across folding transitions. - Makes JSON and YAML search results easier to read with the keyboard open in compact layouts. - Improves original-file and PDF sharing through rotation and folding, and keeps Paste Preview and Settings navigation controls available while scrolling. - Files continue to be processed and stored locally on your device.

- Added read-only JSON previews: expand objects and arrays, search fields, and view highlighted source with line numbers. - Copy JSON values and field paths without rounding large numeric IDs, and locate syntax errors by line and column. - Import multiple documents or ZIP packages in one selection. Update duplicates, keep both copies, or skip individual files. - Review imported, skipped, and failed totals with failure details; one failed file does not stop the batch. - Added a JSON sample, JSON library filter, and JSON support in Paste Preview. Files continue to be processed on device.

- Open .yaml and .yml files directly, or paste YAML text for an offline preview. - Browse nested objects and arrays, search fields and values, and copy values or field paths. - Read syntax-highlighted source with line numbers and jump from a field to its source. - Switch between multiple YAML documents and locate syntax errors by line and column. - Includes an app configuration sample and remembers your YAML reading position.

- Code blocks now support syntax highlighting and exact one-tap copying. - Render LaTeX-style math and Mermaid diagrams in Markdown, entirely offline. - Search equations and diagrams, and include them in PDF exports. - Browse HTML and Markdown pages within ZIP packages using a searchable page list and back navigation. - ZIP packages remember the last page and each page’s reading position.

- Full-screen reading gives your documents more room. - Adjust HTML zoom and Markdown text size and line spacing. Your display settings are remembered. - Open local Markdown images in a full-screen viewer with pinch-to-zoom. - Find files by name and filter your library by HTML, Markdown, or ZIP. - Pin frequently used files and change their display names without renaming the original files. - When importing a duplicate, choose to update the existing file, keep both copies, or cancel.

- Find text in HTML and Markdown, jump between matches, and navigate with a heading outline. - Pick up where you left off with saved reading positions. - Paste HTML or Markdown text to create a preview and keep it in Recent Files. - Explore the animated HTML sample with day/evening scenes and a pause control. - New HTML files now open in Interactive mode. Safe Preview remains available, and saved mode choices are preserved. - Reading tools, preview mode, sharing, and file details now sit at the bottom right, leaving more room for document titles.

- Fixed ZIP sharing so packages include their stylesheets and images. - Export HTML and Markdown previews as PDFs. - Read Markdown tables with aligned columns and horizontal scrolling for wider tables. - Get to recent files first, with a collapsible samples section below. - Explore three redesigned samples: Weekend plan, Reading notes, and Reading week, with light and dark appearances that match the app. - Fixed missing headings and list items in some Markdown documents.

Richer built-in HTML and ZIP samples now showcase responsive layouts, inline graphics, local assets, and CSS animation. App Store screenshots have also been refreshed.