OnePreview vs OpenFile

Open Markdown and developer files in OnePreview on iPhone and iPad. OnePreview renders GitHub-style Markdown, MDX, TextBundle and TextPack packages, JSON, JSONL, YAML, XML, CSV, TSV, TOML, ENV, SQLite databases, source code, plain text, logs, and ZIP and TAR.GZ archives. In Files, long-press a supported document, choose Open With, then select OnePreview. A normal tap may use Apple's built-in preview for common file types. Inside OnePreview, switch between rendered Markdown and source, view Mermaid diagrams and KaTeX math with bundled assets, inspect structured data and SQLite schemas, and check archive contents before extracting. Built for developer workflows, AI-generated files, documentation review, and everyday file browsing. Processing is fast, local-first, and does not require an account. Open a standard Markdown file (.md or .markdown) in the OnePreview app to export an A4 PDF report. Preview continued table headers, wrapped code, Mermaid diagrams and KaTeX formulas, then save the PDF using the system file interface. Document content is processed locally.

Open, preview, and explore over 100 file formats — right on your iPhone or iPad. No uploads, no account, no setup. Just tap a file and see it instantly. RICH FORMAT PREVIEWS Every format gets a purpose-built viewer: • 3D Models — Rotate and zoom glTF, OBJ, STL, PLY, and more in an interactive viewer • Code — Syntax highlighting for Swift, Python, JavaScript, TypeScript, Rust, Go, and 20+ languages • Databases — Browse SQLite tables, run SQL queries, and explore schema • Documents — Read PDFs, EPUB books, Word, Excel, and PowerPoint files • Archives — Explore ZIP, RAR, 7-Zip, TAR, and ISO contents without extracting • Audio & Video — Play MP3, WAV, FLAC, MP4, MOV, MKV, and more • Data Formats — View JSON, YAML, XML, CSV, Parquet, and Jupyter notebooks • Geospatial — Visualize GeoJSON, GPX, and KML on interactive maps • Fonts — Preview OpenType and TrueType font files • Images — View JPEG, PNG, GIF, HEIC, WebP, PSD, and SVG BUILT-IN DEVELOPER TOOLS Go beyond viewing with 10 built-in tools: • Hex Inspector — View raw file bytes • Compare Files — Side-by-side diff • Checksum — Calculate MD5, SHA-1, and SHA-256 hashes • Extract Text — Pull text from any document • Export as PDF — Convert any preview to PDF • Base64 — Encode and decode • Pretty Print — Format JSON, XML, HTML, and CSS • Text Statistics — Word count, line count, reading time • File Identification — Detect the true file type from magic bytes PRIVACY FIRST All processing happens on your device. Files are never uploaded. No account is needed. No tracking. WORKS WITH YOUR WORKFLOW • Open files directly from the Files app or Share Sheet • Browse iCloud Drive • Track recently opened files and pin your favorites • Search your file history Works on iPhone and iPad. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/