OnePreview

Markdown Quick Look plus developer files: preview MDX, TextBundle, TextPack, Mermaid, KaTeX, JSONL, code, SQLite, folders and ZIP.

OnePreview turns Apple Quick Look into a Markdown preview and developer-file viewer for iPhone, iPad, and Mac. Preview GitHub-style Markdown, MDX, TextBundle and TextPack packages, JSON, JSONL, YAML, XML, CSV, TSV, TOML, ENV, SQLite databases, source code, plain text, logs, folders, and ZIP archives.

Open files directly from Files or Finder and understand their contents without launching a full editor. Switch Markdown between rendered view and source, render Mermaid diagrams and KaTeX math with bundled assets, read structured data in a clean layout, inspect tables, logs, configuration files, and SQLite schemas, browse folders, and preview archive contents before extracting.

Built for developer workflows, AI-generated files, documentation review, and everyday file browsing: fast, local-first, and integrated into the system preview flow.