A native macOS markdown viewer with live transclusion, rich rendering, instant reload, and export that keeps up with serious documents.
Ohai now covers source-aware docs, AI progress files, scientific Markdown, Finder previews, and shareable exports from one local renderer.
Start with the job you need done
Ohai is strongest when each file is a live surface: a progress monitor, a living source doc, a scientific notebook, or a shareable report.
Watch an AI work
Open the progress file and follow task lists, tables, code, and generated images as they appear.
Keep docs tied to source
Reference files, headings, functions, classes, and data paths without copying code into stale examples.
Review chemistry and biology
Render SMILES, SAR tables, sequence maps, 3D structures, assay charts, and ELN-style attachments.
Ship the result
Export the composed document to HTML, PDF, DOCX, or processed Markdown for collaborators.
Workflows
Living API Documentation
Transclude your source files into a README. When the code changes, the docs update automatically. Documentation that can never go stale.
Learn moreMonorepo Dashboard
One master document that pulls status from multiple packages. Update any changelog, the dashboard updates. Perfect for tech leads.
Learn moreAI Pair Programming
Open a progress file in Ohai while Claude works. Watch task lists check off, tables populate, and code blocks appear—all in real-time.
Learn moreMedChem & Biology Notes
Render SMILES, reaction SMILES, SAR tables, SeqViz maps, phylogenetic trees, 3Dmol.js structures, assay charts, and local ELN-style attachments.
Learn moreCore Features
The capabilities that set Ohai apart.
Live Transclusion
Embed files, sections, code symbols, and data paths with ![[file.md]] syntax. Nested markdown recurses up to 3 levels deep with circular reference protection.
Learn moreCode-Aware Embedding
Transcluded source files get syntax highlighting for 185+ languages and symbol extraction across 40+ code and data formats.
Chemistry & Biology Rendering
Text fences and inline syntax become molecules, reactions, SAR tables, sequence maps, phylogenetic trees, chromosomes, charts, and 3D molecular views.
Learn moreInstant Reload
See changes the moment you (or your coding agent!) save. Hybrid file monitoring works with any editor—even Vim's atomic saves.
Learn moreLive Images
Embed local or remote images. Local images live-reload when updated—perfect for graphs, charts, and dashboards generated by your scripts.
Section Navigation
Jump to any heading, even in composite documents. Source mapping tracks content across transcluded files.
Large Document Performance
Smooth scrolling in 500KB+ files. Automatic virtualization renders only what's visible—no lag, no stutter.
Learn morePolish
Small details that make a big difference.
Callouts & Collapsible Sections
Obsidian-style callouts and collapsible headings keep long documents scannable.
Learn moreCopy Code Button
Hover any code block for one-click copy with confirmation.
Composer & Samples
Draft Markdown with a source pane, live preview, save flow, bundled sample browser, and prompt builder for AI handoff.
Learn moreQuick Look for Markdown
Press Space on any .md file in Finder to preview it with rendered formatting, syntax highlighting, wiki-links, images, and clean thumbnails.
Learn more20 Languages
Available across 20 locale bundles, with new feature copy kept ready for translation updates.
Integration
Works with your existing tools and workflows.
Export
Export to standalone HTML, PDF, DOCX, or processed Markdown with source links, images, syntax highlighting, and rendered visual content.
Learn moreAI Integration
Watch Claude Code or any AI assistant write in real-time. Task lists check off as work completes.
Learn moreAppleScript
Automate Ohai with AppleScript. Control sidebar, theme, zoom, and scroll to headings programmatically.
Learn moreHow Ohai Compares
Feature comparison with other markdown tools.
| Feature | Ohai | Obsidian | Marked 2 | GitHub |
|---|---|---|---|---|
| Live reload | Instant (hybrid) | Instant | Polling | — |
| Atomic save support | ✓ | ✓ | ✗ | — |
| Transclusion | 40+ code/data formats | Markdown only | ✗ | ✗ |
| Code highlighting in transclusion | ✓ | ✗ | — | — |
| Math, diagrams, and scientific blocks | ✓ | Plugins | Partial | Partial |
| Large doc performance | Virtualized | Good | Poor | — |
| Native macOS | ✓ | Electron | ✓ | Web |