OpenMark Is Now on the Mac App Store
OpenMark, a native macOS markdown editor with Mermaid diagrams, LaTeX math, and Liquid Glass design, is officially available on the Mac App Store for $9.99.
OpenMark is officially on the Mac App Store.
It's a native macOS markdown editor — built with SwiftUI, designed for macOS Tahoe, and priced at $9.99 as a one-time purchase. No subscription, no account, no tracking.
What OpenMark Does
OpenMark opens .md files and renders them. That's the pitch. You double-click a markdown file, and instead of raw syntax in a code editor, you see a beautifully formatted document with rendered headings, code blocks, tables, and links.
But it goes further than basic rendering:
Mermaid diagrams render inline. Flowcharts, sequence diagrams, Gantt charts, mind maps — if it's valid Mermaid syntax in a fenced code block, OpenMark draws it. No plugins, no configuration. The Mermaid.js library is bundled directly in the app.
LaTeX math renders inline via bundled KaTeX. Write $E = mc^2$ and see it typeset. Write display-mode equations with $$...$$ and they render centered. If you're a student or researcher working with math in markdown, this saves the round-trip to a separate renderer.
Syntax highlighting covers 30+ languages. Code blocks get proper colour treatment so you can actually read them.
Two view modes — Document view shows the rendered output. Markdown view shows the raw source with syntax highlighting. Toggle between them with ⌘⇧M. No split pane, no wasted screen space.
Export to PDF and HTML when you need to share your work with someone who doesn't have a markdown editor. The export preserves your rendered Mermaid diagrams and LaTeX math, so the output looks exactly like what you see in the app. More on export workflows in our exporting guide.
Why Native Matters
OpenMark is a SwiftUI app. Not Electron, not a web wrapper — a native macOS binary that launches in under a second, uses about 60 MB of memory, and weighs 9 MB on disk.
That means it integrates with macOS the way you'd expect. Spotlight indexes your markdown files through OpenMark's bundled Spotlight Importer, so you can search the contents of your .md files from anywhere. Quick Look previews work. Drag and drop works. The app respects your system appearance, supports Stage Manager, and works with macOS Tahoe's Liquid Glass design language — the toolbar floats with the translucent material that adapts to what's behind the window.
If you care about native Mac apps over Electron alternatives, OpenMark was built with the same philosophy.
Who It's For
OpenMark fills a specific gap. It's not a knowledge management system like Obsidian. It's not a code editor like VS Code. It's not a writing app with a proprietary format like Ulysses.
It's a markdown editor. It opens your files wherever they live — in git repos, iCloud Drive, project folders, on your Desktop — and shows them to you rendered. You edit them when you need to. You export them when you need to. That's it.
The people who tend to need this are developers who work with README.md and documentation files, students writing notes and papers with math notation, technical writers producing docs in markdown, and anyone who's adopted a plain text workflow and wants a better way to read their files on Mac.
If you've ever opened a .md file on your Mac and wished it just looked right, that's the problem OpenMark solves.
Pricing
$9.99. One time. No subscription, no tiers, no "pro" upgrade.
You buy it, you own it. Updates are included. There's no account to create, no email to enter, no onboarding flow. Install it, open a file, done. We wrote more about why we chose this model if you're curious about the reasoning.
What's Next
OpenMark is shipping and stable, but it's not done. Here's what's coming:
More themes. The editor currently supports dark mode with a clean default theme. More syntax highlighting themes and document styles are in progress.
Improved table editing. Tables in markdown are famously tedious to write by hand. We're working on better tooling for creating and editing markdown tables directly in the editor.
Performance on large files. OpenMark already handles typical markdown files without any lag, but we're optimizing for very large documents — 10,000+ line files with lots of code blocks and diagrams.
Try It
If you work with markdown files on a Mac, give OpenMark a shot. It's on the Mac App Store, it's $9.99, and it does exactly what it says.