A free, offline reader for Mac, iPad, iPhone — and for your browser. No account, no subscription, no network permission.
Markdown is now generated faster than anyone can read it. README files, docs, LLM output — you open them in an editor that wants a workspace, or in a viewer that shows a spinner when the Wi-Fi drops, or in a reader that charges for a dark theme.
Mdown opens the file and renders it. That is the entire product. No workspace, no account, no purchase, and no network permission — so the same README looks the same on a plane as it does at your desk.
Mdown ships without the network permission — this isn't a promise about data collection, it's the absence of the capability. Every one of the 192 syntax grammars, both diagram engines and all the fonts live inside the binary, so nothing is ever fetched.
Nine built-in themes, serif or sans or rounded body text, four monospaced faces for code, and a separate palette for syntax if you want the code to look different from the page. Column width, line height and margins are yours to set — in a category that sells dark mode as an upgrade.
Save the file in VS Code, Cursor or Zed and Mdown re-reads it immediately, keeping your place, your selection and your search. Press ⌘E to hand the file back to the editor — Mdown never writes to it.
Find in the rendered document with a real match counter, not a search of the raw source. A contents panel with the actual heading hierarchy, a word count and a reading time, and your position remembered per file — it survives a change of font or width, because the anchor is the block, not the pixel.
Detail at 2× · contents, match counter, status bar
Try it here — click a theme, drag the width, press Space for the source.
Everything you just touched is free, offline and in the app.
Universal for Mac, iPad and iPhone; on macOS, pressing Space on a .md file in the Finder draws it with the same renderer without launching the app. The browser extension renders .md on any site and in local files with the same nine themes — so a raw GitHub link stops being a wall of plain text.
Windows and Android: we're exploring them. Nothing promised, nothing dated.
Free on the Mac App Store, or add the extension to your browser. No account, no sign-in, nothing to configure.
Double-click any .md, or press Space on it in the Finder. It opens as fast as it opens, because nothing is fetched.
Park it on the second monitor beside your editor. Save, and the view updates without moving your place.
Mdown is open source under the MIT licence. The reason the promises above are checkable is that you can read the code that keeps them — the build fails if the network entitlement ever appears.
The source travels with the licence; the repository is public on GitHub.
The build fails if the network entitlement ever appears in the app.
The parsing, TOC, search and scroll-anchor engines are covered by the test suite that gates every release.
A product of ZeroSix Studio.
Yes, and it cannot do otherwise. The app is built without the network entitlement, and the build fails if anyone adds it. Syntax highlighting, diagrams, maths and fonts are all bundled, so a README renders identically on a plane.
Free for Mac, iPad and iPhone, free for your browser, open source, offline. Nothing to sign up for.
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