You deserve Mardo.

The native Markdown viewer for Mac.

  • Spacebar beautiful Markdown.
  • Make enormous files feel small.
  • Watch AI edit them live.
  • Free to view. Forever.

Install with Homebrew

Run this in Terminal.

brew install --cask flooflogic/tap/mardo

Prefer a direct download? Download Mardo

macOS 14+ · Apple silicon and Intel · No account

See it workQuick Look setup

Select a Markdown file in Finder. Press Space.
Tables, code, diagrams, and math. Already beautiful.

Your AI writes.
You see it.

Keep a plan open in Quick Look while Claude Code, Codex, or your favorite tool works on it.

A word changes. A sentence arrives. A whole section becomes something new. Mardo follows it live.

Stay right where you’re reading. The changes come to you, even in a Finder preview.

MarkEngineV3

The engine
Markdown deserves.

Mardo doesn’t wrap a web page and call it native. It runs on MarkEngineV3—a complete document and rendering engine we built from scratch for one job: make Markdown feel impossibly fast, exact, and at home on the Mac.

No WebView. No JavaScript engine. No third-party runtime. Nothing borrowed in the hot path.

Built-in themes: MardoDark, MardoLight, GitHubLight, GitHubDark, and FloofLogic.

3.11 ms
Median first paint on an adversarial 16 MiB document.
44.6 MiB
The whole app, with a 50 GiB file open.
57.5 ms
Finder Quick Look, at any file size.
54,065
Editing cases tested against the Mac. Zero divergences.

The window, Quick Look, thumbnails, clipboard, HTML, PDF, and print all come from the same engine. One source. One renderer. Every surface agrees.

Engineered for awesome. Measured in public. Good for no reason.

How MarkEngineV3 worksSee the benchmarks

Big file.
Small wait.

A README is easy. Your agent’s enormous transcript should be, too.

Watch Mardo race through a 50 GiB Markdown file, jump halfway down, and keep scrolling.

Plans, logs, generated docs, and agent memory. Open the file you have. Start reading.

Room to
breathe.

Go full screen. Enter Zen. Let the document have your attention.

The controls fade away; your words stay. Pick your theme, settle into a comfortable text size, and enjoy the read.

Also all the other stuff.

Preview and copy Markdown in Finder. Read enormous documents. Jump straight to a heading. Open a file at an exact line from Terminal. Follow changes as another app saves. Revisit recent saves with Timewarp. Compare and resolve conflicting edits. Search and replace giant documents. Edit rendered Markdown or source. Paste spreadsheets as tables. Turn copied rich text into Markdown. Read diagrams and math. Export PDF and standalone HTML. Make and share custom themes. Focus on your document in Zen Mode. Let your AI read selected text.

Free to view.
Forever.

Give every Markdown file on your Mac a better place to be read.

Install with Homebrew

Prefer a direct download? Download Mardo