MarkdownEditor — a Mac-native Markdown editor

Welcome.md

Write on the left. It renders as you type.

Δv = v_e ln(m₀/m_f)

NORMAL Ln 1, Col 1

Why native

Because a text editor should feel weightless

Launches instantly

A small Swift binary, not a browser booting up. Cold start to cursor in well under a second.

A fraction of the memory

Electron editors idle at hundreds of megabytes to render text. AppKit doesn't.

Works offline

KaTeX, Mermaid, and highlight.js are bundled inside the app. Zero network calls, ever.

Features

ciw d2w .

Motions, operators, counts, text objects, visual mode, and the dot command. Off by default — flip it on in Settings.

$\Delta v = v_e \ln \frac{m_0}{m_f}$

Inline and block LaTeX rendered by KaTeX — and dollar amounts in prose stay dollar amounts.

```mermaid

Mermaid flowcharts and sequence diagrams, plus syntax-highlighted code blocks in the preview.

⇧⌘P

PDF that matches the preview exactly, self-contained single-file HTML, and Word with real headings and formatting.

⌘⇧O

Open a directory of Markdown as a project. The tree watches the filesystem and updates when files change.

CLAUDE.md

Markdown is the language LLMs read and write. Edit your agent instructions and read the reports they produce as documents, not raw source.

Screenshots

Free, open source, and a 5 MB download. Your RAM will thank you.

macOS 14 (Sonoma) or later · read how it was built