Glassmark - Markdown Editor

Glassmark is a fast, native Markdown editor with a beautiful live preview. Open a folder, browse your Markdown files in the sidebar, and edit on the left while the rendered document keeps pace on the right.

It's built to do one thing exceptionally well: edit Markdown with a gorgeous, instant preview — calm, local, and private. There are no accounts and no cloud; your files stay on your Mac.

FEATURES

• Live preview that updates as you type, with scrolling that stays in sync with the editor.
• GitHub-flavoured Markdown: headings, bold and italic, tables, task lists, nested lists, blockquotes, footnotes, links, and images.
• Syntax-highlighted code blocks, beautifully typeset maths (KaTeX), and Mermaid diagrams — all rendered on-device, nothing fetched from the internet.
• In-editor syntax highlighting, auto-pairing of brackets, and automatic list continuation.
• Focus mode and typewriter scrolling for distraction-free writing.
• An outline panel to jump between headings, with the current section highlighted as you scroll.
• Multiple workspaces, fuzzy Quick Open, and full file management from the sidebar.
• Export your document to HTML or PDF.
• Light, Sepia, High Contrast, and Dark preview themes, plus your own custom CSS.

Glassmark is open source and built natively for macOS with SwiftUI. No tracking, no telemetry — nothing leaves your Mac.