macOS shows Markdown files as raw text. QuickMark adds a Quick Look extension: select any Markdown file, hit Space, and it renders with tables, code, Mermaid and math. It grew into a full editor for Mac, iPhone and iPad, with split view, tabs, export to PDF, Word, HTML, EPUB and PNG, and one-tap publishing to a read-only link. Reading and writing are free, no account, and files stay on your device.
