When your AI editor needs its own editor

What it does

ColaMD is a cross-platform, open-source Markdown editor that renders your formatting directly as you type—no split-pane preview required. It opens local .md files and keeps them in sync on disk, but its main pitch is live agent awareness: when Claude Code, Cursor, Copilot, or another AI tool writes to the file, the editor updates in real time and flashes a subtle titlebar dot while the agent is active.

The interesting bit

Instead of treating AI output as something you paste in, ColaMD treats agent writes as a first-class input stream. The app deliberately avoids trapping you in its ecosystem; the README explicitly notes it works alongside Obsidian, Typora, and VS Code, sharing standard Markdown files without proprietary lock-in. The interface is equally stubborn about minimalism—no toolbar, no permanent sidebar.

Key highlights

• True WYSIWYG editing: type Markdown syntax and see rich text immediately.
• Live agent sync with an activity indicator in the titlebar for agent writes.
• Twelve built-in themes drawing from Bear, Notion, iA Writer, Nord, Gruvbox, and Dracula.
• Exports to themed PDF, self-contained HTML, Word, and paginated reading-page PNGs.
• Mermaid diagrams, KaTeX math, clickable task lists, and VS Code integration to open files directly.

Verdict

Grab it if you want a clean, distraction-free surface for reviewing or co-writing AI-generated Markdown. Hardcore terminal dwellers who never leave Neovim can safely skip it.