Zenn Markdown Cheatsheet is a free Chrome extension designed to enhance the content creation experience on the Zenn platform. This tool provides a collapsible side panel in the editing interface, displaying the official Markdown guide with a convenient table of contents. Writers can quickly access Markdown syntax without needing to switch back and forth to external resources, thus improving workflow efficiency.

Key features include a constantly accessible cheat sheet, rapid navigation through the guide, and a smart layout that can be hidden when not in use. This extension supports both the article creation and editing pages, as well as individual scrap pages, making it a versatile tool for anyone looking to streamline their Markdown writing process.