SimpleMD is a minimalist markdown editor designed for use within Chrome, providing users with a fast and efficient writing experience directly from the browser's side panel. It features real-time markdown preview, allowing for instant rendering of text as it is typed. The clean interface minimizes distractions, making it ideal for focused writing sessions.

Among its notable features are support for Mermaid diagrams, enabling the creation of flowcharts and sequence diagrams, as well as KaTeX for rendering math formulas. Users can enjoy syntax highlighting for code blocks, multiple export options including PDF and PNG, and Google Drive synchronization for easy access to notes. The tool also offers both dark and light themes and functions offline, ensuring that notes are saved locally. Full-window mode is available for those who prefer a more immersive writing experience.