One Markdown is a free iPhone application developed by 禄海 区. It is a simple and fast editor that supports plain text, Markdown, and Textbundle. With its user-friendly interface and powerful features, One Markdown is a great tool for anyone who needs to work with text and Markdown files.

One Markdown fully supports the CommonMark standard and GitHub Flavored Markdown (GFM). This ensures compatibility with other Markdown editors and allows users to easily create well-formatted documents. The app provides syntax highlighting and parsing into HTML, making it easy to write and preview Markdown files. Even when working with large documents, One Markdown performs well and allows for smooth editing.

One Markdown also supports the display of images in the editor. Users can easily insert and view images in various formats such as jpeg, png, gif, webP, and HEIC. This feature enhances the visual appeal of documents and makes it easier to create visually engaging content.

In addition to its Markdown capabilities, One Markdown also supports the creation and editing of Textbundle documents. This allows users to organize their files in a convenient and structured manner, making it easier to manage and share their work.

Furthermore, One Markdown provides support for mathematical formulas, Echarts, and mermaid. This makes it a versatile tool for users who need to work with mathematical equations or create visualizations in their documents.

Overall, One Markdown is a lightweight and efficient editor for text and Markdown files. It offers a range of useful features and supports various file formats, making it a valuable tool for anyone working with text-based content.