Cascaii is a new, portable ASCII diagram builder developed using vanilla JavaScript, notable for its single HTML file structure, which makes it lightweight and accessible. User comments highlight its advantages over previous tools, particularly its convenience and ease of use. However, there are some concerns regarding the editing functionality, particularly issues with pasting content into the canvas, which could complicate the user experience. Many users expressed appreciation for its intuitive design and wished for enhanced features that could address current limitations. Overall, there's a positive reception, with users eager to incorporate it into their work processes, especially in areas that require diagrammatic communication.