No way to get any useful interactions in or out of this without a clipboard.

This is a basic app that utilizes the Mermaid JS descriptor language. (You can Google "mermaid-js" online for a complete syntax guide; that's what I did.) By "basic", I mean you can input line-by-line Mermaid JS syntax and it will render the diagram. You can also paste into the syntax editor area. (I tested this, because a one-star reviewer claimed otherwise. I copied-and-pasted a complete diagram into a new document, and it rendered fine. I am on an "M1" iPad Pro. Perhaps that matters?) Why am I giving it five stars while another gave it one? Because it is literally exactly what I needed. It is a very simple mermaid-js editor and renderer. There are no bells. There are no whistles. I did not need to copypasta from elsewhere, in fact. I only needed to type in my diagram to see it graphically. This app can generate an SVG from the diagram, but I would have been happy if I could have only screen-captured it. So, I'm happy with the app. I have been working on a difficult problem at work. Visually tying together existing components diagrammatically made life easier because I could determine which existing components to use, and which pieces of code I still needed to write. This app was helpful for me.

Cannot paste diagrams, basic function

Basically functions well. Pros: - Live editing. - Double-clicking an .mmd file does open the app, despite the other review. - pan and zoom of the diagram supported, though panning requires a click-and-hold, which is unatural for typical trackpad behavior on a Mac app (compare to the Maps app). - Generates diagrams from standard templates. - Link to the MermaidJS docs. Cons: - The cursor is almost invisible in the editor. I'm constantly losing track of it. - Needs better support for light/dark themes (this may help the cursor issue). - Large state diagram didn't render, and no errors were displayed. - Code completion only works for Mermaid key words, not user-defined symbols (compare to the official Live Editor)

Despite the first screenshot, the app doesn't actually support opening .mmd files, which really limits its utility.

PSA: Don‘t waste your time and money. The editor does not have clipboard functionality, so unless you are into typing mermaid files from scratch this app is useless.