MermaidEditor 4+

Write diagram on all devices

基伟 徐

    • $3.99


MermaidEditor is a diagram and chart editor, powered by mermaid-js.

MermaidEditor supports mermaid-js syntax highlighting and code completion, so it can help writing diagram and chart clearly, easily and quickly.

You can also easily export charts as PNG images or SVG files from the editor, or share image to other people with system actions.


- Syntax highlighting for mermaid-js grammar
- Code completion and code snippets in editor
- Auto generate preview images when typing in editor
- Instant parsing error indicator in editor
- Zoom and move in preview for checking diagram's detail
- Export to PNG or SVG with one click
- Edit multiple files in one window

For mermaid-js grammar, please visit for documentation.

What’s New

Version 1.8.0

- Added code block folding feature to the text editor

Ratings and Reviews

3.1 out of 5
7 Ratings

7 Ratings

Jrwright ,

Decent, but could use some improvements

Basically functions well.
- 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.
- 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)

the_disappointed_merman ,

Don‘t waste your time and money

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.

JeffK517 ,

Doesn't Support mmd Files

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

App Privacy

The developer, 基伟 徐, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    Up to six family members can use this app with Family Sharing enabled.

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