AI Mermaid flowchart

What is MermaidGo?

MermaidGo is a free online Chinese Mermaid editor launched by MIN2K.

It combines Mermaid code editing, real-time preview, as well as AI-powered chart generation, modification, and correction in a single web page.

Main functions

• Enter a natural language description to have AI generate Mermaid chart code.
• Edit Mermaid text directly and view the rendered result in real time.
• Use AI to modify the structure, nodes, and representation of existing charts.
• It assists in locating and fixing errors in the code.
• Refer to the Chinese documentation to learn about different chart types and configurations.
• Browse common process and chart structures through the template library.

Supported chart types

AI-generated chart workflow

1. First, select a flowchart, sequence diagram, Gantt chart, or another type of diagram.
2. List the participants, nodes, relationships, order, and branching conditions in short sentences.
3. Explain the direction of the chart, its hierarchy, titles, and the elements that need to be highlighted.
4. Let AI generate the first version of the Mermaid code.
5. Check in the real-time preview to ensure that the nodes, connections, and text are correct.
6. Modify incorrect structures and labels either through AI or manually.
7. Break down complex charts into sub-charts to reduce intersecting lines.
8. Copy the code or export the results, then insert them into documents and presentation materials.

How to write prompts

The more the prompt aligns with structured requirements, the easier it is to maintain the resulting Mermaid code.

• First, specify the type of diagram, such as a business process diagram from left to right.
• List the start, processing, decision, exception, and end nodes one by one.
• Identify each branch condition and the point of convergence.
• A sequence diagram should list the participants and the order in which messages are sent.
• A Gantt chart should show tasks, start dates, duration, and dependencies.
• Do not combine background information with chart nodes in the same long paragraph.

Mermaid code editing

Mermaid uses text similar to Markdown to define charts; simply by modifying the text, the chart can be rendered again.

• The flowchart can be arranged in a top-to-bottom or left-to-right direction.
• Node shapes are used to distinguish steps, judgments, data, and beginnings and endings.
• Subgraphs are useful for dividing complex systems into multiple modules.
• Theme settings allow you to adjust colors, borders, fonts, and connection lines.
• Newer versions support icons, images, architecture diagrams, and Kanban, among other formats.
• Experimental grammar may vary across different versions.

Common grammar issues

Which users are it suitable for

• Developer: Draws system workflows, interface timings, and software architecture.
• Product Manager: Organizes business processes, statuses, and user journeys.
• Project manager: Use Gantt charts to display task plans and dependencies.
• Teachers and students: Creating knowledge structures and classroom diagrams.
• Researchers: Organize the framework of the paper, as well as the methods and relationships between variables.
• Technical writer: Keep charts in sync with Markdown documents.

Price

As of August 30, 2026, the official product description identifies MermaidGo as a free online Chinese editor.

• The current public page does not display membership packages or fixed pricing.
• The number of AI calls, as well as the rules regarding models and future quotas, are not yet available publicly.
• If there are new prompts regarding login, points, or payment on the page, the current interface should be used as the reference.
• Before using it, the business team should verify the stability of the service and the data-related terms with the operation team.

Differences between MermaidGo and Mermaid.js

The use of the open-source Mermaid.js as the underlying technology does not mean that the MermaidGo website and its AI services are entirely open source.

Local deployment and developer access

When it is necessary to render charts on your own website or document system, Mermaid.js can be integrated directly.

• The official documentation specifies that for the npm method, Node.js version 16 or higher is required.
• The ES module can also be loaded and its configuration initialized via CDN.
• The deployment party is responsible for handling security levels, theme updates, and version upgrades on its own.
• MermaidGo does not yet provide any public API or official SDK.
• The AI generation capability cannot be automatically reproduced locally using Mermaid.js.

Usage restrictions and precautions

• AI may generate charts that are grammatically correct but contain errors in business logic.
• When generating complex processes in a single step, it is easy to overlook abnormal branches and loops.
• Differences in Mermaid versions may cause new syntax to fail to render.
• Online tools are not suitable for entering unmasked system architectures and business processes.
• Charts used in formal documents should be reviewed by the business manager prior to their use.
• Public templates can only serve as a structural reference and cannot replace actual needs analysis.

Frequently Asked Questions

What can MermaidGo do?

It can generate, modify, and fix diagrams such as flowcharts, sequence diagrams, and Gantt charts through code or AI.

Is MermaidGo free?

According to the official information, it is labeled as a free editor; no paid plans are shown on the public page.

Is it necessary to install software to use MermaidGo?

It’s not necessary; users can open it and use it directly in a browser on their computer or mobile device.

What types of charts does it support?

It supports flowcharts, sequence diagrams, class diagrams, state diagrams, Gantt charts, mind maps, and architecture diagrams, among others.

Does MermaidGo provide an API?

An independent API has not been made available yet; the Mermaid API mentioned in the documentation corresponds to the underlying Mermaid.js.

Is MermaidGo an open-source tool?

It has not been confirmed whether the online service is open-source, but the Mermaid.js it uses is an open-source charting library.

Do charts generated by AI need to be checked?

It is necessary to verify the nodes, branches, dependencies, timing, and business logic before using it officially.