About

Mermaid Chart is a browser-based diagramming platform from Mermaid Chart Inc., the company behind the open-source Mermaid.js library. It addresses a common problem: engineers and analysts understand systems deeply but waste time dragging shapes in conventional diagram tools. Mermaid Chart lets users produce diagrams by writing plain-text syntax, prompting an AI assistant, or uploading a document, and the tool handles layout automatically.

The product is built on Mermaid.js, the MIT-licensed JavaScript rendering library created by Knut Sveidqvist, who went on to found the company. The commercial platform adds a visual editor, real-time co-editing, AI generation, team workspaces, and enterprise controls on top of the free library. Users can start from a blank canvas, a prompt, a pasted transcript, or existing code, and the resulting diagrams can be embedded in documentation, wikis, and IDEs. The company states the platform is used by more than 5 million people across over 200,000 companies.

Key Features

Diagrams as code: Users write diagram definitions in Mermaid's Markdown-style syntax, and the tool renders and lays out the diagram automatically, which makes diagrams easy to version in Git and review as text.

Mermaid AI: Diagrams can be generated from plain-language prompts, uploaded documents such as PRDs, or meeting transcripts, with conversational context maintained so the diagram evolves through follow-up requests.

Visual editor: The canvas supports click-and-drag editing, node alignment, and reattaching edges without rewriting code, while keeping the code panel and the drawing in sync.

Real-time collaboration: Multiple people can co-edit live, and diagrams can be shared through a single link that viewers can open without logging in.

Integrations: Plugins and apps cover VS Code, JetBrains IDEs, GitHub Copilot, Confluence, Jira, Google Docs, Microsoft Word and PowerPoint, and an MCP server connects the tool to Claude, Cursor, and other AI assistants.

Multiple diagram types: Supported formats include flowcharts, sequence diagrams, ER diagrams, Gantt charts, timelines, mind maps, org charts, state diagrams, Git graphs, class diagrams, and pie charts.

Security and enterprise controls: The platform lists access controls, encryption, SOC 2 compliance, SSO, custom contracting, IP management, and a dedicated customer success manager on higher tiers.

Pricing & Fees

Pricing: A free Basic plan, Plus at $10 per user per month, Premium at $20 per user per month (both billed annually), and Enterprise at custom pricing; the free tier includes up to 6 diagrams with limited size and 15 AI credits.
AI credits: Paid plans include annual AI credits — 300 on Plus and 2,000 on Premium — with unlimited AI use listed for Enterprise (subject to the vendor's terms).
Free Live Editor: A separate free browser editor at mermaid.live lets anyone write and preview Mermaid syntax without an account, and no paid plan is required to use the open-source syntax itself.
Presentations: Diagrams can be turned into slide decks within the product and shared via public links, without exporting to a separate presentation tool.

Who It's For

Mermaid Chart is aimed at people who think in systems: developers mapping features and workflows, system architects designing structures with C4 and ER diagrams, DevOps engineers diagramming CI/CD pipelines, and QA engineers visualizing test flows. It also serves project managers building Gantt charts and timelines, data and business analysts documenting processes, technical writers maintaining documentation, consultants aligning stakeholders, and educators preparing lessons. The text-based approach particularly suits teams that already keep diagrams in version control alongside code.

FAQ

What is Mermaid Chart?Mermaid Chart is a commercial collaborative diagramming platform built on the open-source Mermaid.js library, combining text-based diagram syntax, a visual editor, and AI generation for flowcharts, sequence diagrams, ER diagrams, and more.

Is there a free plan?Yes, the Basic plan is free and includes up to 6 diagrams with limited diagram size, 15 AI credits, and one team and project creation; the underlying Mermaid syntax also remains free and open source.

How much does a paid plan cost?Plus costs $10 per user per month and Premium costs $20 per user per month, both billed annually, while Enterprise uses custom pricing obtained by contacting sales.

Which tools does Mermaid Chart integrate with?It offers plugins and apps for VS Code, JetBrains IDEs, GitHub Copilot, Confluence, Jira, Google Docs, Microsoft Word and PowerPoint, and an MCP server for working with AI assistants such as Claude and Cursor.

How does Mermaid Chart handle security and privacy?The vendor lists secure access controls, encryption, SOC 2 compliance, and SSO, with Enterprise plans adding custom contracts, IP management, and a dedicated customer success manager.

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Key Features

Pricing & Fees

Who It's For

FAQ

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