Mermaid
Text-based diagramming platform with AI and a visual editor
What is Mermaid?
Mermaid is the commercial diagramming platform from Mermaid Chart, the team behind the open-source Mermaid.js library. Diagrams can be written in Mermaid syntax, generated by AI from a prompt or a document, or adjusted in a visual editor, and the code and the canvas stay linked. It covers flowcharts, sequence diagrams, ER diagrams, Gantt charts, mind maps and other types, with live co-editing, slide presentations and plugins for code editors and documentation tools.
Mermaid has a free plan. Paid plans start at $10 per user / month, billed annually ($120 a year). See every plan
Good for
- Developers who already write Mermaid syntax in docs or Markdown
- Teams that want diagrams versioned and reviewed as text
- People who want AI to draft a diagram from a document or transcript
- Showing diagrams as slides without exporting them
Worth knowing
- The free Basic plan is listed as 3 diagrams on its plan card and up to 6 in the comparison table, with a limited diagram size and 15 AI credits.
- Paid plans are billed annually only; the vendor's FAQ says monthly plans are not available.
- AI credits are capped at 300 a year on Plus and 2,000 a year on Premium; only Enterprise is listed as unlimited.
- Free viewer seats start at Premium, and SSO, invoicing and a customer success manager are limited to Enterprise.
Key features
- Diagrams from Mermaid code
- Diagrams are written in Mermaid syntax and laid out automatically. Clicking a node jumps to its code and clicking the code finds its shape, so the two stay in step.
- Mermaid AI
- A description, an uploaded document or a pasted transcript becomes a first-draft diagram, and the AI suggests a fitting diagram type. Use is metered in credits below Enterprise.
- Visual Editor
- Nodes, edges, labels, colors and shapes can be changed by clicking and dragging while the code rewrites itself, with node alignment and movable edges for tidying a layout.
- Live co-editing and share links
- Teammates can co-edit a diagram at the same time, and a share link lets other people view it without logging in. Free viewer seats are part of Premium and Enterprise.
- Plugins and MCP server
- Plugins cover VS Code, JetBrains IDEs, Cursor, Windsurf, Confluence, Jira, Google Docs, Word and PowerPoint. An MCP server lets Claude, VS Code and Cursor generate diagrams.
- Presentations
- Existing diagrams become slides written in Markdown. A deck updates when its diagrams change and can be shared through a public link for viewing and comments.
Mermaid pricing
- Starts at
- $10 per user / month, billed annually ($120 a year)
- Free plan
- Basic plan: 3 diagrams (the comparison table on the same page says up to 6) with a limited diagram size, 15 AI credits, one team and project, and co-editing and external sharing.
- Free trial
- Free trial of Plus or Premium; the vendor does not state how long it lasts
| Plan | Price | What you get |
|---|---|---|
| Basic | $0 | 3 diagrams with a limited diagram size, 15 AI credits, and one team and project. Co-editing and external sharing are included. |
| Plus | $10per user / month, billed annually ($120 a year) | Unlimited diagrams with no size limit and 300 AI credits per year, for individuals who diagram often. |
| Premium | $20per user / month, billed annually ($240 a year) | Everything in Plus, plus 2,000 AI credits per year, unlimited free viewer seats, and unlimited teams and projects. |
| Enterprise | Custom | Everything in Premium, plus SSO, custom contracts and invoicing, IP management, user consolidation and a dedicated customer success manager. |
Read from mermaid.ai on Oct 6, 2026. Prices change, so confirm with Mermaid before you buy.
Works with
- VS Code
- JetBrains IDEs
- Cursor
- Claude Code
- ChatGPT
- Confluence
- Jira
- Google Docs
Mermaid alternatives
- Mermaid vs Eraser
Free plan · from $15/mo
- Mermaid vs Lucidchart
Free plan · from $9/mo
- Mermaid vs Whimsical
Free plan · from $10/mo
- Mermaid vs Excalidraw
Free plan · from $6/mo
Common questions
Is Mermaid free?
Mermaid has a free plan. Basic plan: 3 diagrams (the comparison table on the same page says up to 6) with a limited diagram size, 15 AI credits, one team and project, and co-editing and external sharing. Paid plans start at $10 per user / month, billed annually ($120 a year).
How much does Mermaid cost?
Mermaid lists 4 plans. Basic: $0. Plus: $10 per user / month, billed annually ($120 a year). Premium: $20 per user / month, billed annually ($240 a year). Enterprise: custom pricing. Prices were read from mermaid.ai on Oct 6, 2026.
What platforms does Mermaid work on?
Mermaid is available on Web.
Does Mermaid have an Android app?
No Android app was listed when its pages were read on Oct 6, 2026. Mermaid is listed for Web.
Does Mermaid have an iPhone app?
No iPhone app was listed when its pages were read on Oct 6, 2026. Mermaid is listed for Web.
Is Mermaid open source?
Mermaid is not described as open source on its own site, as read on Oct 6, 2026.
What does Mermaid integrate with?
Mermaid's listing names VS Code, JetBrains IDEs, Cursor, Claude Code, ChatGPT, Confluence, Jira and Google Docs. A listing names up to eight integrations, so it may connect to more.
Does Mermaid have a free trial?
Yes. Free trial of Plus or Premium; the vendor does not state how long it lasts.
Who makes Mermaid?
Mermaid is made by Mermaid Chart.
What are the alternatives to Mermaid?
The closest alternatives to Mermaid in our directory are Eraser, draw.io, Lucidchart, Whimsical and Excalidraw. Each one has a side-by-side comparison with Mermaid.
Sources for this page
The prices, plans, platforms and features above were read from these pages on Oct 6, 2026.