Mermaid Chart review

Mermaid Chart is a collaborative diagramming platform built on Mermaid.js. You can create diagrams by writing Mermaid syntax, prompting its AI, or using a visual editor, then share them with teammates. The product supports flowcharts, sequence diagrams, timelines, ER diagrams, and other diagram types.

The editing options matter if your team has mixed preferences. Developers can work in code and keep diagrams connected to their source; other users can adjust diagrams through visual controls such as node alignment and edge reattachment. AI generation can start from prompts, documents, or transcripts, rather than only from a blank canvas.

Mermaid Chart also offers an MCP server for generating, validating, and rendering diagrams from Claude, VS Code, and Cursor. That makes it relevant to teams already building diagram workflows around those tools, though the published material does not specify which plan includes MCP access.

Mermaid Chart’s main advantage is that it does not force a choice between code and a graphical editor. Mermaid syntax gives technical users a text-based way to create diagrams, while visual editing lets collaborators make changes without editing code. That combination is useful when the person who needs to review a flow is not the person who wrote it.

The collaboration features also fit team work better than a diagram tool built only for individual files: the product supports live co-editing and link sharing. Its AI can generate diagrams from prompts, documents, or transcripts, and its MCP server can generate, validate, and render diagrams through Claude, VS Code, and Cursor. The published material does not spell out MCP availability by plan, so check that before switching a team workflow over.

The Basic plan is free, and the paid plans remove the listed diagram-count and size limits. Plus lists unlimited diagrams and diagram size, along with 300 AI credits per year; Premium raises that to 2,000 credits and adds unlimited free viewer seats. For teams that need shared editing and recurring diagram work, those are clearer upgrade reasons than AI alone.

The biggest buying caveat is the Basic plan’s conflicting diagram cap. The plan overview lists 3 diagrams, while the comparison table says up to 6. Both list a diagram-size limit of 60, 15 AI credits, and creation of one team and project. We would not assume which diagram count applies without confirming it with Mermaid Chart.

Paid plans are annual-only, according to the published pricing information: Plus is $10 per user per month billed annually, and Premium is $20 per user per month billed annually. Plus includes 300 AI credits per year; Premium includes 2,000. Those are annual credit allowances, not monthly ones. Enterprise pricing is custom, and the free-trial status is not published on the vendor's site.

That makes the jump from free to paid less casual than the monthly prices suggest. If you only need a few simple diagrams, Basic may be enough, but its cap is unclear. If you need unlimited diagrams, larger diagrams, or more AI credits, budget for a full annual commitment per user.

Mermaid Chart has a free Basic plan, but its diagram cap is unclear: the plan overview says 3 diagrams, while the comparison table says up to 6. Basic also lists a size limit of 60, 15 AI credits, and one team and project creation.

Paid plans require annual billing. Plus costs $10 per user per month when billed annually and includes unlimited diagrams and size, with 300 AI credits per year. Premium is $20 per user per month, also billed annually. That $10-per-seat jump adds 1,700 annual AI credits, unlimited free viewer seats, and unlimited teams and project creation. Both plans include Basic features.

Enterprise pricing is custom and includes unlimited AI credits, SSO, IP management, custom contracts and invoicing, and a dedicated Customer Success Manager. The pricing details list no add-ons. There is no monthly paid option, so budget for annual billing; monthly equivalents are not listed as monthly-billed prices.

The published product information does not document import tools, migration services, or data-export formats, so we can’t confirm how easily existing diagrams move in or out. Mermaid Chart is built on Mermaid.js and supports Mermaid syntax, which may suit teams already working with that syntax. But the available details don’t say whether you can import existing files or export diagrams as editable Mermaid code.

Collaboration is a reason to switch in: teams can co-edit live and share diagrams by link. The MCP server can generate, validate, and render diagrams from Claude, VS Code, and Cursor. Whether those workflows replace your current setup depends on what you need to carry over; the migration path is not specified here.

We can’t attribute reasons for leaving to Reddit because no Reddit posts or comments were provided. The documented reasons to hesitate are clearer: paid plans are annual-only, lower plans have finite AI credits, and Basic’s diagram cap conflicts across the pricing details. Check export and import options with Mermaid Chart before moving a library of diagrams.