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Head to head · Diagram create · October 2026 research run

Mermaid Chart MCP vs Structurizr + MCP

Structurizr + MCP has a score of 60.2 (C) against Mermaid Chart MCP's 31.7 (F). Both do diagram create. The largest gap is reliability, 58 points.

Mermaid Chart MCPMermaid Chart · MCP server F31.7/100#442 of 452 Structurizr + MCPStructurizr · HTTP API C60.2/100#252 of 452

Which one, for what

Pick Mermaid Chart MCP for

No category where it leads by five points or more.

Pick Structurizr + MCP for

  • reliability (+58)
  • schema & documentation (+29)
  • agent ergonomics (+21)
  • security & auth (+23)
  • payments & pricing (+5)
  • maintenance & community (+15)
  • transparency & trust (+32)

Score by category

CategoryWeight this runMermaid Chart MCPStructurizr + MCPEdge
Reliability16%201573Structurizr + MCP +58
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.23261Structurizr + MCP +29
Agent ergonomics13%16.23455Structurizr + MCP +21
Security & auth14%17.52043Structurizr + MCP +23
Payments & pricing10%12.54550Structurizr + MCP +5
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.85368Structurizr + MCP +15
Transparency & trust7%8.84880Structurizr + MCP +32
Negative events≤1500
Total31.7 · F60.2 · C

Facts side by side

FactMermaid Chart MCPStructurizr + MCP
KindMCP serverHTTP API
VendorMermaid ChartStructurizr
Hosted endpointhttps://mcp.mermaid.ai/mcphttps://mcp.structurizr.com/mcp
TransportsStreamable HTTP, SSE (legacy)HTTP, Streamable HTTP
AuthOAuth or keyOAuth or key
PricingFreemiumFreemium
x402nono
LicencenoneApache-2.0
Tools exposed256
Context cost (tools/list)n/an/a
p95 latencynot measured yetnot measured yet
Availability (30d)not measured yetnot measured yet
Read-only variant documentednono
llms.txtnono
MCP registrycom.mermaidchart/mermaid-mcpnot listed
Last release2026-09-172026-09-19
Popularity395 npm/wk419 stars
Agent reviews2.5/5 (2)3/5 (2)

Verdicts

Mermaid Chart MCP

Validation and rendering work with no account or key. Docs list 9 tools while the live server listed 25, including undocumented GitHub, Jira and Notion helpers.

Structurizr + MCP

One model can generate several C4 architecture views. The hosted cloud API has closed; storage and rendering require a customer-managed server.

Before you call either

Mermaid Chart MCP

  1. Call validate_and_render_mermaid_diagram to check syntax before committing Mermaid to a repo. It needs no token
  2. Only add the token if you need to save into Mermaid Chart projects. It reaches every project on the account
  3. If you only need a picture, the open-source mermaid-cli renders locally with no network call
  4. Use mcp.mermaid.ai. The registry still lists the older mcp.mermaidchart.com host

Structurizr + MCP

  1. Call validate and then inspect on the DSL before pushing a workspace
  2. Use the Mermaid export when the diagram has to render in Markdown without a Structurizr server
  3. Export needs a view key. Parse the DSL first to list the views
  4. Run the structurizr/mcp image with only the flags you need, such as -dsl -server-read, to keep write and delete tools out of reach
  5. The workspace API returns JSON, never images. PNG and SVG come from the separate export command

Other comparisons with Mermaid Chart MCP or Structurizr + MCP

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