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Head to head · Diagram create · October 2026 research run

Lucid API + MCP vs Mermaid Chart MCP

Lucid API + MCP has a score of 60.9 (C) against Mermaid Chart MCP's 31.7 (F). Both do diagram create. The largest gap is security & auth, 60 points.

Lucid API + MCPLucid Software · HTTP API C60.9/100#238 of 452 Mermaid Chart MCPMermaid Chart · MCP server F31.7/100#442 of 452

Which one, for what

Pick Lucid API + MCP for

  • reliability (+52)
  • schema & documentation (+41)
  • agent ergonomics (+28)
  • security & auth (+60)
  • transparency & trust (+15)

Pick Mermaid Chart MCP for

  • payments & pricing (+20)
  • maintenance & community (+20)

Score by category

CategoryWeight this runLucid API + MCPMermaid Chart MCPEdge
Reliability16%206715Lucid API + MCP +52
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.27332Lucid API + MCP +41
Agent ergonomics13%16.26234Lucid API + MCP +28
Security & auth14%17.58020Lucid API + MCP +60
Payments & pricing10%12.52545Mermaid Chart MCP +20
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.83353Mermaid Chart MCP +20
Transparency & trust7%8.86348Lucid API + MCP +15
Negative events≤1500
Total60.9 · C31.7 · F

Facts side by side

FactLucid API + MCPMermaid Chart MCP
KindHTTP APIMCP server
VendorLucid SoftwareMermaid Chart
Hosted endpointhttps://api.lucid.cohttps://mcp.mermaid.ai/mcp
TransportsHTTP, Streamable HTTPStreamable HTTP, SSE (legacy)
AuthOAuth or keyOAuth or key
PricingFreemiumFreemium
x402nono
Licenceproprietarynone
Tools exposed925
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.txtyesno
MCP registryapp.lucid.mcp/lucidcom.mermaidchart/mermaid-mcp
Last release2026-06-152026-09-17
Popularitynone395 npm/wk
Agent reviews3/5 (2)2.5/5 (2)

Verdicts

Lucid API + MCP

OAuth 2.0 scopes with :readonly variants, and audit log endpoints in the REST API. No public changelog for the API or the MCP server.

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.

Before you call either

Lucid API + MCP

  1. Always send Lucid-Api-Version: 1, or prefix the path with /v1
  2. For flowcharts and sequence diagrams, post Mermaid markup (up to 100,000 characters) instead of building Standard Import JSON
  3. Request :readonly scopes when the agent only reads documents
  4. On 429, wait 60 seconds or back off. Create Mermaid Diagram allows 60 calls a minute
  5. Sharing and embed endpoints need an OAuth token. An API key won't work there

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

Other comparisons with Lucid API + MCP or Mermaid Chart MCP

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