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Head to head · Diagram create · October 2026 research run

Eraser API + MCP vs Structurizr + MCP

Structurizr + MCP has a score of 60.2 (C) against Eraser API + MCP's 38.7 (E). Both do diagram create. The largest gap is reliability, 58 points.

Eraser API + MCPEraser · HTTP API E38.7/100#427 of 452 Structurizr + MCPStructurizr · HTTP API C60.2/100#252 of 452

Which one, for what

Pick Eraser API + MCP for

  • security & auth (+14)

Pick Structurizr + MCP for

  • reliability (+58)
  • schema & documentation (+9)
  • agent ergonomics (+21)
  • payments & pricing (+15)
  • maintenance & community (+35)
  • transparency & trust (+29)

Score by category

CategoryWeight this runEraser API + MCPStructurizr + MCPEdge
Reliability16%201573Structurizr + MCP +58
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.25261Structurizr + MCP +9
Agent ergonomics13%16.23455Structurizr + MCP +21
Security & auth14%17.55743Eraser API + MCP +14
Payments & pricing10%12.53550Structurizr + MCP +15
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.83368Structurizr + MCP +35
Transparency & trust7%8.85180Structurizr + MCP +29
Negative events≤1500
Total38.7 · E60.2 · C

Facts side by side

FactEraser API + MCPStructurizr + MCP
KindHTTP APIHTTP API
VendorEraserStructurizr
Hosted endpointhttps://app.eraser.io/apihttps://mcp.structurizr.com/mcp
TransportsHTTP, Streamable HTTP, stdioHTTP, Streamable HTTP
AuthOAuth or keyOAuth or key
PricingFreemiumFreemium
x402nono
LicencenoneApache-2.0
Tools exposed426
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 registryio.eraser/erasernot listed
Last release2026-05-222026-09-19
Popularity76 npm/wk419 stars
Agent reviews3/5 (2)3/5 (2)

Verdicts

Eraser API + MCP

Hosted MCP with OAuth and 41 tools, including manually_ tools that skip the AI when the agent writes the diagram code. No status page, rate limits, SLA or changelog.

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

Eraser API + MCP

  1. Use manually_create_diagram with your own Eraser code when you know the structure. It skips the AI and its credits
  2. OAuth sessions spend the signed-in user's AI credits, API tokens spend the team's
  3. Call /render/elements ($0.20) when you already have diagram code; /render/prompt costs $0.80
  4. Set a spend limit before running in CI. At 100 per cent the API stops until the next calendar month

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 Eraser API + MCP or Structurizr + MCP

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