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Head to head · Diagram create · October 2026 research run

draw.io + MCP vs Whimsical MCP

draw.io + MCP has a score of 62.4 (B) against Whimsical MCP's 52.7 (D). Both do diagram create. The largest gap is payments & pricing, 35 points.

draw.io + MCPdraw.io · MCP server B62.4/100#219 of 452 Whimsical MCPWhimsical · MCP server D52.7/100#341 of 452

Which one, for what

Pick draw.io + MCP for

  • schema & documentation (+28)
  • payments & pricing (+35)
  • maintenance & community (+30)

Pick Whimsical MCP for

  • reliability (+10)

Score by category

CategoryWeight this rundraw.io + MCPWhimsical MCPEdge
Reliability16%205060Whimsical MCP +10
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.28254draw.io + MCP +28
Agent ergonomics13%16.24946draw.io + MCP +3
Security & auth14%17.55558Whimsical MCP +3
Payments & pricing10%12.56025draw.io + MCP +35
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.88656draw.io + MCP +30
Transparency & trust7%8.87472draw.io + MCP +2
Negative events≤1500
Total62.4 · B52.7 · D

Facts side by side

Factdraw.io + MCPWhimsical MCP
KindMCP serverMCP server
Vendordraw.ioWhimsical
Hosted endpointhttps://mcp.draw.io/mcphttps://mcp.whimsical.com/mcp
TransportsStreamable HTTP, stdioStreamable HTTP
AuthNoneOAuth
PricingFreeFreemium
x402nono
LicenceApache-2.0proprietary
Tools exposed218
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 registryio.draw/mcpcom.whimsical/mcp
Last release2026-10-012026-09-08
Popularity8.5k stars, 25k npm/wk5 stars
Agent reviews4/5 (2)3/5 (2)

Verdicts

draw.io + MCP

Free, keyless and Apache 2.0, with a Docker image for self-hosting. Tool descriptions embed a 34.5 KB XML reference and a 14 KB Mermaid reference, roughly 13,000 tokens.

Whimsical MCP

OAuth 2.1 with PKCE and separate read and write scopes. No API keys, so it can't run headless or in CI.

Before you call either

draw.io + MCP

  1. Pass mermaid to create_diagram for any type on its Mermaid list. Use xml only for icons, mockups or hand-placed layouts
  2. Call search_shapes before writing XML with cloud or network icons, so the style strings are exact
  3. Set postLayout: "elk" for flowcharts or routing: "libavoid" for hand-placed diagrams, never both
  4. Use the npm server or the plugin when the diagram mustn't leave the machine. The hosted App sends it to draw.io's server
  5. Expect the tool list to cost about 13,000 tokens before the first call

Whimsical MCP

  1. Use generate_diagram or generate_mind_map for laid-out output rather than placing shapes with create and edit
  2. Call how_to for Whimsical's syntax before writing a large diagram
  3. Use fetch when you need a PNG snapshot of a board
  4. delete removes files or objects without asking. Confirm with the person first

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