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Head to head · Diagram create · October 2026 research run

Eraser API + MCP vs Whimsical MCP

Whimsical MCP has a score of 52.7 (D) against Eraser API + MCP's 38.7 (E). Both do diagram create. The largest gap is reliability, 45 points.

Eraser API + MCPEraser · HTTP API E38.7/100#427 of 452 Whimsical MCPWhimsical · MCP server D52.7/100#341 of 452

Which one, for what

Pick Eraser API + MCP for

  • payments & pricing (+10)

Pick Whimsical MCP for

  • reliability (+45)
  • agent ergonomics (+12)
  • maintenance & community (+23)
  • transparency & trust (+21)

Score by category

CategoryWeight this runEraser API + MCPWhimsical MCPEdge
Reliability16%201560Whimsical MCP +45
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.25254Whimsical MCP +2
Agent ergonomics13%16.23446Whimsical MCP +12
Security & auth14%17.55758Whimsical MCP +1
Payments & pricing10%12.53525Eraser API + MCP +10
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.83356Whimsical MCP +23
Transparency & trust7%8.85172Whimsical MCP +21
Negative events≤1500
Total38.7 · E52.7 · D

Facts side by side

FactEraser API + MCPWhimsical MCP
KindHTTP APIMCP server
VendorEraserWhimsical
Hosted endpointhttps://app.eraser.io/apihttps://mcp.whimsical.com/mcp
TransportsHTTP, Streamable HTTP, stdioStreamable HTTP
AuthOAuth or keyOAuth
PricingFreemiumFreemium
x402nono
Licencenoneproprietary
Tools exposed4218
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/erasercom.whimsical/mcp
Last release2026-05-222026-09-08
Popularity76 npm/wk5 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.

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

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

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

Other comparisons with Eraser API + MCP or Whimsical MCP

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