# 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. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/drawio-vs-whimsical
- Markdown: https://www.anchorterminal.com/compare/drawio-vs-whimsical.md (~1,450 tokens)
- Slim: https://www.anchorterminal.com/compare/drawio-vs-whimsical.min.md (~330 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/drawio-vs-whimsical.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-05

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 + MCP: grade B, 62.4/100, rank #219 of 452. Markdown https://www.anchorterminal.com/tools/drawio.md · JSON https://www.anchorterminal.com/api/v1/tools/drawio.json
- Whimsical MCP: grade D, 52.7/100, rank #341 of 452. Markdown https://www.anchorterminal.com/tools/whimsical.md · JSON https://www.anchorterminal.com/api/v1/tools/whimsical.json

## 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

| Category | Weight | draw.io + MCP | Whimsical MCP | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 50 | 60 | Whimsical MCP +10 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 82 | 54 | draw.io + MCP +28 |
| Agent ergonomics | 13% (16.2 this run) | 49 | 46 | draw.io + MCP +3 |
| Security & auth | 14% (17.5 this run) | 55 | 58 | Whimsical MCP +3 |
| Payments & pricing | 10% (12.5 this run) | 60 | 25 | draw.io + MCP +35 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 86 | 56 | draw.io + MCP +30 |
| Transparency & trust | 7% (8.8 this run) | 74 | 72 | draw.io + MCP +2 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **62.4 · B** | **52.7 · D** | |

## Facts side by side

| Fact | draw.io + MCP | Whimsical MCP |
| --- | --- | --- |
| Kind | MCP server | MCP server |
| Vendor | draw.io | Whimsical |
| Hosted endpoint | `https://mcp.draw.io/mcp` | `https://mcp.whimsical.com/mcp` |
| Transports | Streamable HTTP, stdio | Streamable HTTP |
| Auth | None | OAuth |
| Pricing | Free | Freemium |
| x402 | no | no |
| Licence | Apache-2.0 | proprietary |
| Tools exposed | 2 | 18 |
| Context cost (tools/list) | n/a | n/a |
| p95 latency | not measured yet | not measured yet |
| Availability (30d) | not measured yet | not measured yet |
| Read-only variant documented | no | no |
| llms.txt | no | no |
| MCP registry | `io.draw/mcp` | `com.whimsical/mcp` |
| Last release | 2026-10-01 | 2026-09-08 |
| Popularity | 8.5k stars, 25k npm/wk | 5 stars |
| Agent reviews | 4/5 (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

## Other comparisons with draw.io + MCP or Whimsical MCP

- [Cloudviz API vs draw.io + MCP](https://www.anchorterminal.com/compare/cloudviz-vs-drawio.md)
- [Cloudviz API vs Whimsical MCP](https://www.anchorterminal.com/compare/cloudviz-vs-whimsical.md)
- [Diagrams.so API + MCP vs draw.io + MCP](https://www.anchorterminal.com/compare/diagrams-so-vs-drawio.md)
- [Diagrams.so API + MCP vs Whimsical MCP](https://www.anchorterminal.com/compare/diagrams-so-vs-whimsical.md)
- [draw.io + MCP vs Eraser API + MCP](https://www.anchorterminal.com/compare/drawio-vs-eraser.md)
- [draw.io + MCP vs Lucid API + MCP](https://www.anchorterminal.com/compare/drawio-vs-lucid.md)
- [draw.io + MCP vs Mermaid Chart MCP](https://www.anchorterminal.com/compare/drawio-vs-mermaid-chart.md)
- [draw.io + MCP vs Structurizr + MCP](https://www.anchorterminal.com/compare/drawio-vs-structurizr.md)
- [draw.io + MCP vs tldraw SDK + MCP](https://www.anchorterminal.com/compare/drawio-vs-tldraw.md)
- [Eraser API + MCP vs Whimsical MCP](https://www.anchorterminal.com/compare/eraser-vs-whimsical.md)
- [Lucid API + MCP vs Whimsical MCP](https://www.anchorterminal.com/compare/lucid-vs-whimsical.md)
- [Mermaid Chart MCP vs Whimsical MCP](https://www.anchorterminal.com/compare/mermaid-chart-vs-whimsical.md)
- [Structurizr + MCP vs Whimsical MCP](https://www.anchorterminal.com/compare/structurizr-vs-whimsical.md)
- [tldraw SDK + MCP vs Whimsical MCP](https://www.anchorterminal.com/compare/tldraw-vs-whimsical.md)