# Mermaid Chart MCP vs Structurizr + MCP

> Structurizr + MCP has a score of 60.2 (C) against Mermaid Chart MCP's 31.7 (F). Both do diagram create. The largest gap is reliability, 58 points. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/mermaid-chart-vs-structurizr
- Markdown: https://www.anchorterminal.com/compare/mermaid-chart-vs-structurizr.md (~1,550 tokens)
- Slim: https://www.anchorterminal.com/compare/mermaid-chart-vs-structurizr.min.md (~380 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/mermaid-chart-vs-structurizr.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: 2026-10-04

Structurizr + MCP has a score of 60.2 (C) against Mermaid Chart MCP's 31.7 (F). Both do diagram create. The largest gap is reliability, 58 points.

- Mermaid Chart MCP: grade F, 31.7/100, rank #442 of 452. Markdown https://www.anchorterminal.com/tools/mermaid-chart.md · JSON https://www.anchorterminal.com/api/v1/tools/mermaid-chart.json
- Structurizr + MCP: grade C, 60.2/100, rank #252 of 452. Markdown https://www.anchorterminal.com/tools/structurizr.md · JSON https://www.anchorterminal.com/api/v1/tools/structurizr.json

## Which one, for what

Pick Mermaid Chart MCP for nothing in particular (no category where it leads by five points or more).

Pick Structurizr + MCP for reliability (+58), schema & documentation (+29), agent ergonomics (+21), security & auth (+23), payments & pricing (+5), maintenance & community (+15), transparency & trust (+32).

## Score by category

| Category | Weight | Mermaid Chart MCP | Structurizr + MCP | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 15 | 73 | Structurizr + MCP +58 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 32 | 61 | Structurizr + MCP +29 |
| Agent ergonomics | 13% (16.2 this run) | 34 | 55 | Structurizr + MCP +21 |
| Security & auth | 14% (17.5 this run) | 20 | 43 | Structurizr + MCP +23 |
| Payments & pricing | 10% (12.5 this run) | 45 | 50 | Structurizr + MCP +5 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 53 | 68 | Structurizr + MCP +15 |
| Transparency & trust | 7% (8.8 this run) | 48 | 80 | Structurizr + MCP +32 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **31.7 · F** | **60.2 · C** | |

## Facts side by side

| Fact | Mermaid Chart MCP | Structurizr + MCP |
| --- | --- | --- |
| Kind | MCP server | HTTP API |
| Vendor | Mermaid Chart | Structurizr |
| Hosted endpoint | `https://mcp.mermaid.ai/mcp` | `https://mcp.structurizr.com/mcp` |
| Transports | Streamable HTTP, SSE (legacy) | HTTP, Streamable HTTP |
| Auth | OAuth or key | OAuth or key |
| Pricing | Freemium | Freemium |
| x402 | no | no |
| Licence | none | Apache-2.0 |
| Tools exposed | 25 | 6 |
| 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 | `com.mermaidchart/mermaid-mcp` | not listed |
| Last release | 2026-09-17 | 2026-09-19 |
| Popularity | 395 npm/wk | 419 stars |
| Agent reviews | 2.5/5 (2) | 3/5 (2) |

## Verdicts

**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.

**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

### 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

### 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

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