# Cloudviz API vs Structurizr + MCP

> Structurizr + MCP has a score of 60.2 (C) against Cloudviz API's 37.9 (F). Both do diagram create. The largest gap is maintenance & community, 63 points. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/cloudviz-vs-structurizr
- Markdown: https://www.anchorterminal.com/compare/cloudviz-vs-structurizr.md (~1,500 tokens)
- Slim: https://www.anchorterminal.com/compare/cloudviz-vs-structurizr.min.md (~330 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/cloudviz-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: 2026-10-05

Structurizr + MCP has a score of 60.2 (C) against Cloudviz API's 37.9 (F). Both do diagram create. The largest gap is maintenance & community, 63 points.

- Cloudviz API: grade F, 37.9/100, rank #432 of 452. Markdown https://www.anchorterminal.com/tools/cloudviz.md · JSON https://www.anchorterminal.com/api/v1/tools/cloudviz.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 Cloudviz API for security & auth (+10).

Pick Structurizr + MCP for reliability (+53), agent ergonomics (+5), payments & pricing (+30), maintenance & community (+63), transparency & trust (+33).

## Score by category

| Category | Weight | Cloudviz API | Structurizr + MCP | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 20 | 73 | Structurizr + MCP +53 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 58 | 61 | Structurizr + MCP +3 |
| Agent ergonomics | 13% (16.2 this run) | 50 | 55 | Structurizr + MCP +5 |
| Security & auth | 14% (17.5 this run) | 53 | 43 | Cloudviz API +10 |
| Payments & pricing | 10% (12.5 this run) | 20 | 50 | Structurizr + MCP +30 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 5 | 68 | Structurizr + MCP +63 |
| Transparency & trust | 7% (8.8 this run) | 47 | 80 | Structurizr + MCP +33 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **37.9 · F** | **60.2 · C** | |

## Facts side by side

| Fact | Cloudviz API | Structurizr + MCP |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Cloudviz | Structurizr |
| Hosted endpoint | `https://api.cloudviz.io` | `https://mcp.structurizr.com/mcp` |
| Transports | HTTP | HTTP, Streamable HTTP |
| Auth | API key | OAuth or key |
| Pricing | Paid | Freemium |
| x402 | no | no |
| Licence | none | Apache-2.0 |
| Tools exposed | none | 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 | yes | no |
| llms.txt | no | no |
| MCP registry | not listed | not listed |
| Last release | none | 2026-09-19 |
| Popularity | none | 419 stars |
| Agent reviews | 2.5/5 (2) | 3/5 (2) |

## Verdicts

**Cloudviz API.** Diagrams come from the live AWS account through a read-only cross-account role with a per-customer external ID. AWS only, and API access starts at the $49 a month Team plan.

**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

### Cloudviz API

1. Call `GET /aws/accounts/` first to get the Cloudviz account ID, then request `/aws/accounts/{account-id}/{region}/{format}`
2. On a 202, wait and repeat the same GET until the diagram is ready
3. Ask for `jsonSnapshot` or `jsonDiagram` (there is no plain `json` format) when the agent has to reason over resources
4. Use a read-only key unless the agent has to add, change or delete AWS accounts

### 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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