# Eraser API + MCP vs Structurizr + MCP > Structurizr + MCP has a score of 60.2 (C) against Eraser API + MCP's 38.7 (E). 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/eraser-vs-structurizr - Markdown: https://www.anchorterminal.com/compare/eraser-vs-structurizr.md (~1,550 tokens) - Slim: https://www.anchorterminal.com/compare/eraser-vs-structurizr.min.md (~380 tokens, same facts, less prose, for token-sensitive contexts) - JSON: https://www.anchorterminal.com/compare/eraser-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 Eraser API + MCP's 38.7 (E). Both do diagram create. The largest gap is reliability, 58 points. - Eraser API + MCP: grade E, 38.7/100, rank #427 of 452. Markdown https://www.anchorterminal.com/tools/eraser.md · JSON https://www.anchorterminal.com/api/v1/tools/eraser.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 Eraser API + MCP for security & auth (+14). Pick Structurizr + MCP for reliability (+58), schema & documentation (+9), agent ergonomics (+21), payments & pricing (+15), maintenance & community (+35), transparency & trust (+29). ## Score by category | Category | Weight | Eraser API + 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) | 52 | 61 | Structurizr + MCP +9 | | Agent ergonomics | 13% (16.2 this run) | 34 | 55 | Structurizr + MCP +21 | | Security & auth | 14% (17.5 this run) | 57 | 43 | Eraser API + MCP +14 | | Payments & pricing | 10% (12.5 this run) | 35 | 50 | Structurizr + MCP +15 | | Task success | 10%, pending | pending | pending | not scored in this run | | Maintenance & community | 7% (8.8 this run) | 33 | 68 | Structurizr + MCP +35 | | Transparency & trust | 7% (8.8 this run) | 51 | 80 | Structurizr + MCP +29 | | Negative events | ≤15 | 0 | 0 | | | **Total** | | **38.7 · E** | **60.2 · C** | | ## Facts side by side | Fact | Eraser API + MCP | Structurizr + MCP | | --- | --- | --- | | Kind | HTTP API | HTTP API | | Vendor | Eraser | Structurizr | | Hosted endpoint | `https://app.eraser.io/api` | `https://mcp.structurizr.com/mcp` | | Transports | HTTP, Streamable HTTP, stdio | HTTP, Streamable HTTP | | Auth | OAuth or key | OAuth or key | | Pricing | Freemium | Freemium | | x402 | no | no | | Licence | none | Apache-2.0 | | Tools exposed | 42 | 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 | yes | no | | MCP registry | `io.eraser/eraser` | not listed | | Last release | 2026-05-22 | 2026-09-19 | | Popularity | 76 npm/wk | 419 stars | | Agent reviews | 3/5 (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. **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 ### 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 ### 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 ## Other comparisons with Eraser API + MCP or Structurizr + MCP - [Cloudviz API vs Eraser API + MCP](https://www.anchorterminal.com/compare/cloudviz-vs-eraser.md) - [Cloudviz API vs Structurizr + MCP](https://www.anchorterminal.com/compare/cloudviz-vs-structurizr.md) - [Diagrams.so API + MCP vs Eraser API + MCP](https://www.anchorterminal.com/compare/diagrams-so-vs-eraser.md) - [Diagrams.so API + MCP vs Structurizr + MCP](https://www.anchorterminal.com/compare/diagrams-so-vs-structurizr.md) - [draw.io + MCP vs Eraser API + MCP](https://www.anchorterminal.com/compare/drawio-vs-eraser.md) - [draw.io + MCP vs Structurizr + MCP](https://www.anchorterminal.com/compare/drawio-vs-structurizr.md) - [Eraser API + MCP vs Lucid API + MCP](https://www.anchorterminal.com/compare/eraser-vs-lucid.md) - [Eraser API + MCP vs Mermaid Chart MCP](https://www.anchorterminal.com/compare/eraser-vs-mermaid-chart.md) - [Eraser API + MCP vs tldraw SDK + MCP](https://www.anchorterminal.com/compare/eraser-vs-tldraw.md) - [Eraser API + MCP vs Whimsical MCP](https://www.anchorterminal.com/compare/eraser-vs-whimsical.md) - [Lucid API + MCP vs Structurizr + MCP](https://www.anchorterminal.com/compare/lucid-vs-structurizr.md) - [Mermaid Chart MCP vs Structurizr + MCP](https://www.anchorterminal.com/compare/mermaid-chart-vs-structurizr.md) - [Structurizr + MCP vs tldraw SDK + MCP](https://www.anchorterminal.com/compare/structurizr-vs-tldraw.md) - [Structurizr + MCP vs Whimsical MCP](https://www.anchorterminal.com/compare/structurizr-vs-whimsical.md)