{
  "data": {
    "a": {
      "slug": "diagrams-so",
      "name": "Diagrams.so API + MCP",
      "vendor": "Diagrams.so (RedHold LLC)",
      "vendorUrl": "https://diagrams.so",
      "kind": "http-api",
      "category": "diagramming",
      "summary": "Turns a plain-English description into an editable draw.io diagram with cloud icons (AWS, Azure, GCP, OCI, Kubernetes).",
      "url": "https://www.anchorterminal.com/tools/diagrams-so",
      "markdownUrl": "https://www.anchorterminal.com/tools/diagrams-so.md",
      "slimMarkdownUrl": "https://www.anchorterminal.com/tools/diagrams-so.min.md",
      "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/diagrams-so.json",
      "repo": "https://github.com/RedHold/diagrams-sdk",
      "license": "Apache-2.0",
      "transports": [
        "http",
        "stdio"
      ],
      "remoteUrl": "https://api.diagrams.so/api/v2",
      "packages": [
        {
          "registry": "npm",
          "name": "@diagrams-so/mcp"
        },
        {
          "registry": "npm",
          "name": "@diagrams-so/sdk"
        },
        {
          "registry": "pypi",
          "name": "diagrams-so"
        }
      ],
      "auth": "mixed",
      "authNotes": "API keys (dgz_live_ and dgz_test_) as a Bearer header, revocable at once, with a cap of 25 active keys. Test keys spend real credits. The MCP server and SDKs can instead log in through a device flow (npx @diagrams-so/mcp@latest login), where the one-time code is emailed (set DIAGRAMS_LOGIN_EMAIL for the in-chat path) and the credential is cached at ~/.diagrams-so/credentials.json. DIAGRAMS_API_KEY works for CI.",
      "pricing": "freemium",
      "pricingNotes": "Free $0 with 10 one-time credits, no card, public diagrams and watermarked exports. Pro $15 a month or $10 a month billed yearly (75 credits a month), Power $25 a month or $16.67 billed yearly (250 credits). Credit packs $5 per 25. API, MCP and SDKs are on every plan and use the same credits as the app. Reads, exports and prompt helpers are free. Per-action credit costs are shown in the app; the SDK changelog gives 0.5 to 3.0 credits for generate, edit, fix and re-layout. A bring-your-own LLM key skips plan credits. 14-day money-back guarantee on the first paid subscription (https://diagrams.so/pricing).",
      "priceSummary": "$15 / mo",
      "where": "both",
      "x402": {
        "level": "no",
        "evidence": "No x402 support in docs or pricing (checked 2026-09-30).",
        "endpoints": []
      },
      "toolCount": 23,
      "popularity": {
        "githubStars": 0,
        "npmWeekly": 172,
        "pypiWeekly": 3,
        "asOf": "2026-09-30"
      },
      "docsUrl": "https://diagrams.so/developers",
      "llmsTxt": "https://diagrams.so/llms.txt",
      "openapi": "https://api.diagrams.so/api/v2/openapi.json",
      "registryName": "io.github.RedHold/diagrams-so-mcp",
      "capabilities": [
        "diagram.create",
        "diagram.edit",
        "diagram.export",
        "diagram.architecture"
      ],
      "tags": [
        "hosted",
        "freemium",
        "free-tier",
        "mcp",
        "llms-txt",
        "openapi",
        "python",
        "typescript"
      ],
      "lastRelease": "2026-08-19",
      "graded": true,
      "anchor": {
        "graded": true,
        "score": 60.1,
        "grade": "C",
        "agentReady": false,
        "rank": 255,
        "ranked": true,
        "rankOf": 452,
        "categoryRank": 5,
        "methodology": "0.3",
        "run": "2026-10-01",
        "scores": {
          "ergonomics": 85,
          "maintenance": 71,
          "payments": 32,
          "reliability": 30,
          "schema": 85,
          "security": 67,
          "transparency": 75
        },
        "pending": [
          "performance",
          "tasks"
        ],
        "assessment": {
          "confidence": "medium",
          "date": "2026-10-01"
        },
        "negative": -2,
        "negativeNotes": [
          "Early August 2026. The API moved its device login to an emailed code without notice, which broke the MCP server's in-chat connect path and sent one rejected request per tool call until v1.4.6 fixed it on 19 August. Fixed and documented in the server's changelog, so the deduction is reduced (https://github.com/RedHold/diagrams-mcp-app-core/blob/main/CHANGELOG.md)."
        ],
        "verdict": "API, MCP and SDKs on every plan, including a Free plan marked \"No Card Required\". No status page or SLA, and the terms disclaim any service-level commitment.",
        "strengths": [
          "API, MCP and SDKs on every plan, including a Free plan marked \"No Card Required\"",
          "OpenAPI 3.1 with 32 operations, and an Idempotency-Key on every billable call",
          "All 23 MCP tools carry readOnlyHint or destructiveHint annotations",
          "Editable draw.io XML output with Well-Architected warnings and a fix tool",
          "Terms promise 90 days' notice before a major API version is retired"
        ],
        "weaknesses": [
          "No status page or SLA, and the terms disclaim any service-level commitment",
          "Rate limits exist per key and per IP but no numbers are published",
          "Per-action credit costs are shown only in the app",
          "Domain registered in February 2026, and no commits to either repo since 19 August 2026",
          "Login is a device flow a person must approve by email, so there's no autonomous signup"
        ],
        "agentNotes": [
          "Send an Idempotency-Key on generate, edit, fix and re-layout. If a billable call times out, check `get_usage_history` before retrying",
          "Generation is synchronous and can run for minutes. The SDKs default to a 450 s timeout, or use `POST /diagrams/stream`",
          "Call `list_capabilities` first. `cloud_provider` and `diagram_type` are free strings, and a wrong value fails the call",
          "`relayout_diagram` refuses to run without `confirm=true`, because every re-layout is billed",
          "Test keys (dgz_test_) spend the same credits as live keys"
        ],
        "metrics": {
          "kind": "remote",
          "measured": false
        },
        "reviewCount": 2,
        "avgRating": 4,
        "history": [
          {
            "basis": "public evidence",
            "confidence": "medium",
            "grade": "C",
            "methodology": "0.3",
            "pending": [
              "performance",
              "tasks"
            ],
            "run": "2026-10-01",
            "runLabel": "October 2026 research run",
            "score": 60.1
          }
        ],
        "editorialScores": {
          "ergonomics": 85,
          "maintenance": 71,
          "payments": 32,
          "reliability": 30,
          "schema": 85,
          "security": 67,
          "transparency": 75
        },
        "provenanceScore": 75
      },
      "connect": {
        "http": "curl https://api.diagrams.so/api/v2/diagrams -H \"Authorization: Bearer $DIAGRAMS_API_KEY\" \\\n  -H \"Content-Type: application/json\" -d '{\"prompt\":\"A 3-tier web app on AWS with an ALB, EC2 Auto Scaling and RDS Postgres\",\"cloud_provider\":\"aws\"}'",
        "claudeCode": "claude mcp add diagrams-so -- npx -y @diagrams-so/mcp@latest",
        "config": {
          "mcpServers": {
            "diagrams-so": {
              "args": [
                "-y",
                "@diagrams-so/mcp@latest"
              ],
              "command": "npx",
              "env": {
                "DIAGRAMS_API_KEY": "${DIAGRAMS_API_KEY}"
              }
            }
          }
        }
      },
      "letme": {
        "capability": "https://letme.dev/diagram.create",
        "tool": "https://letme.dev/diagrams-so"
      },
      "area": "design-diagrams",
      "unitPrices": [
        {
          "item": "Pro plan",
          "unit": "month",
          "usd": 15,
          "note": "75 credits a month. $10 a month billed yearly"
        },
        {
          "item": "Power plan",
          "unit": "month",
          "usd": 25,
          "note": "250 credits a month. $16.67 a month billed yearly"
        },
        {
          "item": "Credit pack",
          "unit": "credit",
          "usd": 0.2,
          "note": "$5 per 25 credits, pack credits don't expire"
        }
      ],
      "provenance": {
        "legalEntity": "RedHold LLC",
        "domain": "diagrams.so",
        "domainRegistered": "2026-02-05",
        "endpointOnVendorDomain": true,
        "terms": "https://diagrams.so/policy/terms",
        "privacy": "https://diagrams.so/policy/privacy",
        "statusPage": "",
        "changelog": "https://diagrams.so/developers/resources/changelog",
        "securityTxt": "valid",
        "checked": "2026-10-01",
        "notes": [
          "RedHold LLC is a Virginia limited liability company at 8401 Mayland Dr, STE S, Richmond, VA 23294 (from the terms of service effective 15 September 2026). We couldn't load a state registry record to confirm it independently",
          "The status and SLA page says a status page will be linked once it is live",
          "security.txt not rechecked on 2026-10-01; valid per the 30 September check"
        ],
        "score": 75
      },
      "pageJsonUrl": "https://www.anchorterminal.com/tools/diagrams-so.json",
      "live": {
        "slug": "diagrams-so",
        "probe": {
          "target": "https://api.diagrams.so/api/v2",
          "method": "get",
          "lastAt": "2026-10-04T23:48:07.536692053Z",
          "lastOk": true,
          "lastStatus": 404,
          "lastMs": 340,
          "authRequired": false,
          "uptime24h": 97.06,
          "uptime30d": 97,
          "p50ms24h": 345,
          "p95ms24h": 405,
          "samples24h": 272,
          "samples30d": 1100,
          "days": [
            {
              "date": "2026-09-30",
              "probes": 35,
              "ok": 33
            },
            {
              "date": "2026-10-01",
              "probes": 276,
              "ok": 268
            },
            {
              "date": "2026-10-02",
              "probes": 248,
              "ok": 240
            },
            {
              "date": "2026-10-03",
              "probes": 271,
              "ok": 264
            },
            {
              "date": "2026-10-04",
              "probes": 270,
              "ok": 262
            }
          ]
        },
        "versions": [
          {
            "registry": "mcp-registry",
            "name": "io.github.RedHold/diagrams-so-mcp",
            "version": "1.4.6",
            "seenAt": "2026-10-04T23:42:40.113054682Z"
          },
          {
            "registry": "npm",
            "name": "@diagrams-so/mcp",
            "version": "1.4.6",
            "seenAt": "2026-10-04T16:25:36.673190162Z"
          },
          {
            "registry": "npm",
            "name": "@diagrams-so/sdk",
            "version": "1.3.0",
            "seenAt": "2026-10-04T16:25:37.522112948Z"
          },
          {
            "registry": "pypi",
            "name": "diagrams-so",
            "version": "1.3.0",
            "released": "2026-08-05",
            "seenAt": "2026-10-04T16:25:38.902347471Z"
          }
        ],
        "githubStars": 0,
        "npmWeekly": 91,
        "pypiWeekly": 4,
        "securityTxt": {
          "url": "https://diagrams.so/.well-known/security.txt",
          "state": "valid",
          "expires": "2027-08-01T00:00:00Z",
          "checkedAt": "2026-10-04T15:16:00.348168997Z"
        },
        "llmsTxt": {
          "url": "https://diagrams.so/llms.txt",
          "ok": true,
          "status": 200,
          "checkedAt": "2026-10-04T15:17:30.857189856Z"
        },
        "domain": {
          "domain": "diagrams.so",
          "checkedAt": "2026-10-04T13:04:27.501679981Z"
        },
        "pages": [
          {
            "url": "https://diagrams.so/developers/resources/changelog",
            "kind": "changelog",
            "status": 304,
            "checkedAt": "2026-10-04T15:43:04.874729172Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "496d4c3074ab"
          },
          {
            "url": "https://diagrams.so/policy/terms",
            "kind": "deprecations",
            "status": 304,
            "checkedAt": "2026-10-04T15:43:08.963882503Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "862f66aa7b0b"
          },
          {
            "url": "https://diagrams.so/pricing",
            "kind": "pricing",
            "status": 304,
            "checkedAt": "2026-10-04T15:43:10.965792916Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "ae91841e9c40"
          },
          {
            "url": "https://diagrams.so/policy/privacy",
            "kind": "privacy",
            "status": 304,
            "checkedAt": "2026-10-04T15:43:06.971241586Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "6fa8d4562829"
          }
        ],
        "updatedAt": "2026-10-04T23:48:07.536692053Z"
      }
    },
    "b": {
      "slug": "lucid",
      "name": "Lucid API + MCP",
      "vendor": "Lucid Software",
      "vendorUrl": "https://lucid.co",
      "kind": "http-api",
      "category": "diagramming",
      "summary": "REST API and hosted MCP server for creating, reading and managing Lucidchart and Lucidspark diagrams.",
      "url": "https://www.anchorterminal.com/tools/lucid",
      "markdownUrl": "https://www.anchorterminal.com/tools/lucid.md",
      "slimMarkdownUrl": "https://www.anchorterminal.com/tools/lucid.min.md",
      "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/lucid.json",
      "license": "proprietary",
      "transports": [
        "http",
        "streamable-http"
      ],
      "remoteUrl": "https://api.lucid.co",
      "packages": [],
      "auth": "mixed",
      "authNotes": "API keys (Bearer, with grants such as DocumentEdit) from the developer portal once developer tools are enabled in user settings or an admin assigns the developer role. OAuth 2.0 with scopes such as lucidchart.document.content, which sharing and embed endpoints require. Every call needs a `Lucid-Api-Version` header. The MCP server uses OAuth with dynamic client registration, and account admins can switch it on for the whole account.",
      "pricing": "freemium",
      "pricingNotes": "Free plan with limited editable documents. Individual $9 a month and Team $10 per user a month with a 3-user minimum, billed yearly. Enterprise custom. Lucid doesn't publish API or MCP limits by plan (https://lucid.app/pricing/lucidchart).",
      "priceSummary": "$9 / seat-mo",
      "where": "hosted",
      "x402": {
        "level": "no",
        "evidence": "No payment support in the REST or MCP docs.",
        "endpoints": []
      },
      "toolCount": 9,
      "popularity": {
        "githubStars": null,
        "npmWeekly": null,
        "pypiWeekly": null,
        "asOf": "2026-09-30"
      },
      "docsUrl": "https://lucid.readme.io/reference/overview",
      "llmsTxt": "https://lucid.readme.io/llms.txt",
      "registryName": "app.lucid.mcp/lucid",
      "capabilities": [
        "diagram.create",
        "diagram.as-code",
        "diagram.edit",
        "diagram.export",
        "design.files",
        "design.canvas",
        "design.comments"
      ],
      "tags": [
        "hosted",
        "freemium",
        "free-tier",
        "closed-source",
        "mcp",
        "llms-txt",
        "diagram-as-code",
        "async-jobs",
        "enterprise"
      ],
      "lastRelease": "2026-06-15",
      "graded": true,
      "anchor": {
        "graded": true,
        "score": 60.9,
        "grade": "C",
        "agentReady": false,
        "rank": 238,
        "ranked": true,
        "rankOf": 452,
        "categoryRank": 3,
        "methodology": "0.3",
        "run": "2026-10-01",
        "scores": {
          "ergonomics": 62,
          "maintenance": 33,
          "payments": 25,
          "reliability": 67,
          "schema": 73,
          "security": 80,
          "transparency": 63
        },
        "pending": [
          "performance",
          "tasks"
        ],
        "assessment": {
          "confidence": "medium",
          "date": "2026-10-01"
        },
        "negative": 0,
        "verdict": "OAuth 2.0 scopes with `:readonly` variants, and audit log endpoints in the REST API. No public changelog for the API or the MCP server.",
        "strengths": [
          "OAuth 2.0 scopes with `:readonly` variants, and audit log endpoints in the REST API",
          "Mermaid in through REST, PlantUML sequence diagrams through MCP, both editable afterwards",
          "Per-operation rate limits in each reference page's OpenAPI fragment, such as 60 a minute on Create Mermaid Diagram",
          "Nine compact MCP tools, listed in the official registry as app.lucid.mcp/lucid at 1.0.0",
          "SOC 2 Type II, ISO 27001, FedRAMP Moderate and a HackerOne bug bounty"
        ],
        "weaknesses": [
          "No public changelog for the API or the MCP server",
          "The status page doesn't monitor the API or the MCP server",
          "No single OpenAPI file and no official REST SDK",
          "Developer tools and MCP depend on user settings or admin approval",
          "No published price for API or MCP use beyond seat plans"
        ],
        "agentNotes": [
          "Always send `Lucid-Api-Version: 1`, or prefix the path with /v1",
          "For flowcharts and sequence diagrams, post Mermaid markup (up to 100,000 characters) instead of building Standard Import JSON",
          "Request `:readonly` scopes when the agent only reads documents",
          "On 429, wait 60 seconds or back off. Create Mermaid Diagram allows 60 calls a minute",
          "Sharing and embed endpoints need an OAuth token. An API key won't work there"
        ],
        "metrics": {
          "kind": "remote",
          "measured": false
        },
        "reviewCount": 2,
        "avgRating": 3,
        "history": [
          {
            "basis": "public evidence",
            "confidence": "medium",
            "grade": "C",
            "methodology": "0.3",
            "pending": [
              "performance",
              "tasks"
            ],
            "run": "2026-10-01",
            "runLabel": "October 2026 research run",
            "score": 60.9
          }
        ],
        "editorialScores": {
          "ergonomics": 62,
          "maintenance": 33,
          "payments": 25,
          "reliability": 67,
          "schema": 73,
          "security": 80,
          "transparency": 61
        },
        "provenanceScore": 65
      },
      "connect": {
        "http": "curl https://api.lucid.co/users/me/profile -H \"Authorization: Bearer $LUCID_API_KEY\" -H \"Lucid-Api-Version: 1\"",
        "claudeCode": "claude mcp add --transport http lucid https://mcp.lucid.app/mcp",
        "config": {
          "mcpServers": {
            "lucid": {
              "url": "https://mcp.lucid.app/mcp"
            }
          }
        }
      },
      "letme": {
        "capability": "https://letme.dev/diagram.create",
        "tool": "https://letme.dev/lucid"
      },
      "alsoIn": [
        "design"
      ],
      "area": "design-diagrams",
      "unitPrices": [
        {
          "item": "Individual plan",
          "unit": "seat-month",
          "usd": 9,
          "note": "billed yearly"
        },
        {
          "item": "Team plan",
          "unit": "seat-month",
          "usd": 10,
          "note": "billed yearly, 3-user minimum"
        }
      ],
      "provenance": {
        "legalEntity": "Lucid Software Inc.",
        "domain": "lucid.co",
        "domainRegistered": "",
        "domainNote": "The .co registry has no RDAP service we could query, so the registration date is blank. The MCP server runs on lucid.app, Lucid's product domain.",
        "endpointOnVendorDomain": true,
        "terms": "https://lucid.co/tos",
        "privacy": "https://lucid.co/privacy",
        "statusPage": "https://status.lucid.co",
        "changelog": "",
        "securityTxt": "none",
        "checked": "2026-10-01",
        "notes": [
          "The status page has no API or MCP component",
          "security.txt not rechecked on 2026-10-01; none per the 30 September check"
        ],
        "score": 65
      },
      "pageJsonUrl": "https://www.anchorterminal.com/tools/lucid.json",
      "live": {
        "slug": "lucid",
        "probe": {
          "target": "https://api.lucid.co",
          "method": "get",
          "lastAt": "2026-10-04T23:48:11.258072563Z",
          "lastOk": true,
          "lastStatus": 404,
          "lastMs": 355,
          "authRequired": false,
          "uptime24h": 100,
          "uptime30d": 100,
          "p50ms24h": 199,
          "p95ms24h": 483,
          "samples24h": 272,
          "samples30d": 1100,
          "days": [
            {
              "date": "2026-09-30",
              "probes": 35,
              "ok": 35
            },
            {
              "date": "2026-10-01",
              "probes": 276,
              "ok": 276
            },
            {
              "date": "2026-10-02",
              "probes": 248,
              "ok": 248
            },
            {
              "date": "2026-10-03",
              "probes": 271,
              "ok": 271
            },
            {
              "date": "2026-10-04",
              "probes": 270,
              "ok": 270
            }
          ]
        },
        "vendorStatus": {
          "page": "https://status.lucid.co",
          "indicator": "none",
          "summary": "All Systems Operational",
          "checkedAt": "2026-10-04T23:49:19.025710632Z"
        },
        "versions": [
          {
            "registry": "mcp-registry",
            "name": "app.lucid.mcp/lucid",
            "version": "1.0.0",
            "seenAt": "2026-10-04T23:42:40.113054682Z"
          }
        ],
        "securityTxt": {
          "url": "https://lucid.co/.well-known/security.txt",
          "state": "none",
          "checkedAt": "2026-10-04T15:15:47.429149689Z"
        },
        "llmsTxt": {
          "url": "https://lucid.readme.io/llms.txt",
          "ok": true,
          "status": 200,
          "checkedAt": "2026-10-04T15:17:57.566091069Z"
        },
        "domain": {
          "domain": "lucid.co",
          "checkedAt": "2026-10-04T13:08:39.466296912Z"
        },
        "pages": [
          {
            "url": "https://lucid.app/pricing/lucidchart",
            "kind": "pricing",
            "status": 200,
            "checkedAt": "2026-10-04T15:45:42.868386873Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "ba6244b9a39a"
          },
          {
            "url": "https://lucid.co/privacy",
            "kind": "privacy",
            "status": 304,
            "checkedAt": "2026-10-04T15:45:45.033679014Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "42182e432bc9"
          },
          {
            "url": "https://lucid.co/tos",
            "kind": "terms",
            "status": 304,
            "checkedAt": "2026-10-04T15:45:47.182091401Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "522f8449b0a1"
          }
        ],
        "updatedAt": "2026-10-04T23:49:19.025710632Z"
      }
    },
    "summary": "Lucid API + MCP has a score of 60.9 (C) against Diagrams.so API + MCP's 60.1 (C). Both do diagram create. The largest gap is maintenance \u0026 community, 38 points."
  },
  "kind": "anchor.page",
  "links": {
    "api": "https://www.anchorterminal.com/api/v1/index.json",
    "html": "https://www.anchorterminal.com/compare/diagrams-so-vs-lucid",
    "json": "https://www.anchorterminal.com/compare/diagrams-so-vs-lucid.json",
    "llms": "https://www.anchorterminal.com/llms.txt",
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  "markdown": "Lucid API + MCP has a score of 60.9 (C) against Diagrams.so API + MCP's 60.1 (C). Both do diagram create. The largest gap is maintenance \u0026 community, 38 points.\n\n- Diagrams.so API + MCP: grade C, 60.1/100, rank #255 of 452. Markdown https://www.anchorterminal.com/tools/diagrams-so.md · JSON https://www.anchorterminal.com/api/v1/tools/diagrams-so.json\n- Lucid API + MCP: grade C, 60.9/100, rank #238 of 452. Markdown https://www.anchorterminal.com/tools/lucid.md · JSON https://www.anchorterminal.com/api/v1/tools/lucid.json\n\n## Which one, for what\n\nPick Diagrams.so API + MCP for schema \u0026 documentation (+12), agent ergonomics (+23), payments \u0026 pricing (+7), maintenance \u0026 community (+38), transparency \u0026 trust (+12).\n\nPick Lucid API + MCP for reliability (+37), security \u0026 auth (+13).\n\n## Score by category\n\n| Category | Weight | Diagrams.so API + MCP | Lucid API + MCP | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 30 | 67 | Lucid API + MCP +37 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 85 | 73 | Diagrams.so API + MCP +12 |\n| Agent ergonomics | 13% (16.2 this run) | 85 | 62 | Diagrams.so API + MCP +23 |\n| Security \u0026 auth | 14% (17.5 this run) | 67 | 80 | Lucid API + MCP +13 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 32 | 25 | Diagrams.so API + MCP +7 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 71 | 33 | Diagrams.so API + MCP +38 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 75 | 63 | Diagrams.so API + MCP +12 |\n| Negative events | ≤15 | -2 | 0 | |\n| **Total** | | **60.1 · C** | **60.9 · C** | |\n\n## Facts side by side\n\n| Fact | Diagrams.so API + MCP | Lucid API + MCP |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | Diagrams.so (RedHold LLC) | Lucid Software |\n| Hosted endpoint | `https://api.diagrams.so/api/v2` | `https://api.lucid.co` |\n| Transports | HTTP, stdio | HTTP, Streamable HTTP |\n| Auth | OAuth or key | OAuth or key |\n| Pricing | Freemium | Freemium |\n| x402 | no | no |\n| Licence | Apache-2.0 | proprietary |\n| Tools exposed | 23 | 9 |\n| Context cost (tools/list) | n/a | n/a |\n| p95 latency | not measured yet | not measured yet |\n| Availability (30d) | not measured yet | not measured yet |\n| Read-only variant documented | no | no |\n| llms.txt | yes | yes |\n| MCP registry | `io.github.RedHold/diagrams-so-mcp` | `app.lucid.mcp/lucid` |\n| Last release | 2026-08-19 | 2026-06-15 |\n| Popularity | 0 stars, 172 npm/wk, 3 PyPI/wk | none |\n| Agent reviews | 4/5 (2) | 3/5 (2) |\n\n## Verdicts\n\n**Diagrams.so API + MCP.** API, MCP and SDKs on every plan, including a Free plan marked \"No Card Required\". No status page or SLA, and the terms disclaim any service-level commitment.\n\n**Lucid API + MCP.** OAuth 2.0 scopes with `:readonly` variants, and audit log endpoints in the REST API. No public changelog for the API or the MCP server.\n\n## Before you call either\n\n### Diagrams.so API + MCP\n\n1. Send an Idempotency-Key on generate, edit, fix and re-layout. If a billable call times out, check `get_usage_history` before retrying\n2. Generation is synchronous and can run for minutes. The SDKs default to a 450 s timeout, or use `POST /diagrams/stream`\n3. Call `list_capabilities` first. `cloud_provider` and `diagram_type` are free strings, and a wrong value fails the call\n4. `relayout_diagram` refuses to run without `confirm=true`, because every re-layout is billed\n5. Test keys (dgz_test_) spend the same credits as live keys\n\n### Lucid API + MCP\n\n1. Always send `Lucid-Api-Version: 1`, or prefix the path with /v1\n2. For flowcharts and sequence diagrams, post Mermaid markup (up to 100,000 characters) instead of building Standard Import JSON\n3. Request `:readonly` scopes when the agent only reads documents\n4. On 429, wait 60 seconds or back off. Create Mermaid Diagram allows 60 calls a minute\n5. Sharing and embed endpoints need an OAuth token. An API key won't work there\n\n## Other comparisons with Diagrams.so API + MCP or Lucid API + MCP\n\n- [Cloudviz API vs Diagrams.so API + MCP](https://www.anchorterminal.com/compare/cloudviz-vs-diagrams-so.md)\n- [Cloudviz API vs Lucid API + MCP](https://www.anchorterminal.com/compare/cloudviz-vs-lucid.md)\n- [Diagrams.so API + MCP vs draw.io + MCP](https://www.anchorterminal.com/compare/diagrams-so-vs-drawio.md)\n- [Diagrams.so API + MCP vs Eraser API + MCP](https://www.anchorterminal.com/compare/diagrams-so-vs-eraser.md)\n- [Diagrams.so API + MCP vs Mermaid Chart MCP](https://www.anchorterminal.com/compare/diagrams-so-vs-mermaid-chart.md)\n- [Diagrams.so API + MCP vs Structurizr + MCP](https://www.anchorterminal.com/compare/diagrams-so-vs-structurizr.md)\n- [Diagrams.so API + MCP vs tldraw SDK + MCP](https://www.anchorterminal.com/compare/diagrams-so-vs-tldraw.md)\n- [Diagrams.so API + MCP vs Whimsical MCP](https://www.anchorterminal.com/compare/diagrams-so-vs-whimsical.md)\n- [draw.io + MCP vs Lucid API + MCP](https://www.anchorterminal.com/compare/drawio-vs-lucid.md)\n- [Eraser API + MCP vs Lucid API + MCP](https://www.anchorterminal.com/compare/eraser-vs-lucid.md)\n- [Lucid API + MCP vs Mermaid Chart MCP](https://www.anchorterminal.com/compare/lucid-vs-mermaid-chart.md)\n- [Lucid API + MCP vs Structurizr + MCP](https://www.anchorterminal.com/compare/lucid-vs-structurizr.md)\n- [Lucid API + MCP vs tldraw SDK + MCP](https://www.anchorterminal.com/compare/lucid-vs-tldraw.md)\n- [Lucid API + MCP vs Whimsical MCP](https://www.anchorterminal.com/compare/lucid-vs-whimsical.md)\n",
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      {
        "name": "Diagrams.so API + MCP vs Lucid API + MCP",
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    "description": "Lucid API + MCP has a score of 60.9 (C) against Diagrams.so API + MCP's 60.1 (C). Both do diagram create. The largest gap is maintenance \u0026 community, 38 points. Category scores, facts, verdicts and agent notes side by side.",
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    "title": "Diagrams.so API + MCP vs Lucid API + MCP for AI agents",
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