{
  "data": {
    "a": {
      "slug": "excalidraw",
      "name": "Excalidraw",
      "vendor": "Excalidraw s.r.o.",
      "vendorUrl": "https://plus.excalidraw.com",
      "kind": "http-api",
      "category": "diagramming",
      "summary": "Excalidraw is a hand-drawn style whiteboard and diagram editor from Excalidraw s.r.o. in Brno. Agents reach it through the Excalidraw+ REST API and MCP server (public beta), a free keyless MCP App, and the open-source editor on npm (MIT).",
      "url": "https://www.anchorterminal.com/tools/excalidraw",
      "markdownUrl": "https://www.anchorterminal.com/tools/excalidraw.md",
      "slimMarkdownUrl": "https://www.anchorterminal.com/tools/excalidraw.min.md",
      "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/excalidraw.json",
      "repo": "https://github.com/excalidraw/excalidraw",
      "license": "Excalidraw+ is a proprietary service under Excalidraw's terms of use. The editor and the MCP App on GitHub are MIT",
      "transports": [
        "http",
        "streamable-http"
      ],
      "remoteUrl": "https://api.excalidraw.com/api/v1/mcp",
      "packages": [
        {
          "registry": "npm",
          "name": "@excalidraw/excalidraw"
        }
      ],
      "auth": "api-key",
      "authNotes": "A person creates an API key in Excalidraw+ workspace settings, and the full key is shown once. Keys are sent as `Authorization: Bearer \u003cAPI_KEY\u003e`, belong to one workspace, take `read` or `full` permission or specific routes, and expire on a set date. Personal keys act as one member and need a workspace admin to enable them. Workspace keys act as the workspace. The free MCP App at https://mcp.excalidraw.com takes no credential.",
      "pricing": "freemium",
      "pricingNotes": "API and MCP access is listed under the Plus plan at $6 a user a month, 14 per cent less billed yearly, with a 14-day trial. The page does not say whether the trial takes a card. The Free plan, the free MCP App and the npm editor cost nothing, so an agent can draw without a contract but cannot reach a workspace (checked 2026-10-09).",
      "priceSummary": "$6 / seat-mo",
      "where": "hosted",
      "x402": {
        "level": "no",
        "evidence": "No x402, MPP or L402 in the docs dump, the pricing page or the MCP App source (checked 2026-10-09).",
        "endpoints": []
      },
      "toolCount": 37,
      "popularity": {
        "githubStars": 133534,
        "npmWeekly": 675606,
        "pypiWeekly": null,
        "asOf": "2026-10-09"
      },
      "docsUrl": "https://plus.excalidraw.com/docs",
      "llmsTxt": "https://plus.excalidraw.com/llms.txt",
      "capabilities": [
        "diagram.create",
        "diagram.edit",
        "diagram.export",
        "diagram.as-code"
      ],
      "tags": [
        "hosted",
        "mcp",
        "api-key",
        "llms-txt",
        "freemium",
        "beta",
        "status-page",
        "soc2",
        "open-source",
        "typescript",
        "eu"
      ],
      "lastRelease": "2026-09-01",
      "graded": true,
      "anchor": {
        "graded": true,
        "score": 54.5,
        "grade": "C",
        "agentReady": false,
        "rank": 683,
        "ranked": true,
        "rankOf": 950,
        "categoryRank": 9,
        "methodology": "0.4",
        "run": "2026-10-01",
        "scores": {
          "ergonomics": 58,
          "maintenance": 44,
          "payments": 35,
          "reliability": 50,
          "schema": 65,
          "security": 73,
          "transparency": 63
        },
        "pending": [
          "performance",
          "tasks"
        ],
        "assessment": {
          "confidence": "medium",
          "date": "2026-10-09"
        },
        "negative": -2,
        "negativeNotes": [
          "Checked 2026-10-09. GHSA-39h7-pwv7-rc3x (CVE-2025-54881, medium), cross-site scripting in the Mermaid to Excalidraw conversion step, was published on 21 April 2026 and fixed in `@excalidraw/excalidraw` 0.18.1 and `@excalidraw/mermaid-to-excalidraw` 1.1.3. Fixed and published, so 2 points (https://github.com/excalidraw/excalidraw/security/advisories/GHSA-39h7-pwv7-rc3x)."
        ],
        "verdict": "Excalidraw+ keys carry read or full permission, route restrictions and an expiry, and the MCP server shows a key only the tools its routes allow. The API and MCP server are in public beta with breaking changes expected, sit behind the $6 Plus plan, and have no published OpenAPI file, SDK or idempotency keys.",
        "bestFor": "Teams already on Excalidraw+ that want agents to create and edit hand-drawn diagrams, slides and wireframes in a shared workspace, and one-off sketches through the free MCP App.",
        "strengths": [
          "API keys take `read` or `full` permission, route restrictions and an expiry, and can be rotated. The MCP server lists only the tools a key's routes allow",
          "`create_diagram` lays out nodes, edges and groups into editable shapes with bound arrows, and `take_screenshot` returns a PNG to check the result",
          "`search_scene_content` returns only matching elements, so an agent need not load a whole scene",
          "`llms.txt` and a 110 KB `llms-full.txt` carry the API and MCP docs, and `GET /logs` returns the workspace audit log",
          "A free MCP App at https://mcp.excalidraw.com needs no account or key, and the editor is MIT on npm with 675,606 downloads in the week to 7 October 2026"
        ],
        "weaknesses": [
          "The API and MCP server are in public beta. The docs say endpoints, tool names and schemas may change and to expect breaking changes",
          "API and MCP access needs the Plus plan at $6 a user a month. No per-call price, and no SDK for the API",
          "No OpenAPI file is linked from the docs, although the reference pages are generated from one. No idempotency keys and no SLA found",
          "The terms of use (in effect 1 June 2022) forbid access through a bot or script and do not mention the API. This matters before any probe is run",
          "The privacy policy is dated 29 April 2021 and names no AI providers. The sub-processor list sits in a script-drawn trust centre",
          "In the free MCP App, `create_view` is marked read-only yet stores a checkpoint for 30 days, and its reply names a `read_widget_context` tool the server does not register"
        ],
        "agentNotes": [
          "Send `Authorization: Bearer \u003cAPI_KEY\u003e` to https://api.excalidraw.com/api/v1. For MCP, use `POST /api/v1/mcp` only. The server is stateless and answers 405 to other methods",
          "Use a personal key to reach the owner's private collection with the collection ID `private`. A workspace admin must enable personal keys first",
          "Call `read_diagram_format`, `read_presentation_format` or `read_freeform_format` before the first scene write in a session",
          "Write with `edit_scene_content` and bind arrows through `startBinding` and `endBinding` with `tempId` references. `PUT /scenes/{sceneId}/content` removes every element left out of the request",
          "Stay under 600 requests a minute per IP and wait until `X-RateLimit-Reset` after a 429"
        ],
        "metrics": {
          "kind": "remote",
          "measured": false
        },
        "reviewCount": 0,
        "avgRating": 0,
        "history": [
          {
            "basis": "public evidence",
            "confidence": "medium",
            "grade": "C",
            "methodology": "0.4",
            "pending": [
              "performance",
              "tasks"
            ],
            "run": "2026-10-01",
            "runLabel": "October 2026 research run",
            "score": 54.5
          }
        ],
        "editorialScores": {
          "ergonomics": 58,
          "maintenance": 44,
          "payments": 35,
          "reliability": 50,
          "schema": 65,
          "security": 73,
          "transparency": 45
        },
        "provenanceScore": 80
      },
      "connect": {
        "install": "npm install react react-dom @excalidraw/excalidraw",
        "http": "curl https://api.excalidraw.com/api/v1/collections \\\n  -H \"Authorization: Bearer \u003cAPI_KEY\u003e\"",
        "config": {
          "mcpServers": {
            "excalidraw": {
              "headers": {
                "Authorization": "Bearer \u003cAPI_KEY\u003e"
              },
              "type": "http",
              "url": "https://api.excalidraw.com/api/v1/mcp"
            }
          }
        }
      },
      "letme": {
        "capability": "https://letme.dev/diagram.create",
        "tool": "https://letme.dev/excalidraw"
      },
      "area": "design-diagrams",
      "unitPrices": [
        {
          "item": "Plus plan",
          "unit": "seat-month",
          "usd": 6,
          "note": "billed monthly, 14 per cent less billed yearly. API and MCP access, 100 AI requests a day"
        }
      ],
      "provenance": {
        "legalEntity": "Excalidraw s.r.o.",
        "domain": "excalidraw.com",
        "domainRegistered": "2020-01-03",
        "endpointOnVendorDomain": true,
        "terms": "https://plus.excalidraw.com/terms-of-service",
        "privacy": "https://plus.excalidraw.com/privacy-policy",
        "statusPage": "https://status.excalidraw.com",
        "changelog": "https://plus.excalidraw.com/changelog",
        "securityTxt": "none",
        "checked": "2026-10-09",
        "notes": [
          "The terms of use and the privacy policy name Excalidraw s.r.o., Pražákova 1008/69, Brno 639 00, Czech Republic. The terms are governed by Czech law.",
          "The terms of use (published 30 May 2022) are the only terms found. They cover the Site and the subscription and do not mention the API or MCP server.",
          "The privacy policy is dated 29 April 2021. A DPA dated 13 January 2026 is at https://plus.excalidraw.com/data-processing-agreement-dpa.",
          "plus.excalidraw.com/.well-known/security.txt returns 404. excalidraw.com was not asked, because its robots.txt is ambiguous for unnamed agents.",
          "RDAP for excalidraw.com gives a registration date of 2020-01-03.",
          "The robots.txt files of api.excalidraw.com and status.excalidraw.com disallow every path."
        ],
        "score": 80
      },
      "pageJsonUrl": "https://www.anchorterminal.com/tools/excalidraw.json",
      "live": {
        "slug": "excalidraw",
        "probe": {
          "target": "https://api.excalidraw.com/api/v1/mcp",
          "method": "get",
          "lastAt": "2026-10-10T03:53:26.942763537Z",
          "lastOk": true,
          "lastStatus": 405,
          "lastMs": 336,
          "authRequired": false,
          "uptime24h": 100,
          "uptime30d": 100,
          "p50ms24h": 336,
          "p95ms24h": 400,
          "samples24h": 125,
          "samples30d": 125,
          "days": [
            {
              "date": "2026-10-09",
              "probes": 85,
              "ok": 85
            },
            {
              "date": "2026-10-10",
              "probes": 40,
              "ok": 40
            }
          ]
        },
        "vendorStatus": {
          "page": "https://status.excalidraw.com",
          "indicator": "unknown",
          "summary": "no machine-readable status found",
          "checkedAt": "2026-10-10T00:50:32.425887728Z"
        },
        "versions": [
          {
            "registry": "github",
            "name": "excalidraw/excalidraw",
            "version": "v0.18.1",
            "released": "2026-04-21",
            "seenAt": "2026-10-09T16:52:20.443420866Z"
          },
          {
            "registry": "npm",
            "name": "@excalidraw/excalidraw",
            "version": "0.18.1",
            "seenAt": "2026-10-09T16:52:19.575748854Z"
          }
        ],
        "githubStars": 133551,
        "npmWeekly": 675606,
        "pages": [
          {
            "url": "https://plus.excalidraw.com/changelog",
            "kind": "changelog",
            "status": 200,
            "checkedAt": "2026-10-09T18:43:35.623690787Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "7a9250424db5"
          },
          {
            "url": "https://plus.excalidraw.com/privacy-policy",
            "kind": "privacy",
            "status": 200,
            "checkedAt": "2026-10-09T18:43:37.662006429Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "8328a24b3944"
          },
          {
            "url": "https://plus.excalidraw.com/terms-of-service",
            "kind": "terms",
            "status": 200,
            "checkedAt": "2026-10-09T18:43:39.940578591Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "3dc978ec9eff"
          }
        ],
        "updatedAt": "2026-10-10T03:53:26.942763537Z"
      }
    },
    "answer": "PlantUML scores 66.9 (B) on agent readiness against Excalidraw's 54.5 (C), and leads in 5 of 7 scored categories. Excalidraw leads on security \u0026 auth.",
    "b": {
      "slug": "plantuml",
      "name": "PlantUML",
      "vendor": "PlantUML project (Arnaud Roques)",
      "vendorUrl": "https://plantuml.com",
      "kind": "sdk",
      "category": "diagramming",
      "summary": "PlantUML is open-source software that turns text descriptions into UML, architecture, Gantt, mind map and other diagrams. Agents run it as a Java command-line tool, a Java library, a local HTTP server or the `@plantuml/mcp-js` MCP server.",
      "url": "https://www.anchorterminal.com/tools/plantuml",
      "markdownUrl": "https://www.anchorterminal.com/tools/plantuml.md",
      "slimMarkdownUrl": "https://www.anchorterminal.com/tools/plantuml.min.md",
      "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/plantuml.json",
      "repo": "https://github.com/plantuml/plantuml",
      "license": "GPL-3.0-or-later",
      "transports": [],
      "packages": [
        {
          "registry": "maven",
          "name": "net.sourceforge.plantuml:plantuml"
        },
        {
          "registry": "npm",
          "name": "@plantuml/mcp-js"
        },
        {
          "registry": "oci",
          "name": "plantuml/plantuml"
        }
      ],
      "auth": "none",
      "authNotes": "No account, key or login. The jar, the Java library and the MCP server run on the owner's machine with the owner's file and network rights. The built-in `-picoweb` HTTP server has no authentication and listens on all interfaces unless a bind address is given.",
      "pricing": "free",
      "pricingNotes": "Free under GPL-3.0-or-later, with the same source also under GPL-2.0, LGPL, Apache-2.0, BSD-3-Clause, EPL and MIT. Nothing to buy. The project takes donations through GitHub Sponsors and Patreon.",
      "priceSummary": "Free · OSS",
      "where": "local",
      "x402": {
        "level": "no",
        "evidence": "No x402, MPP or L402 in the docs or the source (checked 2026-10-08).",
        "endpoints": []
      },
      "toolCount": null,
      "popularity": {
        "githubStars": 13356,
        "npmWeekly": 207,
        "pypiWeekly": null,
        "asOf": "2026-10-08"
      },
      "docsUrl": "https://plantuml.com/command-line",
      "capabilities": [
        "diagram.as-code",
        "diagram.create",
        "diagram.export",
        "diagram.architecture"
      ],
      "tags": [
        "open-source",
        "local",
        "cli",
        "java",
        "mcp",
        "diagram-as-code",
        "uml",
        "no-auth",
        "free",
        "docker"
      ],
      "lastRelease": "2026-09-05",
      "graded": true,
      "anchor": {
        "graded": true,
        "score": 66.9,
        "grade": "B",
        "agentReady": false,
        "rank": 270,
        "ranked": true,
        "rankOf": 950,
        "categoryRank": 1,
        "methodology": "0.4",
        "run": "2026-10-01",
        "scores": {
          "ergonomics": 78,
          "maintenance": 73,
          "payments": 60,
          "reliability": 83,
          "schema": 65,
          "security": 50,
          "transparency": 73
        },
        "pending": [
          "performance",
          "tasks"
        ],
        "assessment": {
          "confidence": "medium",
          "date": "2026-10-08"
        },
        "negative": -2,
        "negativeNotes": [
          "27 February 2026. Release 1.2026.2 switched off chronology diagrams, and its change log calls the removal temporary. On 8 October 2026 the factory is still commented out in `PSystemBuilder.java`, while the README lists the chronology diagram as supported and https://plantuml.com/chronology-diagram documents it. Two points, because the removal is in the change log (https://github.com/plantuml/plantuml/blob/master/CHANGES.md)."
        ],
        "verdict": "One Java command reads diagram text from stdin and writes PNG, SVG, PDF or ASCII with no account, and CI passed on the last eight pushes. The default security profile lets diagram text read any local file and fetch any URL, and the documentation still lists chronology diagrams that release 1.2026.2 switched off.",
        "bestFor": "Agents that write sequence, class, state, component, deployment, Gantt or C4 diagrams as text and render them locally or in CI.",
        "strengths": [
          "`java -jar plantuml.jar -pipe` reads a diagram from stdin and writes PNG, SVG, PDF, EPS, LaTeX or ASCII to stdout, with no account or key",
          "`--check-syntax` and `-stdrpt` report errors as `file:line:error` lines, and exit codes 0, 50, 100 and 200 are documented",
          "The official `@plantuml/mcp-js` server has four tools, needs only Node.js, and returns the same SVG bytes for the same source on any machine",
          "Version 1.2026.8 of 5 September 2026 is on GitHub, Maven Central, Homebrew and Docker Hub, and the `ci` workflow passed on the last eight pushes",
          "The same source is available under GPL-3.0-or-later, GPL-2.0, LGPL, Apache-2.0, BSD-3-Clause, EPL and MIT, and generated images carry no licence obligation"
        ],
        "weaknesses": [
          "The default security profile is LEGACY, which gives diagram text full access to local files and URLs through `!include`. The docs say it will be removed, with no date",
          "`-picoweb` listens on all network interfaces by default and has no authentication",
          "Chronology diagrams were switched off in 1.2026.2 on 27 February 2026 and are still listed in the README and documented on plantuml.com",
          "The command-line page gives the HTTP server's default port as 4242 in one help listing and 8080 in another. The source uses 8080",
          "No llms.txt, no security.txt and no published advisories. The security policy is one email address, and 575 issues are open"
        ],
        "agentNotes": [
          "Set `PLANTUML_SECURITY_PROFILE` to `SANDBOX` or `ALLOWLIST` before rendering text from an untrusted source. The default profile lets `!include` read local files and fetch URLs",
          "Run `java -jar plantuml.jar --check-syntax` with `-stdrpt` first and read the exit status. Without `--no-error-image` a syntax error still writes an image of the error text",
          "Pass `-pipe` with `--svg`, `--txt` or `--utxt` to work without files. `--txt` output suits a text-only model",
          "Start the local server as `-picoweb:8080:127.0.0.1`. Without the bind address it listens on every interface",
          "Use `npx -y @plantuml/mcp-js` when no Java runtime is present. It renders SVG only, so use the jar for PNG or PDF"
        ],
        "metrics": {
          "kind": "local",
          "measured": false
        },
        "reviewCount": 0,
        "avgRating": 0,
        "history": [
          {
            "basis": "public evidence",
            "confidence": "medium",
            "grade": "B",
            "methodology": "0.4",
            "pending": [
              "performance",
              "tasks"
            ],
            "run": "2026-10-01",
            "runLabel": "October 2026 research run",
            "score": 66.9
          }
        ],
        "editorialScores": {
          "ergonomics": 78,
          "maintenance": 73,
          "payments": 60,
          "reliability": 83,
          "schema": 65,
          "security": 50,
          "transparency": 73
        },
        "provenanceScore": 73
      },
      "connect": {
        "install": "brew install plantuml   # or download plantuml.jar from https://github.com/plantuml/plantuml/releases, or docker run ghcr.io/plantuml/plantuml",
        "config": {
          "mcpServers": {
            "plantuml-js": {
              "args": [
                "-y",
                "@plantuml/mcp-js"
              ],
              "command": "npx"
            }
          }
        }
      },
      "letme": {
        "capability": "https://letme.dev/diagram.as-code",
        "tool": "https://letme.dev/plantuml"
      },
      "area": "design-diagrams",
      "provenance": {
        "legalEntity": "No legal entity found. Copyright Arnaud Roques",
        "domain": "plantuml.com",
        "domainRegistered": "2010-11-28",
        "endpointOnVendorDomain": null,
        "terms": "",
        "privacy": "",
        "statusPage": "",
        "changelog": "https://github.com/plantuml/plantuml/blob/master/CHANGES.md",
        "securityTxt": "none",
        "checked": "2026-10-08",
        "notes": [
          "`LICENSES.md` reads Copyright (C) 2009-2026, Arnaud Roques. No company or foundation is named in the repository or on the pages read",
          "No terms or privacy document governs the software. The GPL-3.0-or-later licence, or one of the six alternatives, stands in",
          "https://plantuml.com/.well-known/security.txt answered 404 on 8 October 2026. `docs/SECURITY.md` asks for reports by email to a Gmail address",
          "The lead named PlantUML as vendor. It is a community project led by one author, with no company behind it that we found"
        ],
        "score": 73
      },
      "pageJsonUrl": "https://www.anchorterminal.com/tools/plantuml.json",
      "live": {
        "slug": "plantuml",
        "versions": [
          {
            "registry": "github",
            "name": "plantuml/plantuml",
            "version": "v1.2026.8",
            "released": "2026-09-05",
            "seenAt": "2026-10-09T17:13:38.093637775Z"
          },
          {
            "registry": "npm",
            "name": "@plantuml/mcp-js",
            "version": "0.2.2",
            "seenAt": "2026-10-09T17:13:37.231958705Z"
          }
        ],
        "githubStars": 13357,
        "npmWeekly": 211,
        "securityTxt": {
          "url": "https://plantuml.com/.well-known/security.txt",
          "state": "none",
          "checkedAt": "2026-10-09T15:39:50.311845942Z"
        },
        "pages": [
          {
            "url": "https://raw.githubusercontent.com/plantuml/plantuml/master/CHANGES.md",
            "kind": "changelog",
            "status": 200,
            "checkedAt": "2026-10-09T18:45:55.134028932Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "b79647d80ba7"
          }
        ],
        "updatedAt": "2026-10-09T18:45:55.134028932Z"
      }
    },
    "facts": [
      {
        "a": "HTTP API",
        "b": "SDK + MCP",
        "name": "Kind"
      },
      {
        "a": "Excalidraw s.r.o.",
        "b": "PlantUML project (Arnaud Roques)",
        "name": "Vendor"
      },
      {
        "a": "https://api.excalidraw.com/api/v1/mcp",
        "b": "no (local only)",
        "name": "Hosted endpoint"
      },
      {
        "a": "HTTP, Streamable HTTP",
        "b": "",
        "name": "Transports"
      },
      {
        "a": "API key",
        "b": "None",
        "name": "Auth"
      },
      {
        "a": "Freemium",
        "b": "Free",
        "name": "Pricing"
      },
      {
        "a": "no",
        "b": "no",
        "name": "x402"
      },
      {
        "a": "Excalidraw+ is a proprietary service under Excalidraw's terms of use. The editor and the MCP App on GitHub are MIT",
        "b": "GPL-3.0-or-later",
        "name": "Licence"
      },
      {
        "a": "37",
        "b": "none",
        "name": "Tools exposed"
      },
      {
        "a": "no",
        "b": "no",
        "name": "Read-only variant documented"
      },
      {
        "a": "yes",
        "b": "no",
        "name": "llms.txt"
      },
      {
        "a": "2026-09-01",
        "b": "2026-09-05",
        "name": "Last release"
      },
      {
        "a": "no date given",
        "b": "no document linked",
        "name": "Terms last updated"
      },
      {
        "a": "2021-04-29",
        "b": "no document linked",
        "name": "Privacy policy last updated"
      },
      {
        "a": "not found in the text",
        "b": "",
        "name": "Customer content may train models"
      },
      {
        "a": "yes",
        "b": "",
        "name": "Terms restrict automated access"
      },
      {
        "a": "not found in the text",
        "b": "",
        "name": "Terms restrict benchmarking"
      },
      {
        "a": "yes",
        "b": "",
        "name": "Terms or service can change without notice"
      },
      {
        "a": "yes",
        "b": "",
        "name": "Arbitration or class-action waiver"
      },
      {
        "a": "134k stars, 676k npm/wk",
        "b": "13k stars, 207 npm/wk",
        "name": "Popularity"
      }
    ],
    "faq": [
      {
        "answer": "PlantUML scores 66.9 (B) on agent readiness against Excalidraw's 54.5 (C), and leads in 5 of 7 scored categories. Excalidraw leads on security \u0026 auth.",
        "question": "Which is better for AI agents, Excalidraw or PlantUML?"
      },
      {
        "answer": "Excalidraw has a hosted endpoint at https://api.excalidraw.com/api/v1/mcp. No hosted endpoint is listed for PlantUML.",
        "question": "Can an agent call Excalidraw and PlantUML without installing anything?"
      },
      {
        "answer": "Yes. Excalidraw is open source (Excalidraw+ is a proprietary service under Excalidraw's terms of use. The editor and the MCP App on GitHub are MIT). PlantUML is open source (GPL-3.0-or-later).",
        "question": "Are Excalidraw and PlantUML open source?"
      }
    ],
    "goodFor": [
      {
        "aheadOn": [
          "Security \u0026 auth, 73 against 50"
        ],
        "also": [
          "A hosted endpoint, with nothing to install"
        ],
        "goodFor": "Teams already on Excalidraw+ that want agents to create and edit hand-drawn diagrams, slides and wireframes in a shared workspace, and one-off sketches through the free MCP App.",
        "slug": "excalidraw",
        "watchFor": "The API and MCP server are in public beta. The docs say endpoints, tool names and schemas may change and to expect breaking changes"
      },
      {
        "aheadOn": [
          "Reliability, 83 against 50",
          "Agent ergonomics, 78 against 58",
          "Payments \u0026 pricing, 60 against 35",
          "Maintenance \u0026 community, 73 against 44",
          "Transparency \u0026 trust, 73 against 63"
        ],
        "also": [
          "No key needed to call it"
        ],
        "goodFor": "Agents that write sequence, class, state, component, deployment, Gantt or C4 diagrams as text and render them locally or in CI.",
        "slug": "plantuml",
        "watchFor": "The default security profile is LEGACY, which gives diagram text full access to local files and URLs through `!include`. The docs say it will be removed, with no date"
      }
    ],
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      "name": "Diagram creation"
    },
    "others": [
      {
        "json": "https://www.anchorterminal.com/compare/cloudviz-vs-excalidraw.json",
        "title": "Cloudviz API vs Excalidraw",
        "url": "https://www.anchorterminal.com/compare/cloudviz-vs-excalidraw"
      },
      {
        "json": "https://www.anchorterminal.com/compare/cloudviz-vs-plantuml.json",
        "title": "Cloudviz API vs PlantUML",
        "url": "https://www.anchorterminal.com/compare/cloudviz-vs-plantuml"
      },
      {
        "json": "https://www.anchorterminal.com/compare/diagrams-so-vs-excalidraw.json",
        "title": "Diagrams.so API + MCP vs Excalidraw",
        "url": "https://www.anchorterminal.com/compare/diagrams-so-vs-excalidraw"
      },
      {
        "json": "https://www.anchorterminal.com/compare/diagrams-so-vs-plantuml.json",
        "title": "Diagrams.so API + MCP vs PlantUML",
        "url": "https://www.anchorterminal.com/compare/diagrams-so-vs-plantuml"
      },
      {
        "json": "https://www.anchorterminal.com/compare/drawio-vs-excalidraw.json",
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      },
      {
        "json": "https://www.anchorterminal.com/compare/drawio-vs-plantuml.json",
        "title": "draw.io + MCP vs PlantUML",
        "url": "https://www.anchorterminal.com/compare/drawio-vs-plantuml"
      },
      {
        "json": "https://www.anchorterminal.com/compare/eraser-vs-excalidraw.json",
        "title": "Eraser API + MCP vs Excalidraw",
        "url": "https://www.anchorterminal.com/compare/eraser-vs-excalidraw"
      },
      {
        "json": "https://www.anchorterminal.com/compare/eraser-vs-plantuml.json",
        "title": "Eraser API + MCP vs PlantUML",
        "url": "https://www.anchorterminal.com/compare/eraser-vs-plantuml"
      },
      {
        "json": "https://www.anchorterminal.com/compare/excalidraw-vs-kroki.json",
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        "url": "https://www.anchorterminal.com/compare/excalidraw-vs-kroki"
      },
      {
        "json": "https://www.anchorterminal.com/compare/excalidraw-vs-lucid.json",
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        "json": "https://www.anchorterminal.com/compare/excalidraw-vs-mermaid-chart.json",
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      {
        "json": "https://www.anchorterminal.com/compare/excalidraw-vs-mural-mcp.json",
        "title": "Excalidraw vs Mural MCP",
        "url": "https://www.anchorterminal.com/compare/excalidraw-vs-mural-mcp"
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      {
        "json": "https://www.anchorterminal.com/compare/excalidraw-vs-structurizr.json",
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      {
        "json": "https://www.anchorterminal.com/compare/excalidraw-vs-tldraw.json",
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        "url": "https://www.anchorterminal.com/compare/excalidraw-vs-tldraw"
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      {
        "json": "https://www.anchorterminal.com/compare/excalidraw-vs-whimsical.json",
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        "url": "https://www.anchorterminal.com/compare/excalidraw-vs-whimsical"
      },
      {
        "json": "https://www.anchorterminal.com/compare/lucid-vs-plantuml.json",
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      {
        "json": "https://www.anchorterminal.com/compare/mermaid-chart-vs-plantuml.json",
        "title": "Mermaid Chart MCP vs PlantUML",
        "url": "https://www.anchorterminal.com/compare/mermaid-chart-vs-plantuml"
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      {
        "json": "https://www.anchorterminal.com/compare/mural-mcp-vs-plantuml.json",
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      {
        "json": "https://www.anchorterminal.com/compare/kroki-vs-plantuml.json",
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    "scores": [
      {
        "by": 33,
        "edge": "plantuml",
        "excalidraw": 50,
        "key": "reliability",
        "name": "Reliability",
        "plantuml": 83,
        "weight": 16
      },
      {
        "key": "performance",
        "name": "Performance",
        "pending": true,
        "weight": 10
      },
      {
        "by": 0,
        "edge": "",
        "excalidraw": 65,
        "key": "schema",
        "name": "Schema \u0026 documentation",
        "plantuml": 65,
        "weight": 13
      },
      {
        "by": 20,
        "edge": "plantuml",
        "excalidraw": 58,
        "key": "ergonomics",
        "name": "Agent ergonomics",
        "plantuml": 78,
        "weight": 13
      },
      {
        "by": 23,
        "edge": "excalidraw",
        "excalidraw": 73,
        "key": "security",
        "name": "Security \u0026 auth",
        "plantuml": 50,
        "weight": 14
      },
      {
        "by": 25,
        "edge": "plantuml",
        "excalidraw": 35,
        "key": "payments",
        "name": "Payments \u0026 pricing",
        "plantuml": 60,
        "weight": 10
      },
      {
        "key": "tasks",
        "name": "Task success",
        "pending": true,
        "weight": 10
      },
      {
        "by": 29,
        "edge": "plantuml",
        "excalidraw": 44,
        "key": "maintenance",
        "name": "Maintenance \u0026 community",
        "plantuml": 73,
        "weight": 7
      },
      {
        "by": 10,
        "edge": "plantuml",
        "excalidraw": 63,
        "key": "transparency",
        "name": "Transparency \u0026 trust",
        "plantuml": 73,
        "weight": 7
      }
    ],
    "summary": "PlantUML scores 66.9 (B) on agent readiness against Excalidraw's 54.5 (C), and leads in 5 of 7 scored categories. Excalidraw leads on security \u0026 auth. Both do diagram creation.",
    "verdicts": {
      "excalidraw": "Excalidraw+ keys carry read or full permission, route restrictions and an expiry, and the MCP server shows a key only the tools its routes allow. The API and MCP server are in public beta with breaking changes expected, sit behind the $6 Plus plan, and have no published OpenAPI file, SDK or idempotency keys.",
      "plantuml": "One Java command reads diagram text from stdin and writes PNG, SVG, PDF or ASCII with no account, and CI passed on the last eight pushes. The default security profile lets diagram text read any local file and fetch any URL, and the documentation still lists chronology diagrams that release 1.2026.2 switched off."
    }
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    "llms": "https://www.anchorterminal.com/llms.txt",
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  "markdown": "PlantUML scores 66.9 (B) on agent readiness against Excalidraw's 54.5 (C), and leads in 5 of 7 scored categories. Excalidraw leads on security \u0026 auth. Both do diagram creation.\n\n- Excalidraw: grade C, 54.5/100, rank #683 of 950. Markdown https://www.anchorterminal.com/tools/excalidraw.md · JSON https://www.anchorterminal.com/api/v1/tools/excalidraw.json\n- PlantUML: grade B, 66.9/100, rank #270 of 950. Markdown https://www.anchorterminal.com/tools/plantuml.md · JSON https://www.anchorterminal.com/api/v1/tools/plantuml.json\n- Best diagramming APIs and diagram-as-code for AI agents: https://www.anchorterminal.com/best/diagramming/index.md\n- All 99 diagrams comparisons: https://www.anchorterminal.com/compare/diagramming/index.md\n\n## Which one, for what\n\n### Excalidraw (C)\n\nGood for: Teams already on Excalidraw+ that want agents to create and edit hand-drawn diagrams, slides and wireframes in a shared workspace, and one-off sketches through the free MCP App.\n\nAhead on:\n- Security \u0026 auth, 73 against 50\n\nAlso in its favour:\n- A hosted endpoint, with nothing to install\n\nWatch for: The API and MCP server are in public beta. The docs say endpoints, tool names and schemas may change and to expect breaking changes\n\n### PlantUML (B)\n\nGood for: Agents that write sequence, class, state, component, deployment, Gantt or C4 diagrams as text and render them locally or in CI.\n\nAhead on:\n- Reliability, 83 against 50\n- Agent ergonomics, 78 against 58\n- Payments \u0026 pricing, 60 against 35\n- Maintenance \u0026 community, 73 against 44\n- Transparency \u0026 trust, 73 against 63\n\nAlso in its favour:\n- No key needed to call it\n\nWatch for: The default security profile is LEGACY, which gives diagram text full access to local files and URLs through `!include`. The docs say it will be removed, with no date\n\n\n## Score by category\n\n| Category | Weight | Excalidraw | PlantUML | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 50 | 83 | PlantUML +33 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 65 | 65 | even |\n| Agent ergonomics | 13% (16.2 this run) | 58 | 78 | PlantUML +20 |\n| Security \u0026 auth | 14% (17.5 this run) | 73 | 50 | Excalidraw +23 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 35 | 60 | PlantUML +25 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 44 | 73 | PlantUML +29 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 63 | 73 | PlantUML +10 |\n| Negative events | ≤15 | -2 | -2 | |\n| **Total** | | **54.5 · C** | **66.9 · B** | |\n\n## Facts side by side\n\n| Fact | Excalidraw | PlantUML |\n| --- | --- | --- |\n| Kind | HTTP API | SDK + MCP |\n| Vendor | Excalidraw s.r.o. | PlantUML project (Arnaud Roques) |\n| Hosted endpoint | `https://api.excalidraw.com/api/v1/mcp` | no (local only) |\n| Transports | HTTP, Streamable HTTP |  |\n| Auth | API key | None |\n| Pricing | Freemium | Free |\n| x402 | no | no |\n| Licence | Excalidraw+ is a proprietary service under Excalidraw's terms of use. The editor and the MCP App on GitHub are MIT | GPL-3.0-or-later |\n| Tools exposed | 37 | none |\n| Read-only variant documented | no | no |\n| llms.txt | yes | no |\n| Last release | 2026-09-01 | 2026-09-05 |\n| Terms last updated | no date given | no document linked |\n| Privacy policy last updated | 2021-04-29 | no document linked |\n| Customer content may train models | not found in the text |  |\n| Terms restrict automated access | yes |  |\n| Terms restrict benchmarking | not found in the text |  |\n| Terms or service can change without notice | yes |  |\n| Arbitration or class-action waiver | yes |  |\n| Popularity | 134k stars, 676k npm/wk | 13k stars, 207 npm/wk |\n\n## Verdicts\n\n**Excalidraw.** Excalidraw+ keys carry read or full permission, route restrictions and an expiry, and the MCP server shows a key only the tools its routes allow. The API and MCP server are in public beta with breaking changes expected, sit behind the $6 Plus plan, and have no published OpenAPI file, SDK or idempotency keys.\n\n**PlantUML.** One Java command reads diagram text from stdin and writes PNG, SVG, PDF or ASCII with no account, and CI passed on the last eight pushes. The default security profile lets diagram text read any local file and fetch any URL, and the documentation still lists chronology diagrams that release 1.2026.2 switched off.\n\n## Before you call either\n\n### Excalidraw\n\n1. Send `Authorization: Bearer \u003cAPI_KEY\u003e` to https://api.excalidraw.com/api/v1. For MCP, use `POST /api/v1/mcp` only. The server is stateless and answers 405 to other methods\n2. Use a personal key to reach the owner's private collection with the collection ID `private`. A workspace admin must enable personal keys first\n3. Call `read_diagram_format`, `read_presentation_format` or `read_freeform_format` before the first scene write in a session\n4. Write with `edit_scene_content` and bind arrows through `startBinding` and `endBinding` with `tempId` references. `PUT /scenes/{sceneId}/content` removes every element left out of the request\n5. Stay under 600 requests a minute per IP and wait until `X-RateLimit-Reset` after a 429\n\n### PlantUML\n\n1. Set `PLANTUML_SECURITY_PROFILE` to `SANDBOX` or `ALLOWLIST` before rendering text from an untrusted source. The default profile lets `!include` read local files and fetch URLs\n2. Run `java -jar plantuml.jar --check-syntax` with `-stdrpt` first and read the exit status. Without `--no-error-image` a syntax error still writes an image of the error text\n3. Pass `-pipe` with `--svg`, `--txt` or `--utxt` to work without files. `--txt` output suits a text-only model\n4. Start the local server as `-picoweb:8080:127.0.0.1`. Without the bind address it listens on every interface\n5. Use `npx -y @plantuml/mcp-js` when no Java runtime is present. It renders SVG only, so use the jar for PNG or PDF\n\n## Questions\n\n### Which is better for AI agents, Excalidraw or PlantUML?\n\nPlantUML scores 66.9 (B) on agent readiness against Excalidraw's 54.5 (C), and leads in 5 of 7 scored categories. Excalidraw leads on security \u0026 auth.\n\n### Can an agent call Excalidraw and PlantUML without installing anything?\n\nExcalidraw has a hosted endpoint at https://api.excalidraw.com/api/v1/mcp. No hosted endpoint is listed for PlantUML.\n\n### Are Excalidraw and PlantUML open source?\n\nYes. Excalidraw is open source (Excalidraw+ is a proprietary service under Excalidraw's terms of use. The editor and the MCP App on GitHub are MIT). PlantUML is open source (GPL-3.0-or-later).\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/excalidraw-vs-plantuml.json, and with the fewest tokens: https://www.anchorterminal.com/compare/excalidraw-vs-plantuml.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"excalidraw\", \"b\": \"plantuml\"}`. From a terminal: `anchor compare excalidraw plantuml`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/excalidraw.json and https://www.anchorterminal.com/api/v1/tools/plantuml.json\n\n## Other comparisons with Excalidraw or PlantUML\n\n- [Cloudviz API vs Excalidraw](https://www.anchorterminal.com/compare/cloudviz-vs-excalidraw.md)\n- [Cloudviz API vs PlantUML](https://www.anchorterminal.com/compare/cloudviz-vs-plantuml.md)\n- [Diagrams.so API + MCP vs Excalidraw](https://www.anchorterminal.com/compare/diagrams-so-vs-excalidraw.md)\n- [Diagrams.so API + MCP vs PlantUML](https://www.anchorterminal.com/compare/diagrams-so-vs-plantuml.md)\n- [draw.io + MCP vs Excalidraw](https://www.anchorterminal.com/compare/drawio-vs-excalidraw.md)\n- [draw.io + MCP vs PlantUML](https://www.anchorterminal.com/compare/drawio-vs-plantuml.md)\n- [Eraser API + MCP vs Excalidraw](https://www.anchorterminal.com/compare/eraser-vs-excalidraw.md)\n- [Eraser API + MCP vs PlantUML](https://www.anchorterminal.com/compare/eraser-vs-plantuml.md)\n- [Excalidraw vs Kroki](https://www.anchorterminal.com/compare/excalidraw-vs-kroki.md)\n- [Excalidraw vs Lucid API + MCP](https://www.anchorterminal.com/compare/excalidraw-vs-lucid.md)\n- [Excalidraw vs Mermaid Chart MCP](https://www.anchorterminal.com/compare/excalidraw-vs-mermaid-chart.md)\n- [Excalidraw vs Mural MCP](https://www.anchorterminal.com/compare/excalidraw-vs-mural-mcp.md)\n- [Excalidraw vs Structurizr + MCP](https://www.anchorterminal.com/compare/excalidraw-vs-structurizr.md)\n- [Excalidraw vs tldraw SDK + MCP](https://www.anchorterminal.com/compare/excalidraw-vs-tldraw.md)\n- [Excalidraw vs Whimsical MCP](https://www.anchorterminal.com/compare/excalidraw-vs-whimsical.md)\n- [Lucid API + MCP vs PlantUML](https://www.anchorterminal.com/compare/lucid-vs-plantuml.md)\n- [Mermaid Chart MCP vs PlantUML](https://www.anchorterminal.com/compare/mermaid-chart-vs-plantuml.md)\n- [Mural MCP vs PlantUML](https://www.anchorterminal.com/compare/mural-mcp-vs-plantuml.md)\n- [PlantUML vs Whimsical MCP](https://www.anchorterminal.com/compare/plantuml-vs-whimsical.md)\n- [D2 vs Excalidraw](https://www.anchorterminal.com/compare/d2-vs-excalidraw.md)\n- [D2 vs PlantUML](https://www.anchorterminal.com/compare/d2-vs-plantuml.md)\n- [Kroki vs PlantUML](https://www.anchorterminal.com/compare/kroki-vs-plantuml.md)\n- [PlantUML vs Structurizr + MCP](https://www.anchorterminal.com/compare/plantuml-vs-structurizr.md)\n- [PlantUML vs tldraw SDK + MCP](https://www.anchorterminal.com/compare/plantuml-vs-tldraw.md)\n",
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