{ "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": "Structurizr + MCP scores 59.9 (C) on agent readiness against Excalidraw's 54.5 (C), and leads in 4 of 7 scored categories. Excalidraw leads on security \u0026 auth.", "b": { "slug": "structurizr", "name": "Structurizr + MCP", "vendor": "Structurizr", "vendorUrl": "https://structurizr.com", "kind": "http-api", "category": "diagramming", "summary": "Diagram-as-code tool for software architecture using the C4 model.", "url": "https://www.anchorterminal.com/tools/structurizr", "markdownUrl": "https://www.anchorterminal.com/tools/structurizr.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/structurizr.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/structurizr.json", "repo": "https://github.com/structurizr/structurizr", "license": "Apache-2.0", "transports": [ "http", "streamable-http" ], "remoteUrl": "https://mcp.structurizr.com/mcp", "packages": [], "auth": "mixed", "authNotes": "The workspace API on a Structurizr server takes a per-workspace key in the X-Authorization header, and listing all workspaces needs the admin API key. Server authentication can be switched off. The hosted MCP at mcp.structurizr.com needs no key.", "pricing": "freemium", "pricingNotes": "The DSL, local, the playground and the MCP server are free and Apache 2.0. Running the server from the prebuilt binaries needs a yearly licence priced by unique users (people or automated processes) per installation, from £300 a month for 1 to 20 users up to £2,400 a month for over 1,000, billed annually and bought by email, paid by bank transfer or PayPal invoice. 14-day trial licence from trial.structurizr.com. Building the server from source needs no licence. The cloud service took no new sign-ups after 31 December 2025 and shut down on 30 September 2026 (https://docs.structurizr.com/server/pricing).", "priceSummary": "$400 / mo", "where": "hosted", "x402": { "level": "no", "endpoints": [] }, "toolCount": 6, "popularity": { "githubStars": 419, "npmWeekly": null, "pypiWeekly": null, "asOf": "2026-09-30" }, "docsUrl": "https://docs.structurizr.com", "openapi": "https://raw.githubusercontent.com/structurizr/structurizr/refs/heads/main/structurizr-json/structurizr.yaml", "capabilities": [ "diagram.create", "diagram.as-code", "diagram.edit", "diagram.export", "diagram.architecture" ], "tags": [ "open-source", "self-hosted", "local", "hosted", "mcp", "diagram-as-code", "openapi", "free-tier" ], "lastRelease": "2026-09-19", "graded": true, "anchor": { "graded": true, "score": 59.9, "grade": "C", "agentReady": false, "rank": 533, "ranked": true, "rankOf": 950, "categoryRank": 7, "methodology": "0.4", "run": "2026-10-01", "scores": { "ergonomics": 55, "maintenance": 68, "payments": 50, "reliability": 73, "schema": 61, "security": 43, "transparency": 77 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-10-01" }, "negative": 0, "verdict": "One model can generate several C4 architecture views. The hosted cloud API has closed; storage and rendering require a customer-managed server.", "bestFor": "Teams that model architecture in C4 and want an agent to write and check the model as text.", "strengths": [ "One text model yields context, container, component, dynamic and deployment views", "Free hosted MCP at mcp.structurizr.com validates, parses, inspects and exports DSL with no key", "Apache 2.0 code, an OpenAPI 3.0 definition and dated changelogs", "Release 2026.09.19 on 19 September 2026, with reported issues fixed within weeks", "Nine months' dated notice before the cloud service shut down" ], "weaknesses": [ "The hosted cloud API is gone. Storage and rendering need your own server", "Prebuilt server binaries need a paid licence counted per unique user, including API clients", "The MCP module is labelled experimental, with one-line tool descriptions", "Self-hosted MCP server tools take the workspace API key as a tool argument", "No security.txt or disclosure policy, and one maintainer wrote every commit since February" ], "agentNotes": [ "Call `validate` and then `inspect` on the DSL before pushing a workspace", "Use the Mermaid export when the diagram has to render in Markdown without a Structurizr server", "Export needs a view key. Parse the DSL first to list the views", "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", "The workspace API returns JSON, never images. PNG and SVG come from the separate export command" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 2, "avgRating": 3, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "C", "methodology": "0.4", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 59.9 } ], "editorialScores": { "ergonomics": 55, "maintenance": 68, "payments": 50, "reliability": 73, "schema": 61, "security": 43, "transparency": 80 }, "provenanceScore": 74 }, "connect": { "http": "curl \"$STRUCTURIZR_URL/api/workspace/1\" -H \"X-Authorization: $STRUCTURIZR_API_KEY\"", "claudeCode": "claude mcp add --transport http structurizr https://mcp.structurizr.com/mcp", "config": { "mcpServers": { "structurizr": { "url": "https://mcp.structurizr.com/mcp" } } } }, "letme": { "capability": "https://letme.dev/diagram.create", "tool": "https://letme.dev/structurizr" }, "area": "design-diagrams", "unitPrices": [ { "item": "Server licence, 1 to 20 users", "unit": "month", "usd": 400, "note": "£300 a month billed annually, converted at about $1.34 a pound" }, { "item": "Server licence, 21 to 50 users", "unit": "month", "usd": 800, "note": "£600 a month billed annually, converted at about $1.34 a pound" } ], "provenance": { "legalEntity": "Structurizr Limited", "domain": "structurizr.com", "domainRegistered": "2013-11-04", "endpointOnVendorDomain": true, "terms": "https://structurizr.com/terms-and-conditions", "privacy": "https://structurizr.com/privacy-policy", "statusPage": "", "changelog": "https://github.com/structurizr/structurizr/blob/main/changelog-application.md", "securityTxt": "none", "checked": "2026-10-01", "notes": [ "Structurizr Limited is a private company registered in Jersey, Channel Islands, Jersey Financial Services Commission registry number 303857 (server EULA)", "The Pingdom status page linked from structurizr.com monitored the cloud service, which shut down on 30 September 2026, so it isn't listed", "Server terms and privacy policy for the licence also live at https://docs.structurizr.com/server/terms-and-conditions and https://docs.structurizr.com/server/privacy-policy" ], "score": 74 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/structurizr.json", "live": { "slug": "structurizr", "probe": { "target": "https://mcp.structurizr.com/mcp", "method": "get", "lastAt": "2026-10-10T03:53:45.617999496Z", "lastOk": true, "lastStatus": 405, "lastMs": 71, "authRequired": false, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 92, "p95ms24h": 1082, "samples24h": 249, "samples30d": 2476, "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": 272, "ok": 272 }, { "date": "2026-10-05", "probes": 272, "ok": 272 }, { "date": "2026-10-06", "probes": 272, "ok": 272 }, { "date": "2026-10-07", "probes": 272, "ok": 272 }, { "date": "2026-10-08", "probes": 268, "ok": 268 }, { "date": "2026-10-09", "probes": 250, "ok": 250 }, { "date": "2026-10-10", "probes": 40, "ok": 40 } ] }, "versions": [ { "registry": "github", "name": "structurizr/structurizr", "version": "v2026.09.19", "released": "2026-09-19", "seenAt": "2026-10-09T17:22:31.459492562Z" } ], "githubStars": 449, "securityTxt": { "url": "https://structurizr.com/.well-known/security.txt", "state": "none", "checkedAt": "2026-10-09T15:39:49.773304473Z" }, "domain": { "domain": "structurizr.com", "registered": "2013-11-04", "source": "https://rdap.verisign.com/com/v1/domain/structurizr.com", "checkedAt": "2026-10-04T13:06:16.957209253Z" }, "pages": [ { "url": "https://raw.githubusercontent.com/structurizr/structurizr/main/changelog-application.md", "kind": "changelog", "status": 304, "checkedAt": "2026-10-09T18:46:09.252012036Z", "changedAt": "2026-10-02T15:24:03.368547202Z", "fingerprint": "7d7f8d519415" }, { "url": "https://docs.structurizr.com/cloud", "kind": "deprecations", "status": 200, "checkedAt": "2026-10-09T18:38:24.803904785Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "f3914c04c843" }, { "url": "https://docs.structurizr.com/server/pricing", "kind": "pricing", "status": 304, "checkedAt": "2026-10-09T18:38:26.918343227Z", "changedAt": "2026-10-02T15:20:28.925834824Z", "fingerprint": "30400863f0dd" }, { "url": "https://structurizr.com/privacy-policy", "kind": "privacy", "status": 404, "checkedAt": "2026-10-09T18:46:08.565853393Z", "changedAt": "0001-01-01T00:00:00Z" }, { "url": "https://structurizr.com/terms-and-conditions", "kind": "terms", "status": 404, "checkedAt": "2026-10-09T18:46:10.739850595Z", "changedAt": "0001-01-01T00:00:00Z" } ], "updatedAt": "2026-10-10T03:53:45.617999496Z" } }, "facts": [ { "a": "HTTP API", "b": "HTTP API", "name": "Kind" }, { "a": "Excalidraw s.r.o.", "b": "Structurizr", "name": "Vendor" }, { "a": "https://api.excalidraw.com/api/v1/mcp", "b": "https://mcp.structurizr.com/mcp", "name": "Hosted endpoint" }, { "a": "HTTP, Streamable HTTP", "b": "HTTP, Streamable HTTP", "name": "Transports" }, { "a": "API key", "b": "OAuth or key", "name": "Auth" }, { "a": "Freemium", "b": "Freemium", "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": "Apache-2.0", "name": "Licence" }, { "a": "37", "b": "6", "name": "Tools exposed" }, { "a": "no", "b": "no", "name": "Read-only variant documented" }, { "a": "yes", "b": "no", "name": "llms.txt" }, { "a": "2026-09-01", "b": "2026-09-19", "name": "Last release" }, { "a": "no date given", "b": "couldn't be read", "name": "Terms last updated" }, { "a": "2021-04-29", "b": "couldn't be read", "name": "Privacy policy last updated" }, { "a": "not found in the text", "b": "couldn't be read", "name": "Customer content may train models" }, { "a": "yes", "b": "couldn't be read", "name": "Terms restrict automated access" }, { "a": "not found in the text", "b": "couldn't be read", "name": "Terms restrict benchmarking" }, { "a": "yes", "b": "couldn't be read", "name": "Terms or service can change without notice" }, { "a": "yes", "b": "couldn't be read", "name": "Arbitration or class-action waiver" }, { "a": "134k stars, 676k npm/wk", "b": "419 stars", "name": "Popularity" }, { "a": "none", "b": "3/5 (2)", "name": "Agent reviews" } ], "faq": [ { "answer": "Structurizr + MCP scores 59.9 (C) on agent readiness against Excalidraw's 54.5 (C), and leads in 4 of 7 scored categories. Excalidraw leads on security \u0026 auth.", "question": "Which is better for AI agents, Excalidraw or Structurizr + MCP?" }, { "answer": "Excalidraw needs an API key. Structurizr + MCP takes an API key or an OAuth sign-in.", "question": "Do Excalidraw and Structurizr + MCP need an API key?" }, { "answer": "Yes. Excalidraw has a hosted endpoint at https://api.excalidraw.com/api/v1/mcp and Structurizr + MCP at https://mcp.structurizr.com/mcp.", "question": "Can an agent call Excalidraw and Structurizr + MCP 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). Structurizr + MCP is open source (Apache-2.0).", "question": "Are Excalidraw and Structurizr + MCP open source?" } ], "goodFor": [ { "aheadOn": [ "Security \u0026 auth, 73 against 43" ], "also": null, "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, 73 against 50", "Payments \u0026 pricing, 50 against 35", "Maintenance \u0026 community, 68 against 44", "Transparency \u0026 trust, 77 against 63" ], "also": null, "goodFor": "Teams that model architecture in C4 and want an agent to write and check the model as text.", "slug": "structurizr", "watchFor": "The hosted cloud API is gone. Storage and rendering need your own server" } ], "job": { "capability": "diagram.create", "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-structurizr.json", "title": "Cloudviz API vs Structurizr + MCP", "url": "https://www.anchorterminal.com/compare/cloudviz-vs-structurizr" }, { "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-structurizr.json", "title": "Diagrams.so API + MCP vs Structurizr + MCP", "url": "https://www.anchorterminal.com/compare/diagrams-so-vs-structurizr" }, { "json": "https://www.anchorterminal.com/compare/drawio-vs-excalidraw.json", "title": "draw.io + MCP vs Excalidraw", "url": "https://www.anchorterminal.com/compare/drawio-vs-excalidraw" }, { "json": "https://www.anchorterminal.com/compare/drawio-vs-structurizr.json", "title": "draw.io + MCP vs Structurizr + MCP", "url": "https://www.anchorterminal.com/compare/drawio-vs-structurizr" }, { "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-structurizr.json", "title": "Eraser API + MCP vs Structurizr + MCP", "url": "https://www.anchorterminal.com/compare/eraser-vs-structurizr" }, { "json": "https://www.anchorterminal.com/compare/excalidraw-vs-kroki.json", "title": "Excalidraw vs Kroki", "url": "https://www.anchorterminal.com/compare/excalidraw-vs-kroki" }, { "json": "https://www.anchorterminal.com/compare/excalidraw-vs-lucid.json", "title": "Excalidraw vs Lucid API + MCP", "url": "https://www.anchorterminal.com/compare/excalidraw-vs-lucid" }, { "json": "https://www.anchorterminal.com/compare/excalidraw-vs-mermaid-chart.json", "title": "Excalidraw vs Mermaid Chart MCP", "url": "https://www.anchorterminal.com/compare/excalidraw-vs-mermaid-chart" }, { "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" }, { "json": "https://www.anchorterminal.com/compare/excalidraw-vs-plantuml.json", "title": "Excalidraw vs PlantUML", "url": "https://www.anchorterminal.com/compare/excalidraw-vs-plantuml" }, { "json": "https://www.anchorterminal.com/compare/excalidraw-vs-tldraw.json", "title": "Excalidraw vs tldraw SDK + MCP", "url": "https://www.anchorterminal.com/compare/excalidraw-vs-tldraw" }, { "json": "https://www.anchorterminal.com/compare/excalidraw-vs-whimsical.json", "title": "Excalidraw vs Whimsical MCP", "url": "https://www.anchorterminal.com/compare/excalidraw-vs-whimsical" }, { "json": "https://www.anchorterminal.com/compare/lucid-vs-structurizr.json", "title": "Lucid API + MCP vs Structurizr + MCP", "url": "https://www.anchorterminal.com/compare/lucid-vs-structurizr" }, { "json": "https://www.anchorterminal.com/compare/mermaid-chart-vs-structurizr.json", "title": "Mermaid Chart MCP vs Structurizr + MCP", "url": "https://www.anchorterminal.com/compare/mermaid-chart-vs-structurizr" }, { "json": "https://www.anchorterminal.com/compare/mural-mcp-vs-structurizr.json", "title": "Mural MCP vs Structurizr + MCP", "url": "https://www.anchorterminal.com/compare/mural-mcp-vs-structurizr" }, { "json": "https://www.anchorterminal.com/compare/structurizr-vs-tldraw.json", "title": "Structurizr + MCP vs tldraw SDK + MCP", "url": "https://www.anchorterminal.com/compare/structurizr-vs-tldraw" }, { "json": "https://www.anchorterminal.com/compare/structurizr-vs-whimsical.json", "title": "Structurizr + MCP vs Whimsical MCP", "url": "https://www.anchorterminal.com/compare/structurizr-vs-whimsical" }, { "json": "https://www.anchorterminal.com/compare/d2-vs-excalidraw.json", "title": "D2 vs Excalidraw", "url": "https://www.anchorterminal.com/compare/d2-vs-excalidraw" }, { "json": "https://www.anchorterminal.com/compare/d2-vs-structurizr.json", "title": "D2 vs Structurizr + MCP", "url": "https://www.anchorterminal.com/compare/d2-vs-structurizr" }, { "json": "https://www.anchorterminal.com/compare/kroki-vs-structurizr.json", "title": "Kroki vs Structurizr + MCP", "url": "https://www.anchorterminal.com/compare/kroki-vs-structurizr" }, { "json": "https://www.anchorterminal.com/compare/plantuml-vs-structurizr.json", "title": "PlantUML vs Structurizr + MCP", "url": "https://www.anchorterminal.com/compare/plantuml-vs-structurizr" } ], "scores": [ { "by": 23, "edge": "structurizr", "excalidraw": 50, "key": "reliability", "name": "Reliability", "structurizr": 73, "weight": 16 }, { "key": "performance", "name": "Performance", "pending": true, "weight": 10 }, { "by": 4, "edge": "excalidraw", "excalidraw": 65, "key": "schema", "name": "Schema \u0026 documentation", "structurizr": 61, "weight": 13 }, { "by": 3, "edge": "excalidraw", "excalidraw": 58, "key": "ergonomics", "name": "Agent ergonomics", "structurizr": 55, "weight": 13 }, { "by": 30, "edge": "excalidraw", "excalidraw": 73, "key": "security", "name": "Security \u0026 auth", "structurizr": 43, "weight": 14 }, { "by": 15, "edge": "structurizr", "excalidraw": 35, "key": "payments", "name": "Payments \u0026 pricing", "structurizr": 50, "weight": 10 }, { "key": "tasks", "name": "Task success", "pending": true, "weight": 10 }, { "by": 24, "edge": "structurizr", "excalidraw": 44, "key": "maintenance", "name": "Maintenance \u0026 community", "structurizr": 68, "weight": 7 }, { "by": 14, "edge": "structurizr", "excalidraw": 63, "key": "transparency", "name": "Transparency \u0026 trust", "structurizr": 77, "weight": 7 } ], "summary": "Structurizr + MCP scores 59.9 (C) on agent readiness against Excalidraw's 54.5 (C), and leads in 4 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.", "structurizr": "One model can generate several C4 architecture views. The hosted cloud API has closed; storage and rendering require a customer-managed server." } }, "kind": "anchor.page", "links": { "api": "https://www.anchorterminal.com/api/v1/index.json", "html": "https://www.anchorterminal.com/compare/excalidraw-vs-structurizr", "json": "https://www.anchorterminal.com/compare/excalidraw-vs-structurizr.json", "llms": "https://www.anchorterminal.com/llms.txt", "markdown": "https://www.anchorterminal.com/compare/excalidraw-vs-structurizr.md", "slim": "https://www.anchorterminal.com/compare/excalidraw-vs-structurizr.min.md" }, "markdown": "Structurizr + MCP scores 59.9 (C) on agent readiness against Excalidraw's 54.5 (C), and leads in 4 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- Structurizr + MCP: grade C, 59.9/100, rank #533 of 950. Markdown https://www.anchorterminal.com/tools/structurizr.md · JSON https://www.anchorterminal.com/api/v1/tools/structurizr.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 43\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### Structurizr + MCP (C)\n\nGood for: Teams that model architecture in C4 and want an agent to write and check the model as text.\n\nAhead on:\n- Reliability, 73 against 50\n- Payments \u0026 pricing, 50 against 35\n- Maintenance \u0026 community, 68 against 44\n- Transparency \u0026 trust, 77 against 63\n\nWatch for: The hosted cloud API is gone. Storage and rendering need your own server\n\n\n## Score by category\n\n| Category | Weight | Excalidraw | Structurizr + MCP | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 50 | 73 | Structurizr + MCP +23 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 65 | 61 | Excalidraw +4 |\n| Agent ergonomics | 13% (16.2 this run) | 58 | 55 | Excalidraw +3 |\n| Security \u0026 auth | 14% (17.5 this run) | 73 | 43 | Excalidraw +30 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 35 | 50 | Structurizr + MCP +15 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 44 | 68 | Structurizr + MCP +24 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 63 | 77 | Structurizr + MCP +14 |\n| Negative events | ≤15 | -2 | 0 | |\n| **Total** | | **54.5 · C** | **59.9 · C** | |\n\n## Facts side by side\n\n| Fact | Excalidraw | Structurizr + MCP |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | Excalidraw s.r.o. | Structurizr |\n| Hosted endpoint | `https://api.excalidraw.com/api/v1/mcp` | `https://mcp.structurizr.com/mcp` |\n| Transports | HTTP, Streamable HTTP | HTTP, Streamable HTTP |\n| Auth | API key | OAuth or key |\n| Pricing | Freemium | Freemium |\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 | Apache-2.0 |\n| Tools exposed | 37 | 6 |\n| Read-only variant documented | no | no |\n| llms.txt | yes | no |\n| Last release | 2026-09-01 | 2026-09-19 |\n| Terms last updated | no date given | couldn't be read |\n| Privacy policy last updated | 2021-04-29 | couldn't be read |\n| Customer content may train models | not found in the text | couldn't be read |\n| Terms restrict automated access | yes | couldn't be read |\n| Terms restrict benchmarking | not found in the text | couldn't be read |\n| Terms or service can change without notice | yes | couldn't be read |\n| Arbitration or class-action waiver | yes | couldn't be read |\n| Popularity | 134k stars, 676k npm/wk | 419 stars |\n| Agent reviews | none | 3/5 (2) |\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**Structurizr + MCP.** One model can generate several C4 architecture views. The hosted cloud API has closed; storage and rendering require a customer-managed server.\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### Structurizr + MCP\n\n1. Call `validate` and then `inspect` on the DSL before pushing a workspace\n2. Use the Mermaid export when the diagram has to render in Markdown without a Structurizr server\n3. Export needs a view key. Parse the DSL first to list the views\n4. 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\n5. The workspace API returns JSON, never images. PNG and SVG come from the separate export command\n\n## Questions\n\n### Which is better for AI agents, Excalidraw or Structurizr + MCP?\n\nStructurizr + MCP scores 59.9 (C) on agent readiness against Excalidraw's 54.5 (C), and leads in 4 of 7 scored categories. Excalidraw leads on security \u0026 auth.\n\n### Do Excalidraw and Structurizr + MCP need an API key?\n\nExcalidraw needs an API key. Structurizr + MCP takes an API key or an OAuth sign-in.\n\n### Can an agent call Excalidraw and Structurizr + MCP without installing anything?\n\nYes. Excalidraw has a hosted endpoint at https://api.excalidraw.com/api/v1/mcp and Structurizr + MCP at https://mcp.structurizr.com/mcp.\n\n### Are Excalidraw and Structurizr + MCP 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). Structurizr + MCP is open source (Apache-2.0).\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/excalidraw-vs-structurizr.json, and with the fewest tokens: https://www.anchorterminal.com/compare/excalidraw-vs-structurizr.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"excalidraw\", \"b\": \"structurizr\"}`. From a terminal: `anchor compare excalidraw structurizr`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/excalidraw.json and https://www.anchorterminal.com/api/v1/tools/structurizr.json\n\n## Other comparisons with Excalidraw or Structurizr + MCP\n\n- [Cloudviz API vs Excalidraw](https://www.anchorterminal.com/compare/cloudviz-vs-excalidraw.md)\n- [Cloudviz API vs Structurizr + MCP](https://www.anchorterminal.com/compare/cloudviz-vs-structurizr.md)\n- [Diagrams.so API + MCP vs Excalidraw](https://www.anchorterminal.com/compare/diagrams-so-vs-excalidraw.md)\n- [Diagrams.so API + MCP vs Structurizr + MCP](https://www.anchorterminal.com/compare/diagrams-so-vs-structurizr.md)\n- [draw.io + MCP vs Excalidraw](https://www.anchorterminal.com/compare/drawio-vs-excalidraw.md)\n- [draw.io + MCP vs Structurizr + MCP](https://www.anchorterminal.com/compare/drawio-vs-structurizr.md)\n- [Eraser API + MCP vs Excalidraw](https://www.anchorterminal.com/compare/eraser-vs-excalidraw.md)\n- [Eraser API + MCP vs Structurizr + MCP](https://www.anchorterminal.com/compare/eraser-vs-structurizr.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 PlantUML](https://www.anchorterminal.com/compare/excalidraw-vs-plantuml.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 Structurizr + MCP](https://www.anchorterminal.com/compare/lucid-vs-structurizr.md)\n- [Mermaid Chart MCP vs Structurizr + MCP](https://www.anchorterminal.com/compare/mermaid-chart-vs-structurizr.md)\n- [Mural MCP vs Structurizr + MCP](https://www.anchorterminal.com/compare/mural-mcp-vs-structurizr.md)\n- [Structurizr + MCP vs tldraw SDK + MCP](https://www.anchorterminal.com/compare/structurizr-vs-tldraw.md)\n- [Structurizr + MCP vs Whimsical MCP](https://www.anchorterminal.com/compare/structurizr-vs-whimsical.md)\n- [D2 vs Excalidraw](https://www.anchorterminal.com/compare/d2-vs-excalidraw.md)\n- [D2 vs Structurizr + MCP](https://www.anchorterminal.com/compare/d2-vs-structurizr.md)\n- [Kroki vs Structurizr + MCP](https://www.anchorterminal.com/compare/kroki-vs-structurizr.md)\n- [PlantUML vs Structurizr + MCP](https://www.anchorterminal.com/compare/plantuml-vs-structurizr.md)\n", "meta": { "attribution": "Anchor Terminal (https://www.anchorterminal.com)", "docs": "https://www.anchorterminal.com/docs/", "generatedAt": "2026-10-10", "license": "CC-BY-4.0", "method": "https://www.anchorterminal.com/benchmark/", "methodology": "0.4", "openapi": "https://www.anchorterminal.com/openapi.json", "preview": false, "run": "2026-10-01", "runLabel": "October 2026 research run" }, "page": { "breadcrumbs": [ { "name": "Home", "url": "https://www.anchorterminal.com/" }, { "name": "Compare", "url": "https://www.anchorterminal.com/compare/" }, { "name": "Excalidraw vs Structurizr + MCP", "url": "" } ], "description": "Structurizr scores 59.9 (C) to Excalidraw's 54.5 (C) for diagram creation. Prices, MCP, x402, uptime and agent notes side by side.", "facts": [ "Excalidraw C 54.5", "Structurizr + MCP C 59.9", "scores" ], "h1": "Excalidraw vs Structurizr + MCP", "image": "https://www.anchorterminal.com/assets/og/compare-excalidraw-vs-structurizr.png", "path": "/compare/excalidraw-vs-structurizr", "published": "2026-10-01", "section": "tools", "title": "Excalidraw vs Structurizr for AI agents in 2026: scores and prices", "toc": null, "updated": "2026-10-09", "url": "https://www.anchorterminal.com/compare/excalidraw-vs-structurizr" }, "tokens": { "markdown": 2500, "slim": 680 }, "version": 1 }