{ "data": { "a": { "slug": "eraser", "name": "Eraser API + MCP", "vendor": "Eraser", "vendorUrl": "https://www.eraser.io", "kind": "http-api", "category": "diagramming", "summary": "Docs and diagrams workspace for engineers.", "url": "https://www.anchorterminal.com/tools/eraser", "markdownUrl": "https://www.anchorterminal.com/tools/eraser.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/eraser.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/eraser.json", "transports": [ "http", "streamable-http", "stdio" ], "remoteUrl": "https://app.eraser.io/api", "packages": [ { "registry": "npm", "name": "@eraserlabs/eraser-mcp" } ], "auth": "mixed", "authNotes": "REST API takes a team API token as a Bearer header, and tokens are only issued to paid teams. The hosted MCP uses OAuth by default (billed to the signed-in user's AI credits) or the same token as a Bearer header (billed to team credits). The local npm server reads ERASER_API_KEY.", "pricing": "freemium", "pricingNotes": "Free plan $0 with 3 AI diagrams. Starter $15 a member a month billed yearly ($20 monthly) with 40 AI credits, Business $45 billed yearly ($60 monthly) with 250, Enterprise custom. The API needs a paid plan with usage-based pricing switched on. /render/prompt costs $80 per 100 calls, /render/elements $20 per 100 calls, extra AI credits $60 per 100. The MCP server is free within plan limits (https://www.eraser.io/pricing).", "priceSummary": "$20 / seat-mo", "where": "both", "x402": { "level": "no", "evidence": "No x402 support in docs or pricing (checked 2026-09-30).", "endpoints": [] }, "toolCount": 42, "popularity": { "githubStars": null, "npmWeekly": 76, "pypiWeekly": null, "asOf": "2026-09-30" }, "docsUrl": "https://docs.eraser.io/reference/getting-started", "llmsTxt": "https://docs.eraser.io/llms.txt", "registryName": "io.eraser/eraser", "capabilities": [ "diagram.create", "diagram.as-code", "diagram.edit", "diagram.export", "diagram.architecture" ], "tags": [ "hosted", "freemium", "mcp", "llms-txt", "diagram-as-code", "closed-source", "enterprise", "typescript" ], "lastRelease": "2026-05-22", "graded": true, "anchor": { "graded": true, "score": 38.6, "grade": "E", "agentReady": false, "rank": 918, "ranked": true, "rankOf": 950, "categoryRank": 12, "methodology": "0.4", "run": "2026-10-01", "scores": { "ergonomics": 34, "maintenance": 33, "payments": 35, "reliability": 15, "schema": 52, "security": 57, "transparency": 50 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-10-01" }, "negative": 0, "verdict": "Hosted MCP with OAuth and 41 tools, including `manually_` tools that skip the AI when the agent writes the diagram code. No status page, rate limits, SLA or changelog.", "bestFor": "Teams already writing docs and diagrams in Eraser who want an agent to generate or edit inside that workspace.", "strengths": [ "Hosted MCP with OAuth and 41 tools, including `manually_` tools that skip the AI when the agent writes the diagram code", "Diagram-as-code for architecture, flowchart, ERD, sequence and BPMN diagrams", "Per-call API prices published, $0.80 per AI render and $0.20 per code render", "SOC 2 Type 2 report, and an audit log API with ECS and Splunk formats on Enterprise" ], "weaknesses": [ "No status page, rate limits, SLA or changelog", "No OpenAPI file, and the hosted tool definitions aren't public", "REST API needs a paid team plus usage-based billing, with one unscoped token per team", "41 tools load at once with no subset", "Newest dated change found is 22 May 2026" ], "agentNotes": [ "Use `manually_create_diagram` with your own Eraser code when you know the structure. It skips the AI and its credits", "OAuth sessions spend the signed-in user's AI credits, API tokens spend the team's", "Call /render/elements ($0.20) when you already have diagram code; /render/prompt costs $0.80", "Set a spend limit before running in CI. At 100 per cent the API stops until the next calendar month" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 2, "avgRating": 3, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "E", "methodology": "0.4", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 38.6 } ], "editorialScores": { "ergonomics": 34, "maintenance": 33, "payments": 35, "reliability": 15, "schema": 52, "security": 57, "transparency": 31 }, "provenanceScore": 68 }, "connect": { "http": "curl -X POST https://app.eraser.io/api/render/prompt -H \"Authorization: Bearer $ERASER_API_KEY\" \\\n -H \"Content-Type: application/json\" -d '{\"text\":\"Draw a data model for a Twitter clone\"}'", "claudeCode": "claude mcp add --transport http eraser https://app.eraser.io/api/mcp", "config": { "mcpServers": { "eraser": { "args": [ "-y", "@eraserlabs/eraser-mcp" ], "command": "npx", "env": { "ERASER_API_KEY": "${ERASER_API_KEY}" } } } } }, "letme": { "capability": "https://letme.dev/diagram.create", "tool": "https://letme.dev/eraser" }, "area": "design-diagrams", "unitPrices": [ { "item": "Starter plan", "unit": "seat-month", "usd": 20, "note": "billed monthly, $15 billed yearly. First plan with API access" }, { "item": "Business plan", "unit": "seat-month", "usd": 60, "note": "billed monthly, $45 billed yearly" }, { "item": "API /render/prompt", "unit": "call", "usd": 0.8, "note": "$80 per 100 calls, AI generation" }, { "item": "API /render/elements", "unit": "call", "usd": 0.2, "note": "$20 per 100 calls, renders your own diagram code" }, { "item": "Extra AI credits", "unit": "credit", "usd": 0.6, "note": "$60 per 100 credits beyond the plan" } ], "provenance": { "legalEntity": "Eraser Labs, Inc.", "domain": "eraser.io", "domainRegistered": "2014-10-03", "endpointOnVendorDomain": true, "terms": "https://www.eraser.io/terms", "privacy": "https://www.eraser.io/privacy", "statusPage": "", "changelog": "", "securityTxt": "none", "checked": "2026-10-01", "notes": [ "Eraser Labs, Inc., 548 Market St, PMB 47670, San Francisco, CA 94104 (privacy policy)", "SOC 2 Type 2 report available through the trust portal at eraser.trustshare.com", "status.eraser.io doesn't resolve and eraser.io/changelog returns 404", "security.txt not rechecked on 2026-10-01; none per the 30 September check" ], "score": 68 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/eraser.json", "live": { "slug": "eraser", "probe": { "target": "https://app.eraser.io/api", "method": "get", "lastAt": "2026-10-10T02:07:08.184108297Z", "lastOk": true, "lastStatus": 404, "lastMs": 152, "authRequired": false, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 147, "p95ms24h": 259, "samples24h": 250, "samples30d": 2458, "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": 22, "ok": 22 } ] }, "versions": [ { "registry": "mcp-registry", "name": "io.eraser/eraser", "version": "0.2.0", "seenAt": "2026-10-09T02:57:46.004536428Z" }, { "registry": "npm", "name": "@eraserlabs/eraser-mcp", "version": "0.8.0", "seenAt": "2026-10-09T16:52:12.920239585Z" } ], "npmWeekly": 50, "securityTxt": { "url": "https://eraser.io/.well-known/security.txt", "state": "none", "checkedAt": "2026-10-09T15:39:52.352672485Z" }, "llmsTxt": { "url": "https://docs.eraser.io/llms.txt", "ok": true, "status": 200, "checkedAt": "2026-10-09T14:01:54.083158677Z" }, "domain": { "domain": "eraser.io", "checkedAt": "2026-10-04T13:07:10.744092154Z" }, "pages": [ { "url": "https://www.eraser.io/pricing", "kind": "pricing", "status": 200, "checkedAt": "2026-10-09T18:49:53.779879748Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "308b8025c589" }, { "url": "https://www.eraser.io/privacy", "kind": "privacy", "status": 200, "checkedAt": "2026-10-09T18:49:55.843434394Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "0a831aeafaf4" }, { "url": "https://www.eraser.io/terms", "kind": "terms", "status": 200, "checkedAt": "2026-10-09T18:49:57.81279529Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "45be14fec815" } ], "updatedAt": "2026-10-10T02:07:08.184108297Z" } }, "answer": "Excalidraw scores 54.5 (C) on agent readiness against Eraser API + MCP's 38.6 (E), and leads in 6 of 7 scored categories.", "b": { "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": "2026-10-10T02:07:08.331803805Z", "lastOk": true, "lastStatus": 405, "lastMs": 354, "authRequired": false, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 338, "p95ms24h": 401, "samples24h": 107, "samples30d": 107, "days": [ { "date": "2026-10-09", "probes": 85, "ok": 85 }, { "date": "2026-10-10", "probes": 22, "ok": 22 } ] }, "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": "2026-10-10T02:07:08.331803805Z" } }, "facts": [ { "a": "HTTP API", "b": "HTTP API", "name": "Kind" }, { "a": "Eraser", "b": "Excalidraw s.r.o.", "name": "Vendor" }, { "a": "https://app.eraser.io/api", "b": "https://api.excalidraw.com/api/v1/mcp", "name": "Hosted endpoint" }, { "a": "HTTP, Streamable HTTP, stdio", "b": "HTTP, Streamable HTTP", "name": "Transports" }, { "a": "OAuth or key", "b": "API key", "name": "Auth" }, { "a": "Freemium", "b": "Freemium", "name": "Pricing" }, { "a": "no", "b": "no", "name": "x402" }, { "a": "none", "b": "Excalidraw+ is a proprietary service under Excalidraw's terms of use. The editor and the MCP App on GitHub are MIT", "name": "Licence" }, { "a": "42", "b": "37", "name": "Tools exposed" }, { "a": "no", "b": "no", "name": "Read-only variant documented" }, { "a": "yes", "b": "yes", "name": "llms.txt" }, { "a": "io.eraser/eraser", "b": "not listed", "name": "MCP registry" }, { "a": "2026-05-22", "b": "2026-09-01", "name": "Last release" }, { "a": "no date given", "b": "no date given", "name": "Terms last updated" }, { "a": "no date given", "b": "2021-04-29", "name": "Privacy policy last updated" }, { "a": "not found in the text", "b": "not found in the text", "name": "Customer content may train models" }, { "a": "not found in the text", "b": "yes", "name": "Terms restrict automated access" }, { "a": "not found in the text", "b": "not found in the text", "name": "Terms restrict benchmarking" }, { "a": "not found in the text", "b": "yes", "name": "Terms or service can change without notice" }, { "a": "not found in the text", "b": "yes", "name": "Arbitration or class-action waiver" }, { "a": "76 npm/wk", "b": "134k stars, 676k npm/wk", "name": "Popularity" }, { "a": "3/5 (2)", "b": "none", "name": "Agent reviews" } ], "faq": [ { "answer": "Excalidraw scores 54.5 (C) on agent readiness against Eraser API + MCP's 38.6 (E), and leads in 6 of 7 scored categories.", "question": "Which is better for AI agents, Eraser API + MCP or Excalidraw?" }, { "answer": "Eraser API + MCP takes an API key or an OAuth sign-in. Excalidraw needs an API key.", "question": "Do Eraser API + MCP and Excalidraw need an API key?" }, { "answer": "Yes. Eraser API + MCP has a hosted endpoint at https://app.eraser.io/api and Excalidraw at https://api.excalidraw.com/api/v1/mcp.", "question": "Can an agent call Eraser API + MCP and Excalidraw without installing anything?" }, { "answer": "No open-source release is listed for Eraser API + MCP. 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).", "question": "Are Eraser API + MCP and Excalidraw open source?" } ], "goodFor": [ { "aheadOn": null, "also": [ "Runs on your own machine" ], "goodFor": "Teams already writing docs and diagrams in Eraser who want an agent to generate or edit inside that workspace.", "slug": "eraser", "watchFor": "No status page, rate limits, SLA or changelog" }, { "aheadOn": [ "Reliability, 50 against 15", "Schema \u0026 documentation, 65 against 52", "Agent ergonomics, 58 against 34", "Security \u0026 auth, 73 against 57", "Maintenance \u0026 community, 44 against 33", "Transparency \u0026 trust, 63 against 50" ], "also": [ "Open source" ], "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" } ], "job": { "capability": "diagram.create", "name": "Diagram creation" }, "others": [ { "json": "https://www.anchorterminal.com/compare/cloudviz-vs-eraser.json", "title": "Cloudviz API vs Eraser API + MCP", "url": "https://www.anchorterminal.com/compare/cloudviz-vs-eraser" }, { "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/diagrams-so-vs-eraser.json", "title": "Diagrams.so API + MCP vs Eraser API + MCP", "url": "https://www.anchorterminal.com/compare/diagrams-so-vs-eraser" }, { "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/drawio-vs-eraser.json", "title": "draw.io + MCP vs Eraser API + MCP", "url": "https://www.anchorterminal.com/compare/drawio-vs-eraser" }, { "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/eraser-vs-kroki.json", "title": "Eraser API + MCP vs Kroki", "url": "https://www.anchorterminal.com/compare/eraser-vs-kroki" }, { "json": "https://www.anchorterminal.com/compare/eraser-vs-lucid.json", "title": "Eraser API + MCP vs Lucid API + MCP", "url": "https://www.anchorterminal.com/compare/eraser-vs-lucid" }, { "json": "https://www.anchorterminal.com/compare/eraser-vs-mermaid-chart.json", "title": "Eraser API + MCP vs Mermaid Chart MCP", "url": "https://www.anchorterminal.com/compare/eraser-vs-mermaid-chart" }, { "json": "https://www.anchorterminal.com/compare/eraser-vs-mural-mcp.json", "title": "Eraser API + MCP vs Mural MCP", "url": "https://www.anchorterminal.com/compare/eraser-vs-mural-mcp" }, { "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/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/eraser-vs-tldraw.json", "title": "Eraser API + MCP vs tldraw SDK + MCP", "url": "https://www.anchorterminal.com/compare/eraser-vs-tldraw" }, { "json": "https://www.anchorterminal.com/compare/eraser-vs-whimsical.json", "title": "Eraser API + MCP vs Whimsical MCP", "url": "https://www.anchorterminal.com/compare/eraser-vs-whimsical" }, { "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-structurizr.json", "title": "Excalidraw vs Structurizr + MCP", "url": "https://www.anchorterminal.com/compare/excalidraw-vs-structurizr" }, { "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/d2-vs-eraser.json", "title": "D2 vs Eraser API + MCP", "url": "https://www.anchorterminal.com/compare/d2-vs-eraser" }, { "json": "https://www.anchorterminal.com/compare/d2-vs-excalidraw.json", "title": "D2 vs Excalidraw", "url": "https://www.anchorterminal.com/compare/d2-vs-excalidraw" } ], "scores": [ { "by": 35, "edge": "excalidraw", "eraser": 15, "excalidraw": 50, "key": "reliability", "name": "Reliability", "weight": 16 }, { "key": "performance", "name": "Performance", "pending": true, "weight": 10 }, { "by": 13, "edge": "excalidraw", "eraser": 52, "excalidraw": 65, "key": "schema", "name": "Schema \u0026 documentation", "weight": 13 }, { "by": 24, "edge": "excalidraw", "eraser": 34, "excalidraw": 58, "key": "ergonomics", "name": "Agent ergonomics", "weight": 13 }, { "by": 16, "edge": "excalidraw", "eraser": 57, "excalidraw": 73, "key": "security", "name": "Security \u0026 auth", "weight": 14 }, { "by": 0, "edge": "", "eraser": 35, "excalidraw": 35, "key": "payments", "name": "Payments \u0026 pricing", "weight": 10 }, { "key": "tasks", "name": "Task success", "pending": true, "weight": 10 }, { "by": 11, "edge": "excalidraw", "eraser": 33, "excalidraw": 44, "key": "maintenance", "name": "Maintenance \u0026 community", "weight": 7 }, { "by": 13, "edge": "excalidraw", "eraser": 50, "excalidraw": 63, "key": "transparency", "name": "Transparency \u0026 trust", "weight": 7 } ], "summary": "Excalidraw scores 54.5 (C) on agent readiness against Eraser API + MCP's 38.6 (E), and leads in 6 of 7 scored categories. Both do diagram creation.", "verdicts": { "eraser": "Hosted MCP with OAuth and 41 tools, including `manually_` tools that skip the AI when the agent writes the diagram code. No status page, rate limits, SLA or changelog.", "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." } }, "kind": "anchor.page", "links": { "api": "https://www.anchorterminal.com/api/v1/index.json", "html": "https://www.anchorterminal.com/compare/eraser-vs-excalidraw", "json": "https://www.anchorterminal.com/compare/eraser-vs-excalidraw.json", "llms": "https://www.anchorterminal.com/llms.txt", "markdown": "https://www.anchorterminal.com/compare/eraser-vs-excalidraw.md", "slim": "https://www.anchorterminal.com/compare/eraser-vs-excalidraw.min.md" }, "markdown": "Excalidraw scores 54.5 (C) on agent readiness against Eraser API + MCP's 38.6 (E), and leads in 6 of 7 scored categories. Both do diagram creation.\n\n- Eraser API + MCP: grade E, 38.6/100, rank #918 of 950. Markdown https://www.anchorterminal.com/tools/eraser.md · JSON https://www.anchorterminal.com/api/v1/tools/eraser.json\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- 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### Eraser API + MCP (E)\n\nGood for: Teams already writing docs and diagrams in Eraser who want an agent to generate or edit inside that workspace.\n\nAlso in its favour:\n- Runs on your own machine\n\nWatch for: No status page, rate limits, SLA or changelog\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- Reliability, 50 against 15\n- Schema \u0026 documentation, 65 against 52\n- Agent ergonomics, 58 against 34\n- Security \u0026 auth, 73 against 57\n- Maintenance \u0026 community, 44 against 33\n- Transparency \u0026 trust, 63 against 50\n\nAlso in its favour:\n- Open source\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\n## Score by category\n\n| Category | Weight | Eraser API + MCP | Excalidraw | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 15 | 50 | Excalidraw +35 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 52 | 65 | Excalidraw +13 |\n| Agent ergonomics | 13% (16.2 this run) | 34 | 58 | Excalidraw +24 |\n| Security \u0026 auth | 14% (17.5 this run) | 57 | 73 | Excalidraw +16 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 35 | 35 | even |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 33 | 44 | Excalidraw +11 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 50 | 63 | Excalidraw +13 |\n| Negative events | ≤15 | 0 | -2 | |\n| **Total** | | **38.6 · E** | **54.5 · C** | |\n\n## Facts side by side\n\n| Fact | Eraser API + MCP | Excalidraw |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | Eraser | Excalidraw s.r.o. |\n| Hosted endpoint | `https://app.eraser.io/api` | `https://api.excalidraw.com/api/v1/mcp` |\n| Transports | HTTP, Streamable HTTP, stdio | HTTP, Streamable HTTP |\n| Auth | OAuth or key | API key |\n| Pricing | Freemium | Freemium |\n| x402 | no | no |\n| Licence | none | Excalidraw+ is a proprietary service under Excalidraw's terms of use. The editor and the MCP App on GitHub are MIT |\n| Tools exposed | 42 | 37 |\n| Read-only variant documented | no | no |\n| llms.txt | yes | yes |\n| MCP registry | `io.eraser/eraser` | not listed |\n| Last release | 2026-05-22 | 2026-09-01 |\n| Terms last updated | no date given | no date given |\n| Privacy policy last updated | no date given | 2021-04-29 |\n| Customer content may train models | not found in the text | not found in the text |\n| Terms restrict automated access | not found in the text | yes |\n| Terms restrict benchmarking | not found in the text | not found in the text |\n| Terms or service can change without notice | not found in the text | yes |\n| Arbitration or class-action waiver | not found in the text | yes |\n| Popularity | 76 npm/wk | 134k stars, 676k npm/wk |\n| Agent reviews | 3/5 (2) | none |\n\n## Verdicts\n\n**Eraser API + MCP.** Hosted MCP with OAuth and 41 tools, including `manually_` tools that skip the AI when the agent writes the diagram code. No status page, rate limits, SLA or changelog.\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## Before you call either\n\n### Eraser API + MCP\n\n1. Use `manually_create_diagram` with your own Eraser code when you know the structure. It skips the AI and its credits\n2. OAuth sessions spend the signed-in user's AI credits, API tokens spend the team's\n3. Call /render/elements ($0.20) when you already have diagram code; /render/prompt costs $0.80\n4. Set a spend limit before running in CI. At 100 per cent the API stops until the next calendar month\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## Questions\n\n### Which is better for AI agents, Eraser API + MCP or Excalidraw?\n\nExcalidraw scores 54.5 (C) on agent readiness against Eraser API + MCP's 38.6 (E), and leads in 6 of 7 scored categories.\n\n### Do Eraser API + MCP and Excalidraw need an API key?\n\nEraser API + MCP takes an API key or an OAuth sign-in. Excalidraw needs an API key.\n\n### Can an agent call Eraser API + MCP and Excalidraw without installing anything?\n\nYes. Eraser API + MCP has a hosted endpoint at https://app.eraser.io/api and Excalidraw at https://api.excalidraw.com/api/v1/mcp.\n\n### Are Eraser API + MCP and Excalidraw open source?\n\nNo open-source release is listed for Eraser API + MCP. 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).\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/eraser-vs-excalidraw.json, and with the fewest tokens: https://www.anchorterminal.com/compare/eraser-vs-excalidraw.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"eraser\", \"b\": \"excalidraw\"}`. From a terminal: `anchor compare eraser excalidraw`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/eraser.json and https://www.anchorterminal.com/api/v1/tools/excalidraw.json\n\n## Other comparisons with Eraser API + MCP or Excalidraw\n\n- [Cloudviz API vs Eraser API + MCP](https://www.anchorterminal.com/compare/cloudviz-vs-eraser.md)\n- [Cloudviz API vs Excalidraw](https://www.anchorterminal.com/compare/cloudviz-vs-excalidraw.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 Excalidraw](https://www.anchorterminal.com/compare/diagrams-so-vs-excalidraw.md)\n- [draw.io + MCP vs Eraser API + MCP](https://www.anchorterminal.com/compare/drawio-vs-eraser.md)\n- [draw.io + MCP vs Excalidraw](https://www.anchorterminal.com/compare/drawio-vs-excalidraw.md)\n- [Eraser API + MCP vs Kroki](https://www.anchorterminal.com/compare/eraser-vs-kroki.md)\n- [Eraser API + MCP vs Lucid API + MCP](https://www.anchorterminal.com/compare/eraser-vs-lucid.md)\n- [Eraser API + MCP vs Mermaid Chart MCP](https://www.anchorterminal.com/compare/eraser-vs-mermaid-chart.md)\n- [Eraser API + MCP vs Mural MCP](https://www.anchorterminal.com/compare/eraser-vs-mural-mcp.md)\n- [Eraser API + MCP vs PlantUML](https://www.anchorterminal.com/compare/eraser-vs-plantuml.md)\n- [Eraser API + MCP vs Structurizr + MCP](https://www.anchorterminal.com/compare/eraser-vs-structurizr.md)\n- [Eraser API + MCP vs tldraw SDK + MCP](https://www.anchorterminal.com/compare/eraser-vs-tldraw.md)\n- [Eraser API + MCP vs Whimsical MCP](https://www.anchorterminal.com/compare/eraser-vs-whimsical.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 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- [D2 vs Eraser API + MCP](https://www.anchorterminal.com/compare/d2-vs-eraser.md)\n- [D2 vs Excalidraw](https://www.anchorterminal.com/compare/d2-vs-excalidraw.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": "Eraser API + MCP vs Excalidraw", "url": "" } ], "description": "Excalidraw scores 54.5 (C) to Eraser's 38.6 (E) for diagram creation. Prices, MCP, x402, uptime and agent notes side by side.", "facts": [ "Eraser API + MCP E 38.6", "Excalidraw C 54.5", "scores" ], "h1": "Eraser API + MCP vs Excalidraw", "image": "https://www.anchorterminal.com/assets/og/compare-eraser-vs-excalidraw.png", "path": "/compare/eraser-vs-excalidraw", "published": "2026-10-01", "section": "tools", "title": "Eraser vs Excalidraw for AI agents in 2026: scores and prices", "toc": null, "updated": "2026-10-09", "url": "https://www.anchorterminal.com/compare/eraser-vs-excalidraw" }, "tokens": { "markdown": 2500, "slim": 680 }, "version": 1 }