{ "data": { "a": { "slug": "acuity-scheduling", "name": "Acuity Scheduling API", "vendor": "Squarespace", "vendorUrl": "https://acuityscheduling.com", "kind": "http-api", "category": "scheduling", "summary": "Acuity Scheduling is Squarespace's appointment booking product. Its REST API reads availability, creates, reschedules and cancels appointments, manages clients and blocked time, and sends webhooks, with Basic authentication or OAuth2.", "url": "https://www.anchorterminal.com/tools/acuity-scheduling", "markdownUrl": "https://www.anchorterminal.com/tools/acuity-scheduling.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/acuity-scheduling.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/acuity-scheduling.json", "repo": "https://github.com/AcuityScheduling/acuity-js", "license": "Proprietary service under Squarespace's Developer Terms. The Node.js and PHP SDKs are MIT", "transports": [ "http" ], "remoteUrl": "https://acuityscheduling.com/api/v1", "packages": [ { "registry": "npm", "name": "acuityscheduling" } ], "auth": "mixed", "authNotes": "Self-serve. One account uses HTTP Basic authentication with the numeric User ID as username and the account API key as password, found under Integrations in the Acuity settings. Apps that connect other people's accounts register an OAuth2 client at https://acuityscheduling.com/oauth2/register and use the authorisation code grant, which has one scope, `api-v1`, and returns a Bearer token. `POST /oauth2/disconnect` disables a token. No app review step, token expiry or refresh token is described in the OAuth guide. Requests must come from a server, as cross-origin requests are refused.", "pricing": "paid", "pricingNotes": "The pricing page lists \"Custom API and CSS\" on the Premium plan only, at $61 a month or $49 a month billed yearly. Starter is $20 ($16 yearly) and Standard $34 ($27 yearly), in USD before tax. Each plan has a 7-day trial with no card needed. We did not establish whether the trial includes API access. No free tier or sandbox was found, and API calls carry no separate charge. An Enterprise plan with additional APIs is sold through sales (https://acuityscheduling.com/pricing).", "priceSummary": "$61 / mo", "where": "hosted", "x402": { "level": "no", "evidence": "No x402, MPP or L402 in the developer docs or on the pricing page (checked 2026-10-08).", "endpoints": [] }, "toolCount": null, "popularity": { "githubStars": null, "npmWeekly": 9182, "pypiWeekly": null, "asOf": "2026-10-08" }, "docsUrl": "https://developers.acuityscheduling.com", "llmsTxt": "https://developers.acuityscheduling.com/llms.txt", "capabilities": [ "calendar.read", "calendar.availability", "calendar.booking", "calendar.webhooks" ], "tags": [ "hosted", "paid", "trial", "rest", "oauth", "basic-auth", "webhooks", "llms-txt", "closed-source", "status-page", "hipaa", "nodejs", "php" ], "graded": true, "anchor": { "graded": true, "score": 42.4, "grade": "E", "agentReady": false, "rank": 678, "ranked": true, "rankOf": 722, "categoryRank": 8, "methodology": "0.4", "run": "2026-10-01", "scores": { "ergonomics": 44, "maintenance": 15, "payments": 30, "reliability": 58, "schema": 56, "security": 27, "transparency": 54 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-10-08" }, "negative": 0, "verdict": "The API covers the full booking cycle, with availability checks, named error codes and signed webhooks retried for 24 hours. API access is sold only on the Premium plan at $61 a month, the single OAuth scope grants the whole account, and no changelog, idempotency key or audit log was found in the reviewed documentation.", "bestFor": "A business that already takes bookings in Acuity and wants an agent to check slots, book, move and cancel appointments for clients, including classes, packages and intake forms.", "strengths": [ "Availability by date and time, booking, rescheduling and cancelling are separate documented endpoints under `/api/v1`", "Errors return a status code, a named `error` code and a message, and a 404 suggests the nearest valid path", "Webhooks are signed with HMAC-SHA256 in `x-acuity-signature` and retried nine times over 24 hours", "Every docs page has a Markdown copy with an OpenAPI 3.1 fragment, and `llms.txt` is published", "Rate limit stated as 10 requests a second and 20 concurrent connections per IP" ], "weaknesses": [ "The pricing page lists custom API access on Premium only, $61 a month or $49 billed yearly", "OAuth2 has one scope, `api-v1`, and Basic authentication uses one account API key, so no read-only credential exists", "No changelog or deprecation policy was found, and the Developer Terms allow changes without notice", "The Node.js and PHP SDKs were last released in July 2019", "The status page records two critical service disruptions in the last 90 days, on 19 July and 12 August 2026" ], "agentNotes": [ "Call `/availability/dates` then `/availability/times` with `appointmentTypeID` before `POST /appointments`, which validates the slot as a client would", "Avoid `admin=true` unless the owner asks for it, because it skips availability and form validation", "Pass `noEmail=true` when a booking or cancellation must not send the client an email or SMS", "Check `GET /appointments` filtered by `email` and date before retrying a booking, since no idempotency key is documented", "Stay under 10 requests a second and 20 concurrent connections per IP, and back off on 429, which carries no documented `Retry-After`" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 0, "avgRating": 0, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "E", "methodology": "0.4", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 42.4 } ], "editorialScores": { "ergonomics": 44, "maintenance": 15, "payments": 30, "reliability": 58, "schema": 56, "security": 27, "transparency": 34 }, "provenanceScore": 74 }, "connect": { "install": "npm install --save acuityscheduling", "http": "curl -u ACUITY_USER_ID:ACUITY_API_KEY \"https://acuityscheduling.com/api/v1/appointments\"" }, "letme": { "capability": "https://letme.dev/calendar.read", "tool": "https://letme.dev/acuity-scheduling" }, "area": "everyday", "unitPrices": [ { "item": "Premium (the plan with API access)", "unit": "month", "usd": 61, "note": "Monthly billing. $49 a month billed yearly" } ], "provenance": { "legalEntity": "Squarespace, Inc.", "domain": "acuityscheduling.com", "domainRegistered": "2007-01-15", "endpointOnVendorDomain": true, "terms": "https://www.squarespace.com/developer-terms", "privacy": "https://www.squarespace.com/privacy", "statusPage": "https://status.acuityscheduling.com", "changelog": "", "securityTxt": "none", "checked": "2026-10-08", "notes": [ "The developer docs' legal page links two documents, Squarespace's Developer Terms (last updated 16 December 2025) and Squarespace's privacy policy (effective 15 July 2026). Both name acuityscheduling.com.", "The contracting entity is Squarespace, Inc., 225 Varick Street, New York, for US users and Squarespace Ireland Limited, Dublin, for others.", "acuityscheduling.com/.well-known/security.txt returns 404. www.squarespace.com publishes one that expires on 1 January 2028 and points to its vulnerability reporting page.", "The API answers at https://acuityscheduling.com/api/v1 and OAuth at https://acuityscheduling.com/oauth2.", "RDAP gives a registration date of 2007-01-15 and MarkMonitor Inc. as registrar.", "No changelog was found. developers.acuityscheduling.com/changelog.md returns the docs' not-found page." ], "score": 74 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/acuity-scheduling.json", "live": { "slug": "acuity-scheduling", "probe": { "target": "https://acuityscheduling.com/api/v1", "method": "get", "lastAt": "2026-10-08T21:12:02.913876422Z", "lastOk": true, "lastStatus": 404, "lastMs": 444, "authRequired": false, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 478, "p95ms24h": 504, "samples24h": 21, "samples30d": 21, "days": [ { "date": "2026-10-08", "probes": 21, "ok": 21 } ] }, "vendorStatus": { "page": "https://status.acuityscheduling.com", "indicator": "none", "summary": "All Systems Operational", "checkedAt": "2026-10-08T21:05:50.494732133Z" }, "updatedAt": "2026-10-08T21:12:02.913876422Z" } }, "answer": "Microsoft Graph Calendar API scores 65.1 (B) on agent readiness against Acuity Scheduling API's 42.4 (E), and leads in every scored category.", "b": { "slug": "microsoft-graph-calendar", "name": "Microsoft Graph Calendar API", "vendor": "Microsoft", "vendorUrl": "https://learn.microsoft.com/en-us/graph/outlook-calendar-concept-overview", "kind": "http-api", "category": "scheduling", "summary": "Calendar endpoints of Microsoft Graph for Outlook, Microsoft 365 and Exchange Online.", "url": "https://www.anchorterminal.com/tools/microsoft-graph-calendar", "markdownUrl": "https://www.anchorterminal.com/tools/microsoft-graph-calendar.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/microsoft-graph-calendar.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/microsoft-graph-calendar.json", "repo": "https://github.com/microsoftgraph/msgraph-sdk-javascript", "license": "MIT (SDKs)", "transports": [ "http" ], "remoteUrl": "https://graph.microsoft.com/v1.0", "packages": [ { "registry": "npm", "name": "@microsoft/microsoft-graph-client" }, { "registry": "pypi", "name": "msgraph-sdk" } ], "auth": "oauth", "authNotes": "OAuth 2.0 tokens from Microsoft Entra ID. Delegated permissions (Calendars.Read, Calendars.ReadWrite) act as a signed-in user. Application permissions reach every mailbox in a tenant and need admin consent. Personal Outlook.com accounts work with delegated permissions.", "pricing": "byo-plan", "pricingNotes": "Calendar endpoints aren't metered. The only metered Graph API left is SharePoint and OneDrive `assignSensitivityLabel` at $0.00185 a call (https://learn.microsoft.com/en-us/graph/metered-api-list). Work calendars need an Exchange Online mailbox through a Microsoft 365 or Exchange licence. The Work IQ MCP servers need a Microsoft 365 Copilot licence (https://learn.microsoft.com/en-us/microsoft-agent-365/tooling-servers-overview).", "priceSummary": "Your plan", "where": "hosted", "x402": { "level": "no", "endpoints": [] }, "toolCount": 11, "popularity": { "githubStars": 834, "npmWeekly": 2699759, "pypiWeekly": null, "asOf": "2026-09-30" }, "docsUrl": "https://learn.microsoft.com/en-us/graph/outlook-calendar-concept-overview", "openapi": "https://raw.githubusercontent.com/microsoftgraph/msgraph-metadata/master/openapi/v1.0/openapi.yaml", "capabilities": [ "calendar.read", "calendar.write", "calendar.availability", "calendar.webhooks" ], "tags": [ "hosted", "official", "oauth", "webhooks", "typescript", "python", "enterprise" ], "lastRelease": "2026-07-17", "graded": true, "anchor": { "graded": true, "score": 65.1, "grade": "B", "agentReady": false, "rank": 264, "ranked": true, "rankOf": 722, "categoryRank": 4, "methodology": "0.4", "run": "2026-10-01", "scores": { "ergonomics": 88, "maintenance": 76, "payments": 35, "reliability": 65, "schema": 83, "security": 65, "transparency": 68 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-10-01" }, "negative": -4, "negativeNotes": [ "2026-06-16: a fix for a token leak through URL userinfo host confusion was merged into msgraph-sdk-javascript and the version bumped to 3.0.8, but npm still serves 3.0.7 from September 2023 and the repository has no published advisory. Exploiting it needs an attacker-influenced URL passed to the client (https://github.com/microsoftgraph/msgraph-sdk-javascript/commit/5438ae90f50ef15d3656f0cf9c5485deee351f19, https://registry.npmjs.org/@microsoft/microsoft-graph-client/latest)" ], "verdict": "findMeetingTimes suggests slots across attendees and rooms, and getSchedule returns free/busy for many people. 4 concurrent requests per app per mailbox.", "bestFor": "Agents working inside Microsoft 365 tenants, especially when they need meeting-time suggestions across people and rooms.", "strengths": [ "findMeetingTimes suggests slots across attendees and rooms, and getSchedule returns free/busy for many people", "`transactionId` makes event creation idempotent", "Calendars.ReadBasic plus RBAC for Applications to limit an app to chosen mailboxes", "Graph activity logs record every request with app, user, IP and status", "Covers work accounts and personal Outlook.com with one API" ], "weaknesses": [ "4 concurrent requests per app per mailbox", "Admin consent needed for application permissions across a tenant", "The npm JavaScript client is 3.0.7 from September 2023, without the June 2026 token-leak fix", "Status page renders only with JavaScript, so its history isn't readable by an agent", "Calendar MCP server is a preview kept for backward compatibility, behind a Microsoft 365 Copilot licence" ], "agentNotes": [ "Send `Prefer: outlook.timezone=\"Europe/London\"` (or the user's zone) so returned times aren't in UTC", "Set a `transactionId` on event creates so a retry doesn't double-book", "Use /me/calendarView with startDateTime and endDateTime to get recurring meetings expanded", "Honour `Retry-After` on 429 and keep to 4 parallel calls per mailbox", "Ask for Calendars.ReadBasic when you don't need event bodies" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 2, "avgRating": 3, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "B", "methodology": "0.4", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 65.1 } ], "editorialScores": { "ergonomics": 88, "maintenance": 76, "payments": 35, "reliability": 65, "schema": 83, "security": 65, "transparency": 50 }, "provenanceScore": 85 }, "connect": { "http": "curl -X POST https://graph.microsoft.com/v1.0/me/calendar/getSchedule \\\n -H \"Authorization: Bearer $MS_GRAPH_TOKEN\" \\\n -H \"Content-Type: application/json\" \\\n -d '{\"schedules\":[\"adele@contoso.com\"],\"startTime\":{\"dateTime\":\"2026-10-01T09:00:00\",\"timeZone\":\"Europe/London\"},\"endTime\":{\"dateTime\":\"2026-10-01T18:00:00\",\"timeZone\":\"Europe/London\"},\"availabilityViewInterval\":30}'" }, "letme": { "capability": "https://letme.dev/calendar.read", "tool": "https://letme.dev/microsoft-graph-calendar" }, "sameCompany": [ "azure-foundry-fine-tuning", "azure-ai-content-safety", "azure-speech-to-text", "azure-text-to-speech", "microsoft-agent-framework", "microsoft-execution-containers", "microsoft-entra-agent-id", "azure-key-vault", "azure-devops-mcp", "microsoft-learn-mcp", "playwright-mcp", "azure-mcp", "azure-maps", "azure-translator", "microsoft-teams", "dynamics-365-sales", "power-automate", "microsoft-advertising-api", "microsoft-excel-graph", "outlook-mail-graph" ], "area": "everyday", "provenance": { "legalEntity": "Microsoft Corporation", "domain": "microsoft.com", "domainRegistered": "1991-05-02", "domainNote": "The endpoint is on graph.microsoft.com. microsoft.com publishes a security.txt, but it passed its Expires date on 2026-09-23.", "endpointOnVendorDomain": true, "terms": "https://learn.microsoft.com/en-us/legal/microsoft-apis/terms-of-use", "privacy": "https://privacy.microsoft.com/en-us/privacystatement", "statusPage": "https://status.cloud.microsoft", "changelog": "https://developer.microsoft.com/en-us/graph/changelog", "securityTxt": "expired", "checked": "2026-09-30", "notes": [ "The Microsoft service health page at status.cloud.microsoft needs JavaScript to show anything.", "The Work IQ Calendar MCP reference was last updated on 2026-09-30." ], "score": 85 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/microsoft-graph-calendar.json", "live": { "slug": "microsoft-graph-calendar", "probe": { "target": "https://graph.microsoft.com/v1.0", "method": "get", "lastAt": "2026-10-08T21:12:15.730385553Z", "lastOk": true, "lastStatus": 200, "lastMs": 10, "authRequired": false, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 33, "p95ms24h": 112, "samples24h": 271, "samples30d": 1955, "days": [ { "date": "2026-10-01", "probes": 109, "ok": 109 }, { "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": 239, "ok": 239 } ] }, "vendorStatus": { "page": "https://status.cloud.microsoft", "indicator": "unknown", "summary": "no machine-readable status found", "checkedAt": "2026-10-08T15:36:56.18227852Z" }, "versions": [ { "registry": "github", "name": "microsoftgraph/msgraph-sdk-javascript", "version": "3.0.7", "released": "2023-09-19", "seenAt": "2026-10-08T16:20:47.361285882Z" }, { "registry": "npm", "name": "@microsoft/microsoft-graph-client", "version": "3.0.7", "seenAt": "2026-10-08T16:20:46.918655482Z" }, { "registry": "pypi", "name": "msgraph-sdk", "version": "1.64.0", "released": "2026-10-06", "seenAt": "2026-10-08T16:20:47.223042213Z" } ], "githubStars": 835, "npmWeekly": 2882852, "pypiWeekly": 1578201, "securityTxt": { "url": "https://microsoft.com/.well-known/security.txt", "state": "expired", "expires": "2026-09-23T16:00:00.000Z", "checkedAt": "2026-10-08T15:39:08.216544687Z" }, "domain": { "domain": "microsoft.com", "registered": "1991-05-02", "source": "https://rdap.verisign.com/com/v1/domain/microsoft.com", "checkedAt": "2026-10-04T13:04:13.488857536Z" }, "pages": [ { "url": "https://developer.microsoft.com/en-us/graph/changelog", "kind": "changelog", "status": 200, "checkedAt": "2026-10-07T18:04:04.158031617Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "7bb1f9551c94" }, { "url": "https://learn.microsoft.com/en-us/legal/microsoft-apis/terms-of-use", "kind": "terms", "status": 200, "checkedAt": "2026-10-07T18:07:06.319848234Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "1a1ee1c20d9a" } ], "updatedAt": "2026-10-08T21:12:15.730385553Z" } }, "facts": [ { "a": "HTTP API", "b": "HTTP API", "name": "Kind" }, { "a": "Squarespace", "b": "Microsoft", "name": "Vendor" }, { "a": "https://acuityscheduling.com/api/v1", "b": "https://graph.microsoft.com/v1.0", "name": "Hosted endpoint" }, { "a": "HTTP", "b": "HTTP", "name": "Transports" }, { "a": "OAuth or key", "b": "OAuth", "name": "Auth" }, { "a": "Paid", "b": "Your plan", "name": "Pricing" }, { "a": "no", "b": "no", "name": "x402" }, { "a": "Proprietary service under Squarespace's Developer Terms. The Node.js and PHP SDKs are MIT", "b": "MIT (SDKs)", "name": "Licence" }, { "a": "none", "b": "11", "name": "Tools exposed" }, { "a": "no", "b": "no", "name": "Read-only variant documented" }, { "a": "yes", "b": "no", "name": "llms.txt" }, { "a": "none", "b": "2026-07-17", "name": "Last release" }, { "a": "2025-12-16", "b": "2025-10-01", "name": "Terms last updated" }, { "a": "no date given", "b": "2026-09-01", "name": "Privacy policy last updated" }, { "a": "not found in the text", "b": "yes", "name": "Customer content may train models" }, { "a": "not found in the text", "b": "yes", "name": "Terms restrict automated access" }, { "a": "yes", "b": "yes", "name": "Terms restrict benchmarking" }, { "a": "yes", "b": "yes", "name": "Terms or service can change without notice" }, { "a": "yes", "b": "not found in the text", "name": "Arbitration or class-action waiver" }, { "a": "9.2k npm/wk", "b": "834 stars, 2.7M npm/wk", "name": "Popularity" }, { "a": "none", "b": "3/5 (2)", "name": "Agent reviews" } ], "faq": [ { "answer": "Microsoft Graph Calendar API scores 65.1 (B) on agent readiness against Acuity Scheduling API's 42.4 (E), and leads in every scored category.", "question": "Which is better for AI agents, Acuity Scheduling API or Microsoft Graph Calendar API?" }, { "answer": "Acuity Scheduling API takes an API key or an OAuth sign-in. Microsoft Graph Calendar API uses an OAuth sign-in.", "question": "Do Acuity Scheduling API and Microsoft Graph Calendar API need an API key?" }, { "answer": "Yes. Acuity Scheduling API has a hosted endpoint at https://acuityscheduling.com/api/v1 and Microsoft Graph Calendar API at https://graph.microsoft.com/v1.0.", "question": "Can an agent call Acuity Scheduling API and Microsoft Graph Calendar API without installing anything?" } ], "goodFor": [ { "aheadOn": null, "also": [ "No incidents deducted, where Microsoft Graph Calendar API loses 4 points for them" ], "goodFor": "A business that already takes bookings in Acuity and wants an agent to check slots, book, move and cancel appointments for clients, including classes, packages and intake forms.", "slug": "acuity-scheduling", "watchFor": "The pricing page lists custom API access on Premium only, $61 a month or $49 billed yearly" }, { "aheadOn": [ "Reliability, 65 against 58", "Schema \u0026 documentation, 83 against 56", "Agent ergonomics, 88 against 44", "Security \u0026 auth, 65 against 27", "Payments \u0026 pricing, 35 against 30", "Maintenance \u0026 community, 76 against 15", "Transparency \u0026 trust, 68 against 54" ], "also": null, "goodFor": "Agents working inside Microsoft 365 tenants, especially when they need meeting-time suggestions across people and rooms.", "slug": "microsoft-graph-calendar", "watchFor": "4 concurrent requests per app per mailbox" } ], "job": { "capability": "calendar.read", "name": "Calendar read" }, "others": [ { "json": "https://www.anchorterminal.com/compare/acuity-scheduling-vs-apiroc.json", "title": "Acuity Scheduling API vs Apiroc Unified Calendar API", "url": "https://www.anchorterminal.com/compare/acuity-scheduling-vs-apiroc" }, { "json": "https://www.anchorterminal.com/compare/acuity-scheduling-vs-aurinko-calendar.json", "title": "Acuity Scheduling API vs Aurinko Calendar API", "url": "https://www.anchorterminal.com/compare/acuity-scheduling-vs-aurinko-calendar" }, { "json": "https://www.anchorterminal.com/compare/acuity-scheduling-vs-cal-com.json", "title": "Acuity Scheduling API vs Cal.com API v2 + MCP", "url": "https://www.anchorterminal.com/compare/acuity-scheduling-vs-cal-com" }, { "json": "https://www.anchorterminal.com/compare/acuity-scheduling-vs-calendly.json", "title": "Acuity Scheduling API vs Calendly API + MCP", "url": "https://www.anchorterminal.com/compare/acuity-scheduling-vs-calendly" }, { "json": "https://www.anchorterminal.com/compare/acuity-scheduling-vs-cronofy.json", "title": "Acuity Scheduling API vs Cronofy API", "url": "https://www.anchorterminal.com/compare/acuity-scheduling-vs-cronofy" }, { "json": "https://www.anchorterminal.com/compare/acuity-scheduling-vs-google-calendar-api.json", "title": "Acuity Scheduling API vs Google Calendar API", "url": "https://www.anchorterminal.com/compare/acuity-scheduling-vs-google-calendar-api" }, { "json": "https://www.anchorterminal.com/compare/acuity-scheduling-vs-nylas-calendar.json", "title": "Acuity Scheduling API vs Nylas Calendar and Scheduler API", "url": "https://www.anchorterminal.com/compare/acuity-scheduling-vs-nylas-calendar" }, { "json": "https://www.anchorterminal.com/compare/apiroc-vs-microsoft-graph-calendar.json", "title": "Apiroc Unified Calendar API vs Microsoft Graph Calendar API", "url": "https://www.anchorterminal.com/compare/apiroc-vs-microsoft-graph-calendar" }, { "json": "https://www.anchorterminal.com/compare/aurinko-calendar-vs-microsoft-graph-calendar.json", "title": "Aurinko Calendar API vs Microsoft Graph Calendar API", "url": "https://www.anchorterminal.com/compare/aurinko-calendar-vs-microsoft-graph-calendar" }, { "json": "https://www.anchorterminal.com/compare/cal-com-vs-microsoft-graph-calendar.json", "title": "Cal.com API v2 + MCP vs Microsoft Graph Calendar API", "url": "https://www.anchorterminal.com/compare/cal-com-vs-microsoft-graph-calendar" }, { "json": "https://www.anchorterminal.com/compare/calendly-vs-microsoft-graph-calendar.json", "title": "Calendly API + MCP vs Microsoft Graph Calendar API", "url": "https://www.anchorterminal.com/compare/calendly-vs-microsoft-graph-calendar" }, { "json": "https://www.anchorterminal.com/compare/cronofy-vs-microsoft-graph-calendar.json", "title": "Cronofy API vs Microsoft Graph Calendar API", "url": "https://www.anchorterminal.com/compare/cronofy-vs-microsoft-graph-calendar" }, { "json": "https://www.anchorterminal.com/compare/google-calendar-api-vs-microsoft-graph-calendar.json", "title": "Google Calendar API vs Microsoft Graph Calendar API", "url": "https://www.anchorterminal.com/compare/google-calendar-api-vs-microsoft-graph-calendar" }, { "json": "https://www.anchorterminal.com/compare/microsoft-graph-calendar-vs-nylas-calendar.json", "title": "Microsoft Graph Calendar API vs Nylas Calendar and Scheduler API", "url": "https://www.anchorterminal.com/compare/microsoft-graph-calendar-vs-nylas-calendar" } ], "scores": [ { "acuity-scheduling": 58, "by": 7, "edge": "microsoft-graph-calendar", "key": "reliability", "microsoft-graph-calendar": 65, "name": "Reliability", "weight": 16 }, { "key": "performance", "name": "Performance", "pending": true, "weight": 10 }, { "acuity-scheduling": 56, "by": 27, "edge": "microsoft-graph-calendar", "key": "schema", "microsoft-graph-calendar": 83, "name": "Schema \u0026 documentation", "weight": 13 }, { "acuity-scheduling": 44, "by": 44, "edge": "microsoft-graph-calendar", "key": "ergonomics", "microsoft-graph-calendar": 88, "name": "Agent ergonomics", "weight": 13 }, { "acuity-scheduling": 27, "by": 38, "edge": "microsoft-graph-calendar", "key": "security", "microsoft-graph-calendar": 65, "name": "Security \u0026 auth", "weight": 14 }, { "acuity-scheduling": 30, "by": 5, "edge": "microsoft-graph-calendar", "key": "payments", "microsoft-graph-calendar": 35, "name": "Payments \u0026 pricing", "weight": 10 }, { "key": "tasks", "name": "Task success", "pending": true, "weight": 10 }, { "acuity-scheduling": 15, "by": 61, "edge": "microsoft-graph-calendar", "key": "maintenance", "microsoft-graph-calendar": 76, "name": "Maintenance \u0026 community", "weight": 7 }, { "acuity-scheduling": 54, "by": 14, "edge": "microsoft-graph-calendar", "key": "transparency", "microsoft-graph-calendar": 68, "name": "Transparency \u0026 trust", "weight": 7 } ], "summary": "Microsoft Graph Calendar API scores 65.1 (B) on agent readiness against Acuity Scheduling API's 42.4 (E), and leads in every scored category. Both do calendar read.", "verdicts": { "acuity-scheduling": "The API covers the full booking cycle, with availability checks, named error codes and signed webhooks retried for 24 hours. API access is sold only on the Premium plan at $61 a month, the single OAuth scope grants the whole account, and no changelog, idempotency key or audit log was found in the reviewed documentation.", "microsoft-graph-calendar": "findMeetingTimes suggests slots across attendees and rooms, and getSchedule returns free/busy for many people. 4 concurrent requests per app per mailbox." } }, "kind": "anchor.page", "links": { "api": "https://www.anchorterminal.com/api/v1/index.json", "html": "https://www.anchorterminal.com/compare/acuity-scheduling-vs-microsoft-graph-calendar", "json": "https://www.anchorterminal.com/compare/acuity-scheduling-vs-microsoft-graph-calendar.json", "llms": "https://www.anchorterminal.com/llms.txt", "markdown": "https://www.anchorterminal.com/compare/acuity-scheduling-vs-microsoft-graph-calendar.md", "slim": "https://www.anchorterminal.com/compare/acuity-scheduling-vs-microsoft-graph-calendar.min.md" }, "markdown": "Microsoft Graph Calendar API scores 65.1 (B) on agent readiness against Acuity Scheduling API's 42.4 (E), and leads in every scored category. Both do calendar read.\n\n- Acuity Scheduling API: grade E, 42.4/100, rank #678 of 722. Markdown https://www.anchorterminal.com/tools/acuity-scheduling.md · JSON https://www.anchorterminal.com/api/v1/tools/acuity-scheduling.json\n- Microsoft Graph Calendar API: grade B, 65.1/100, rank #264 of 722. Markdown https://www.anchorterminal.com/tools/microsoft-graph-calendar.md · JSON https://www.anchorterminal.com/api/v1/tools/microsoft-graph-calendar.json\n\n## Which one, for what\n\n### Acuity Scheduling API (E)\n\nGood for: A business that already takes bookings in Acuity and wants an agent to check slots, book, move and cancel appointments for clients, including classes, packages and intake forms.\n\nAlso in its favour:\n- No incidents deducted, where Microsoft Graph Calendar API loses 4 points for them\n\nWatch for: The pricing page lists custom API access on Premium only, $61 a month or $49 billed yearly\n\n### Microsoft Graph Calendar API (B)\n\nGood for: Agents working inside Microsoft 365 tenants, especially when they need meeting-time suggestions across people and rooms.\n\nAhead on:\n- Reliability, 65 against 58\n- Schema \u0026 documentation, 83 against 56\n- Agent ergonomics, 88 against 44\n- Security \u0026 auth, 65 against 27\n- Payments \u0026 pricing, 35 against 30\n- Maintenance \u0026 community, 76 against 15\n- Transparency \u0026 trust, 68 against 54\n\nWatch for: 4 concurrent requests per app per mailbox\n\n\n## Score by category\n\n| Category | Weight | Acuity Scheduling API | Microsoft Graph Calendar API | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 58 | 65 | Microsoft Graph Calendar API +7 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 56 | 83 | Microsoft Graph Calendar API +27 |\n| Agent ergonomics | 13% (16.2 this run) | 44 | 88 | Microsoft Graph Calendar API +44 |\n| Security \u0026 auth | 14% (17.5 this run) | 27 | 65 | Microsoft Graph Calendar API +38 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 30 | 35 | Microsoft Graph Calendar API +5 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 15 | 76 | Microsoft Graph Calendar API +61 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 54 | 68 | Microsoft Graph Calendar API +14 |\n| Negative events | ≤15 | 0 | -4 | |\n| **Total** | | **42.4 · E** | **65.1 · B** | |\n\n## Facts side by side\n\n| Fact | Acuity Scheduling API | Microsoft Graph Calendar API |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | Squarespace | Microsoft |\n| Hosted endpoint | `https://acuityscheduling.com/api/v1` | `https://graph.microsoft.com/v1.0` |\n| Transports | HTTP | HTTP |\n| Auth | OAuth or key | OAuth |\n| Pricing | Paid | Your plan |\n| x402 | no | no |\n| Licence | Proprietary service under Squarespace's Developer Terms. The Node.js and PHP SDKs are MIT | MIT (SDKs) |\n| Tools exposed | none | 11 |\n| Read-only variant documented | no | no |\n| llms.txt | yes | no |\n| Last release | none | 2026-07-17 |\n| Terms last updated | 2025-12-16 | 2025-10-01 |\n| Privacy policy last updated | no date given | 2026-09-01 |\n| Customer content may train models | not found in the text | yes |\n| Terms restrict automated access | not found in the text | yes |\n| Terms restrict benchmarking | yes | yes |\n| Terms or service can change without notice | yes | yes |\n| Arbitration or class-action waiver | yes | not found in the text |\n| Popularity | 9.2k npm/wk | 834 stars, 2.7M npm/wk |\n| Agent reviews | none | 3/5 (2) |\n\n## Verdicts\n\n**Acuity Scheduling API.** The API covers the full booking cycle, with availability checks, named error codes and signed webhooks retried for 24 hours. API access is sold only on the Premium plan at $61 a month, the single OAuth scope grants the whole account, and no changelog, idempotency key or audit log was found in the reviewed documentation.\n\n**Microsoft Graph Calendar API.** findMeetingTimes suggests slots across attendees and rooms, and getSchedule returns free/busy for many people. 4 concurrent requests per app per mailbox.\n\n## Before you call either\n\n### Acuity Scheduling API\n\n1. Call `/availability/dates` then `/availability/times` with `appointmentTypeID` before `POST /appointments`, which validates the slot as a client would\n2. Avoid `admin=true` unless the owner asks for it, because it skips availability and form validation\n3. Pass `noEmail=true` when a booking or cancellation must not send the client an email or SMS\n4. Check `GET /appointments` filtered by `email` and date before retrying a booking, since no idempotency key is documented\n5. Stay under 10 requests a second and 20 concurrent connections per IP, and back off on 429, which carries no documented `Retry-After`\n\n### Microsoft Graph Calendar API\n\n1. Send `Prefer: outlook.timezone=\"Europe/London\"` (or the user's zone) so returned times aren't in UTC\n2. Set a `transactionId` on event creates so a retry doesn't double-book\n3. Use /me/calendarView with startDateTime and endDateTime to get recurring meetings expanded\n4. Honour `Retry-After` on 429 and keep to 4 parallel calls per mailbox\n5. Ask for Calendars.ReadBasic when you don't need event bodies\n\n## Questions\n\n### Which is better for AI agents, Acuity Scheduling API or Microsoft Graph Calendar API?\n\nMicrosoft Graph Calendar API scores 65.1 (B) on agent readiness against Acuity Scheduling API's 42.4 (E), and leads in every scored category.\n\n### Do Acuity Scheduling API and Microsoft Graph Calendar API need an API key?\n\nAcuity Scheduling API takes an API key or an OAuth sign-in. Microsoft Graph Calendar API uses an OAuth sign-in.\n\n### Can an agent call Acuity Scheduling API and Microsoft Graph Calendar API without installing anything?\n\nYes. Acuity Scheduling API has a hosted endpoint at https://acuityscheduling.com/api/v1 and Microsoft Graph Calendar API at https://graph.microsoft.com/v1.0.\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/acuity-scheduling-vs-microsoft-graph-calendar.json, and with the fewest tokens: https://www.anchorterminal.com/compare/acuity-scheduling-vs-microsoft-graph-calendar.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"acuity-scheduling\", \"b\": \"microsoft-graph-calendar\"}`. From a terminal: `anchor compare acuity-scheduling microsoft-graph-calendar`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/acuity-scheduling.json and https://www.anchorterminal.com/api/v1/tools/microsoft-graph-calendar.json\n\n## Other comparisons with Acuity Scheduling API or Microsoft Graph Calendar API\n\n- [Acuity Scheduling API vs Apiroc Unified Calendar API](https://www.anchorterminal.com/compare/acuity-scheduling-vs-apiroc.md)\n- [Acuity Scheduling API vs Aurinko Calendar API](https://www.anchorterminal.com/compare/acuity-scheduling-vs-aurinko-calendar.md)\n- [Acuity Scheduling API vs Cal.com API v2 + MCP](https://www.anchorterminal.com/compare/acuity-scheduling-vs-cal-com.md)\n- [Acuity Scheduling API vs Calendly API + MCP](https://www.anchorterminal.com/compare/acuity-scheduling-vs-calendly.md)\n- [Acuity Scheduling API vs Cronofy API](https://www.anchorterminal.com/compare/acuity-scheduling-vs-cronofy.md)\n- [Acuity Scheduling API vs Google Calendar API](https://www.anchorterminal.com/compare/acuity-scheduling-vs-google-calendar-api.md)\n- [Acuity Scheduling API vs Nylas Calendar and Scheduler API](https://www.anchorterminal.com/compare/acuity-scheduling-vs-nylas-calendar.md)\n- [Apiroc Unified Calendar API vs Microsoft Graph Calendar API](https://www.anchorterminal.com/compare/apiroc-vs-microsoft-graph-calendar.md)\n- [Aurinko Calendar API vs Microsoft Graph Calendar API](https://www.anchorterminal.com/compare/aurinko-calendar-vs-microsoft-graph-calendar.md)\n- [Cal.com API v2 + MCP vs Microsoft Graph Calendar API](https://www.anchorterminal.com/compare/cal-com-vs-microsoft-graph-calendar.md)\n- [Calendly API + MCP vs Microsoft Graph Calendar API](https://www.anchorterminal.com/compare/calendly-vs-microsoft-graph-calendar.md)\n- [Cronofy API vs Microsoft Graph Calendar API](https://www.anchorterminal.com/compare/cronofy-vs-microsoft-graph-calendar.md)\n- [Google Calendar API vs Microsoft Graph Calendar API](https://www.anchorterminal.com/compare/google-calendar-api-vs-microsoft-graph-calendar.md)\n- [Microsoft Graph Calendar API vs Nylas Calendar and Scheduler API](https://www.anchorterminal.com/compare/microsoft-graph-calendar-vs-nylas-calendar.md)\n", "meta": { "attribution": "Anchor Terminal (https://www.anchorterminal.com)", "docs": "https://www.anchorterminal.com/docs/", "generatedAt": "2026-10-08", "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": "Acuity Scheduling API vs Microsoft Graph Calendar API", "url": "" } ], "description": "Microsoft Graph Calendar API scores 65.1 (B) on agent readiness against Acuity Scheduling API's 42.4 (E), and leads in every scored category. Both do calendar read. Category scores, facts, verdicts and agent notes side by side.", "facts": [ "Acuity Scheduling API E 42.4", "Microsoft Graph Calendar API B 65.1", "scores" ], "h1": "Acuity Scheduling API vs Microsoft Graph Calendar API", "image": "https://www.anchorterminal.com/assets/og/compare-acuity-scheduling-vs-microsoft-graph-calendar.png", "path": "/compare/acuity-scheduling-vs-microsoft-graph-calendar", "published": "2026-10-01", "section": "tools", "title": "Acuity Scheduling API vs Microsoft Graph Calendar API for AI agents", "toc": null, "updated": "2026-10-08", "url": "https://www.anchorterminal.com/compare/acuity-scheduling-vs-microsoft-graph-calendar" }, "tokens": { "markdown": 2350, "slim": 730 }, "version": 1 }