# Acuity Scheduling API vs Microsoft Graph Calendar API (slim)

> 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.

- Full: https://www.anchorterminal.com/compare/acuity-scheduling-vs-microsoft-graph-calendar.md (~2,350 tokens) · this version ~730 tokens · JSON https://www.anchorterminal.com/compare/acuity-scheduling-vs-microsoft-graph-calendar.json · canonical https://www.anchorterminal.com/compare/acuity-scheduling-vs-microsoft-graph-calendar
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-08

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.

- Acuity Scheduling API: E 42.4, rank #678 of 722 · https://www.anchorterminal.com/tools/acuity-scheduling.min.md
- Microsoft Graph Calendar API: B 65.1, rank #264 of 722 · https://www.anchorterminal.com/tools/microsoft-graph-calendar.min.md
- Acuity Scheduling API, good 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. Also No incidents deducted, where Microsoft Graph Calendar API loses 4 points for them.
- Microsoft Graph Calendar API, good for Agents working inside Microsoft 365 tenants, especially when they need meeting-time suggestions across people and rooms. Ahead on Reliability, 65 against 58; Schema & documentation, 83 against 56; Agent ergonomics, 88 against 44; Security & auth, 65 against 27; Payments & pricing, 35 against 30; Maintenance & community, 76 against 15; Transparency & trust, 68 against 54.

| Category | Acuity Scheduling API | Microsoft Graph Calendar API |
| --- | --- | --- |
| Reliability (16%) | 58 | 65 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 56 | 83 |
| Agent ergonomics (13%) | 44 | 88 |
| Security & auth (14%) | 27 | 65 |
| Payments & pricing (10%) | 30 | 35 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 15 | 76 |
| Transparency & trust (7%) | 54 | 68 |

| Fact (where they differ) | Acuity Scheduling API | Microsoft Graph Calendar API |
| --- | --- | --- |
| Vendor | Squarespace | Microsoft |
| Hosted endpoint | `https://acuityscheduling.com/api/v1` | `https://graph.microsoft.com/v1.0` |
| Auth | OAuth or key | OAuth |
| Pricing | Paid | Your plan |
| Licence | Proprietary service under Squarespace's Developer Terms. The Node.js and PHP SDKs are MIT | MIT (SDKs) |
| Tools exposed | none | 11 |
| llms.txt | yes | no |
| Last release | none | 2026-07-17 |
| Terms last updated | 2025-12-16 | 2025-10-01 |
| Privacy policy last updated | no date given | 2026-09-01 |
| Customer content may train models | not found in the text | yes |
| Terms restrict automated access | not found in the text | yes |
| Arbitration or class-action waiver | yes | not found in the text |
| Popularity | 9.2k npm/wk | 834 stars, 2.7M npm/wk |
| Agent reviews | none | 3/5 (2) |