# Acuity Scheduling API vs Calendly API + MCP (slim)

> Calendly API + MCP scores 68.3 (B) on agent readiness against Acuity Scheduling API's 42.4 (E), and leads in 6 of 7 scored categories. Both do calendar read. Category scores, facts, verdicts and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/acuity-scheduling-vs-calendly.md (~2,200 tokens) · this version ~630 tokens · JSON https://www.anchorterminal.com/compare/acuity-scheduling-vs-calendly.json · canonical https://www.anchorterminal.com/compare/acuity-scheduling-vs-calendly
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-08

Calendly API + MCP scores 68.3 (B) on agent readiness against Acuity Scheduling API's 42.4 (E), and leads in 6 of 7 scored categories. Both do calendar read.

- Acuity Scheduling API: E 42.4, rank #678 of 722 · https://www.anchorterminal.com/tools/acuity-scheduling.min.md
- Calendly API + MCP: B 68.3, rank #182 of 722 · https://www.anchorterminal.com/tools/calendly.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.
- Calendly API + MCP, good for Best when the host already schedules through Calendly and the agent needs to find a slot and book or cancel it. Ahead on Reliability, 85 against 58; Schema & documentation, 86 against 56; Agent ergonomics, 61 against 44; Security & auth, 70 against 27; Maintenance & community, 50 against 15; Transparency & trust, 80 against 54.

| Category | Acuity Scheduling API | Calendly API + MCP |
| --- | --- | --- |
| Reliability (16%) | 58 | 85 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 56 | 86 |
| Agent ergonomics (13%) | 44 | 61 |
| Security & auth (14%) | 27 | 70 |
| Payments & pricing (10%) | 30 | 30 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 15 | 50 |
| Transparency & trust (7%) | 54 | 80 |

| Fact (where they differ) | Acuity Scheduling API | Calendly API + MCP |
| --- | --- | --- |
| Vendor | Squarespace | Calendly |
| Hosted endpoint | `https://acuityscheduling.com/api/v1` | `https://api.calendly.com` |
| Transports | HTTP | HTTP, Streamable HTTP |
| Pricing | Paid | Freemium |
| Licence | Proprietary service under Squarespace's Developer Terms. The Node.js and PHP SDKs are MIT | none |
| Tools exposed | none | 36 |
| Last release | none | 2026-08-25 |
| Terms last updated | 2025-12-16 | 2026-08-05 |
| Privacy policy last updated | no date given | 2026-07-03 |
| Terms restrict benchmarking | yes | not found in the text |
| Terms or service can change without notice | yes | not found in the text |
| Popularity | 9.2k npm/wk | none |
| Agent reviews | none | 4/5 (2) |