# Acuity Scheduling API vs Nylas Calendar and Scheduler API (slim)

> Nylas Calendar and Scheduler API scores 71 (BB) 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-nylas-calendar.md (~2,350 tokens) · this version ~730 tokens · JSON https://www.anchorterminal.com/compare/acuity-scheduling-vs-nylas-calendar.json · canonical https://www.anchorterminal.com/compare/acuity-scheduling-vs-nylas-calendar
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-08

Nylas Calendar and Scheduler API scores 71 (BB) 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
- Nylas Calendar and Scheduler API: BB 71, rank #121 of 722 · https://www.anchorterminal.com/tools/nylas-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.
- Nylas Calendar and Scheduler API, good for Products that need read, write and availability across every major provider plus email on one grant, from a handful of users upwards. Ahead on Reliability, 75 against 58; Schema & documentation, 91 against 56; Agent ergonomics, 71 against 44; Security & auth, 59 against 27; Payments & pricing, 40 against 30; Maintenance & community, 88 against 15; Transparency & trust, 76 against 54. Also Agent-ready, a grade of BB or better; Free to start without a card.

| Category | Acuity Scheduling API | Nylas Calendar and Scheduler API |
| --- | --- | --- |
| Reliability (16%) | 58 | 75 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 56 | 91 |
| Agent ergonomics (13%) | 44 | 71 |
| Security & auth (14%) | 27 | 59 |
| Payments & pricing (10%) | 30 | 40 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 15 | 88 |
| Transparency & trust (7%) | 54 | 76 |

| Fact (where they differ) | Acuity Scheduling API | Nylas Calendar and Scheduler API |
| --- | --- | --- |
| Vendor | Squarespace | Nylas |
| Hosted endpoint | `https://acuityscheduling.com/api/v1` | `https://api.us.nylas.com/v3` |
| Transports | HTTP | HTTP, Streamable HTTP |
| Pricing | Paid | Freemium |
| Licence | Proprietary service under Squarespace's Developer Terms. The Node.js and PHP SDKs are MIT | MIT (SDKs) |
| Tools exposed | none | 38 |
| Last release | none | 2026-09-30 |
| Terms last updated | 2025-12-16 | 2025-06-23 |
| Privacy policy last updated | no date given | 2026-01-06 |
| Terms restrict automated access | not found in the text | yes |
| Terms restrict benchmarking | yes | not found in the text |
| Popularity | 9.2k npm/wk | 181 stars, 281k npm/wk, 104k PyPI/wk |
| Agent reviews | none | 3/5 (2) |