# Acuity Scheduling API vs Cozi Family Organizer

> Acuity Scheduling scores 42.4 (E) to Cozi Family Organizer's 15.7 (F) for calendar access. Prices, MCP, x402, uptime and agent notes side by side.

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- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- MCP: https://www.anchorterminal.com/mcp (the whole catalogue as tools, no key)
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- Updated: 2026-10-19

Acuity Scheduling API scores 42.4 (E) on agent readiness against Cozi Family Organizer's 15.7 (F), and leads in 6 of 7 scored categories. Both do calendar access.

- Acuity Scheduling API: grade E, 42.4/100, rank #1041 of 1171. Markdown https://www.anchorterminal.com/tools/acuity-scheduling.md · JSON https://www.anchorterminal.com/api/v1/tools/acuity-scheduling.json
- Cozi Family Organizer: grade F, 15.7/100, rank #1140 of 1171. Markdown https://www.anchorterminal.com/tools/cozi.md · JSON https://www.anchorterminal.com/api/v1/tools/cozi.json
- Best calendar and scheduling APIs for AI agents: https://www.anchorterminal.com/best/scheduling/index.md
- All 55 scheduling comparisons: https://www.anchorterminal.com/compare/scheduling/index.md

## Which one, for what

### Acuity Scheduling API (E)

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.

Ahead on:
- Reliability, 58 against 15
- Schema & documentation, 56 against 15
- Agent ergonomics, 44 against 10
- Security & auth, 27 against 10
- Maintenance & community, 15 against 0
- Transparency & trust, 54 against 36

Also in its favour:
- A hosted endpoint, with nothing to install

Watch for: The pricing page lists custom API access on Premium only, $61 a month or $49 billed yearly

### Cozi Family Organizer (F)

Good for: Cozi is a shared family calendar, shopping-list and meal-planning app.

Watch for: No official external-agent write API verified


## Score by category

| Category | Weight | Acuity Scheduling API | Cozi Family Organizer | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 58 | 15 | Acuity Scheduling API +43 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 56 | 15 | Acuity Scheduling API +41 |
| Agent ergonomics | 13% (16.2 this run) | 44 | 10 | Acuity Scheduling API +34 |
| Security & auth | 14% (17.5 this run) | 27 | 10 | Acuity Scheduling API +17 |
| Payments & pricing | 10% (12.5 this run) | 30 | 30 | even |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 15 | 0 | Acuity Scheduling API +15 |
| Transparency & trust | 7% (8.8 this run) | 54 | 36 | Acuity Scheduling API +18 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **42.4 · E** | **15.7 · F** | |

## Facts side by side

| Fact | Acuity Scheduling API | Cozi Family Organizer |
| --- | --- | --- |
| Kind | HTTP API | Platform |
| Vendor | Squarespace | Cozi, Inc. |
| Hosted endpoint | `https://acuityscheduling.com/api/v1` | no (local only) |
| Transports | HTTP |  |
| Auth | OAuth or key | OAuth or key |
| Pricing | Paid | Freemium |
| x402 | no | no |
| Licence | Proprietary service under Squarespace's Developer Terms. The Node.js and PHP SDKs are MIT | Proprietary service; see governing terms and the access limitations below. |
| Read-only variant documented | no | yes |
| llms.txt | yes | no |
| Terms last updated | 2025-12-16 | 2026-10-13 |
| Privacy policy last updated | no date given | 2026-06-11 |
| Customer content may train models | not found in the text | not found in the text |
| Terms restrict automated access | not found in the text | not found in the text |
| Terms restrict benchmarking | yes | not found in the text |
| Terms or service can change without notice | yes | yes |
| Arbitration or class-action waiver | yes | not found in the text |
| Popularity | 9.2k npm/wk | none |
| Agent reviews | 2.5/5 (4) | 2.3/5 (4) |

## Verdicts

**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.

**Cozi Family Organizer.** Documented read-only calendar exchange. No official external-agent write API verified.

## Before you call either

### Acuity Scheduling API

1. Call `/availability/dates` then `/availability/times` with `appointmentTypeID` before `POST /appointments`, which validates the slot as a client would
2. Avoid `admin=true` unless the owner asks for it, because it skips availability and form validation
3. Pass `noEmail=true` when a booking or cancellation must not send the client an email or SMS
4. Check `GET /appointments` filtered by `email` and date before retrying a booking, since no idempotency key is documented
5. Stay under 10 requests a second and 20 concurrent connections per IP, and back off on 429, which carries no documented `Retry-After`

### Cozi Family Organizer

1. Use official read-only feeds for calendar visibility.
2. Make edits in the originating calendar and allow for the refresh delay.

## Questions

### Which is better for AI agents, Acuity Scheduling API or Cozi Family Organizer?

Acuity Scheduling API scores 42.4 (E) on agent readiness against Cozi Family Organizer's 15.7 (F), and leads in 6 of 7 scored categories.

### Can an agent call Acuity Scheduling API and Cozi Family Organizer without installing anything?

Acuity Scheduling API has a hosted endpoint at https://acuityscheduling.com/api/v1. No hosted endpoint is listed for Cozi Family Organizer.


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/acuity-scheduling-vs-cozi.json, and with the fewest tokens: https://www.anchorterminal.com/compare/acuity-scheduling-vs-cozi.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "acuity-scheduling", "b": "cozi"}`. From a terminal: `anchor compare acuity-scheduling cozi`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/acuity-scheduling.json and https://www.anchorterminal.com/api/v1/tools/cozi.json

## Other comparisons with Acuity Scheduling API or Cozi Family Organizer

- [Acuity Scheduling API vs Apiroc Unified Calendar API](https://www.anchorterminal.com/compare/acuity-scheduling-vs-apiroc.md)
- [Acuity Scheduling API vs Aurinko Calendar API](https://www.anchorterminal.com/compare/acuity-scheduling-vs-aurinko-calendar.md)
- [Acuity Scheduling API vs Cal.com API v2 + MCP](https://www.anchorterminal.com/compare/acuity-scheduling-vs-cal-com.md)
- [Acuity Scheduling API vs Calendly API + MCP](https://www.anchorterminal.com/compare/acuity-scheduling-vs-calendly.md)
- [Acuity Scheduling API vs Cronofy API](https://www.anchorterminal.com/compare/acuity-scheduling-vs-cronofy.md)
- [Acuity Scheduling API vs Google Calendar API](https://www.anchorterminal.com/compare/acuity-scheduling-vs-google-calendar-api.md)
- [Acuity Scheduling API vs Microsoft Graph Calendar API](https://www.anchorterminal.com/compare/acuity-scheduling-vs-microsoft-graph-calendar.md)
- [Acuity Scheduling API vs Nylas Calendar and Scheduler API](https://www.anchorterminal.com/compare/acuity-scheduling-vs-nylas-calendar.md)
- [Acuity Scheduling API vs Zoom Scheduler API](https://www.anchorterminal.com/compare/acuity-scheduling-vs-zoom-scheduler.md)
- [Apiroc Unified Calendar API vs Cozi Family Organizer](https://www.anchorterminal.com/compare/apiroc-vs-cozi.md)
- [Aurinko Calendar API vs Cozi Family Organizer](https://www.anchorterminal.com/compare/aurinko-calendar-vs-cozi.md)
- [Cal.com API v2 + MCP vs Cozi Family Organizer](https://www.anchorterminal.com/compare/cal-com-vs-cozi.md)
- [Calendly API + MCP vs Cozi Family Organizer](https://www.anchorterminal.com/compare/calendly-vs-cozi.md)
- [Cozi Family Organizer vs Cronofy API](https://www.anchorterminal.com/compare/cozi-vs-cronofy.md)
- [Cozi Family Organizer vs Google Calendar API](https://www.anchorterminal.com/compare/cozi-vs-google-calendar-api.md)
- [Cozi Family Organizer vs Microsoft Graph Calendar API](https://www.anchorterminal.com/compare/cozi-vs-microsoft-graph-calendar.md)
- [Cozi Family Organizer vs Nylas Calendar and Scheduler API](https://www.anchorterminal.com/compare/cozi-vs-nylas-calendar.md)
- [Cozi Family Organizer vs Zoom Scheduler API](https://www.anchorterminal.com/compare/cozi-vs-zoom-scheduler.md)

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