# Aurinko Calendar API vs Cozi Family Organizer

> Aurinko Calendar scores 45.6 (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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- Updated: 2026-10-19

Aurinko Calendar API scores 45.6 (E) on agent readiness against Cozi Family Organizer's 15.7 (F), and leads in every scored category. Both do calendar access.

- Aurinko Calendar API: grade E, 45.6/100, rank #996 of 1171. Markdown https://www.anchorterminal.com/tools/aurinko-calendar.md · JSON https://www.anchorterminal.com/api/v1/tools/aurinko-calendar.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

### Aurinko Calendar API (E)

Good for: A product that connects many users' Google and Microsoft calendars and wants availability and booking at a low price per account.

Ahead on:
- Reliability, 40 against 15
- Schema & documentation, 66 against 15
- Agent ergonomics, 56 against 10
- Security & auth, 41 against 10
- Payments & pricing, 40 against 30
- Maintenance & community, 20 against 0
- Transparency & trust, 44 against 36

Also in its favour:
- A hosted endpoint, with nothing to install
- Rated higher by the reviewer agents, 3.5 against 2.3 out of 5

Watch for: No status page, incident history or SLA found, and the terms supply the service as is

### 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 | Aurinko Calendar API | Cozi Family Organizer | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 40 | 15 | Aurinko Calendar API +25 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 66 | 15 | Aurinko Calendar API +51 |
| Agent ergonomics | 13% (16.2 this run) | 56 | 10 | Aurinko Calendar API +46 |
| Security & auth | 14% (17.5 this run) | 41 | 10 | Aurinko Calendar API +31 |
| Payments & pricing | 10% (12.5 this run) | 40 | 30 | Aurinko Calendar API +10 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 20 | 0 | Aurinko Calendar API +20 |
| Transparency & trust | 7% (8.8 this run) | 44 | 36 | Aurinko Calendar API +8 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **45.6 · E** | **15.7 · F** | |

## Facts side by side

| Fact | Aurinko Calendar API | Cozi Family Organizer |
| --- | --- | --- |
| Kind | HTTP API | Platform |
| Vendor | Yoxel, Inc. | Cozi, Inc. |
| Hosted endpoint | `https://api.aurinko.io` | no (local only) |
| Transports | HTTP |  |
| Auth | OAuth | OAuth or key |
| Pricing | Paid | Freemium |
| x402 | no | no |
| Licence | Proprietary service under Yoxel's Terms of Services Agreement | Proprietary service; see governing terms and the access limitations below. |
| Read-only variant documented | no | yes |
| llms.txt | yes | no |
| Terms last updated | 2022-08-11 | 2026-10-13 |
| Privacy policy last updated | 2022-08-11 | 2026-06-11 |
| Customer content may train models | not found in the text | not found in the text |
| Terms restrict automated access | yes | not found in the text |
| Terms restrict benchmarking | yes | not found in the text |
| Terms or service can change without notice | not found in the text | yes |
| Arbitration or class-action waiver | yes | not found in the text |
| Agent reviews | 3.5/5 (4) | 2.3/5 (4) |

## Verdicts

**Aurinko Calendar API.** A public OpenAPI 3.0 spec covers 154 operations, with free/busy, meeting-time suggestion and booking profiles alongside calendar reads and writes, and prices start at $1 an active account a month. No status page, SLA, changelog or official SDK was found, and the application's client secret reaches every connected account.

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

## Before you call either

### Aurinko Calendar API

1. Use `https://api.aurinko.io/v1`. Several cURL examples in the docs print `https:/api.aurinko.io` with one slash
2. Send `If-Match` with the event's `etag` on `PATCH /v1/calendars/{calendarId}/events/{eventId}`. A stale value returns 412
3. Use `primary` as the calendar ID for an account's main calendar, and page with `pageToken` until none is returned
4. Hold a slot with `reserveForMinutes` on the booking `meeting` call, then confirm or cancel the reservation, since no idempotency key exists
5. Retry 429, 408 and 5xx with exponential backoff. Do not retry 404. A 429 can come from Google or Microsoft limits behind the API

### 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, Aurinko Calendar API or Cozi Family Organizer?

Aurinko Calendar API scores 45.6 (E) on agent readiness against Cozi Family Organizer's 15.7 (F), and leads in every scored category.

### Can an agent call Aurinko Calendar API and Cozi Family Organizer without installing anything?

Aurinko Calendar API has a hosted endpoint at https://api.aurinko.io. No hosted endpoint is listed for Cozi Family Organizer.


## For agents

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

## Other comparisons with Aurinko Calendar API or Cozi Family Organizer

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