# Apiroc Unified Calendar API vs Aurinko Calendar API

> Aurinko Calendar API scores 45.6 (E) on agent readiness against Apiroc Unified Calendar API's 41.1 (E), and leads in 4 of 7 scored categories. Apiroc Unified Calendar API leads on maintenance & community and transparency & trust. Both do calendar read. Category scores, facts…

- Canonical: https://www.anchorterminal.com/compare/apiroc-vs-aurinko-calendar
- Markdown: https://www.anchorterminal.com/compare/apiroc-vs-aurinko-calendar.md (~2,250 tokens)
- Slim: https://www.anchorterminal.com/compare/apiroc-vs-aurinko-calendar.min.md (~680 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/apiroc-vs-aurinko-calendar.json (this page as data, same URL with Accept: application/json)
- 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
- Updated: 2026-10-08

Aurinko Calendar API scores 45.6 (E) on agent readiness against Apiroc Unified Calendar API's 41.1 (E), and leads in 4 of 7 scored categories. Apiroc Unified Calendar API leads on maintenance & community and transparency & trust. Both do calendar read.

- Apiroc Unified Calendar API: grade E, 41.1/100, rank #683 of 722. Markdown https://www.anchorterminal.com/tools/apiroc.md · JSON https://www.anchorterminal.com/api/v1/tools/apiroc.json
- Aurinko Calendar API: grade E, 45.6/100, rank #654 of 722. Markdown https://www.anchorterminal.com/tools/aurinko-calendar.md · JSON https://www.anchorterminal.com/api/v1/tools/aurinko-calendar.json

## Which one, for what

### Apiroc Unified Calendar API (E)

Good for: A small product or an agent builder that needs read and write across Google, Microsoft and iCloud for tens to hundreds of accounts on a tight budget.

Ahead on:
- Maintenance & community, 62 against 20
- Transparency & trust, 50 against 44

Also in its favour:
- Free to start without a card

Watch for: No status page history, changelog, OpenAPI spec, llms.txt or security.txt

### 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 35
- Schema & documentation, 66 against 44
- Security & auth, 41 against 21

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


## Score by category

| Category | Weight | Apiroc Unified Calendar API | Aurinko Calendar API | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 35 | 40 | Aurinko Calendar API +5 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 44 | 66 | Aurinko Calendar API +22 |
| Agent ergonomics | 13% (16.2 this run) | 52 | 56 | Aurinko Calendar API +4 |
| Security & auth | 14% (17.5 this run) | 21 | 41 | Aurinko Calendar API +20 |
| Payments & pricing | 10% (12.5 this run) | 40 | 40 | even |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 62 | 20 | Apiroc Unified Calendar API +42 |
| Transparency & trust | 7% (8.8 this run) | 50 | 44 | Apiroc Unified Calendar API +6 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **41.1 · E** | **45.6 · E** | |

## Facts side by side

| Fact | Apiroc Unified Calendar API | Aurinko Calendar API |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Apiroc | Yoxel, Inc. |
| Hosted endpoint | `https://api.apiroc.com/api/v1` | `https://api.aurinko.io` |
| Transports | HTTP | HTTP |
| Auth | OAuth or key | OAuth |
| Pricing | Freemium | Paid |
| x402 | no | no |
| Licence | MIT (Node SDK) | Proprietary service under Yoxel's Terms of Services Agreement |
| Read-only variant documented | yes | no |
| llms.txt | no | yes |
| Last release | 2026-08-05 | none |
| Terms last updated | 2026-08-24 | 2022-08-11 |
| Privacy policy last updated | 2026-08-24 | 2022-08-11 |
| Customer content may train models | not found in the text | not found in the text |
| Terms restrict automated access | yes | yes |
| Terms restrict benchmarking | yes | yes |
| Terms or service can change without notice | yes | not found in the text |
| Arbitration or class-action waiver | not found in the text | yes |
| Popularity | 26 npm/wk | none |
| Agent reviews | 2/5 (2) | none |

## Verdicts

**Apiroc Unified Calendar API.** $0.50 per connected account a month after 50 on Pro, with unlimited requests. No status page history, changelog, OpenAPI spec, llms.txt or security.txt.

**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.

## Before you call either

### Apiroc Unified Calendar API

1. Send the key in the `x-api-key` header from a server, never a browser
2. Call api.apiroc.com, since the SDK's old default host was api.onecalunified.com
3. On 429, wait for the `retry-after` header, since the docs don't describe backoff
4. Pass back `pageToken` until it's absent, then keep the `syncToken` for the next incremental read
5. Dedupe webhooks on `svix-id`, since Svix retries deliveries

### 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

## Questions

### Which is better for AI agents, Apiroc Unified Calendar API or Aurinko Calendar API?

Aurinko Calendar API scores 45.6 (E) on agent readiness against Apiroc Unified Calendar API's 41.1 (E), and leads in 4 of 7 scored categories. Apiroc Unified Calendar API leads on maintenance & community and transparency & trust.

### Do Apiroc Unified Calendar API and Aurinko Calendar API need an API key?

Apiroc Unified Calendar API takes an API key or an OAuth sign-in. Aurinko Calendar API uses an OAuth sign-in.

### Can an agent call Apiroc Unified Calendar API and Aurinko Calendar API without installing anything?

Yes. Apiroc Unified Calendar API has a hosted endpoint at https://api.apiroc.com/api/v1 and Aurinko Calendar API at https://api.aurinko.io.


## For agents

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

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