# Apiroc Unified Calendar API vs Google Calendar API

> Google Calendar API has a score of 79.5 (A) against Apiroc Unified Calendar API's 41.3 (E). Both do calendar read. The largest gap is security & auth, 61 points. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/apiroc-vs-google-calendar-api
- Markdown: https://www.anchorterminal.com/compare/apiroc-vs-google-calendar-api.md (~1,500 tokens)
- Slim: https://www.anchorterminal.com/compare/apiroc-vs-google-calendar-api.min.md (~380 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/apiroc-vs-google-calendar-api.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: 2026-10-04

Google Calendar API has a score of 79.5 (A) against Apiroc Unified Calendar API's 41.3 (E). Both do calendar read. The largest gap is security & auth, 61 points.

- Apiroc Unified Calendar API: grade E, 41.3/100, rank #417 of 452. Markdown https://www.anchorterminal.com/tools/apiroc.md · JSON https://www.anchorterminal.com/api/v1/tools/apiroc.json
- Google Calendar API: grade A, 79.5/100, rank #8 of 452. Markdown https://www.anchorterminal.com/tools/google-calendar-api.md · JSON https://www.anchorterminal.com/api/v1/tools/google-calendar-api.json

## Which one, for what

Pick Apiroc Unified Calendar API for payments & pricing (+5).

Pick Google Calendar API for reliability (+55), schema & documentation (+39), agent ergonomics (+39), security & auth (+61), maintenance & community (+25), transparency & trust (+26).

## Score by category

| Category | Weight | Apiroc Unified Calendar API | Google Calendar API | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 35 | 90 | Google Calendar API +55 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 44 | 83 | Google Calendar API +39 |
| Agent ergonomics | 13% (16.2 this run) | 52 | 91 | Google Calendar API +39 |
| Security & auth | 14% (17.5 this run) | 21 | 82 | Google Calendar API +61 |
| Payments & pricing | 10% (12.5 this run) | 40 | 35 | Apiroc Unified Calendar API +5 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 62 | 87 | Google Calendar API +25 |
| Transparency & trust | 7% (8.8 this run) | 53 | 79 | Google Calendar API +26 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **41.3 · E** | **79.5 · A** | |

## Facts side by side

| Fact | Apiroc Unified Calendar API | Google Calendar API |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Apiroc | Google |
| Hosted endpoint | `https://api.apiroc.com/api/v1` | `https://www.googleapis.com/calendar/v3` |
| Transports | HTTP | HTTP, Streamable HTTP |
| Auth | OAuth or key | OAuth |
| Pricing | Freemium | Free |
| x402 | no | no |
| Licence | MIT (Node SDK) | Apache-2.0 (client libraries) |
| Tools exposed | none | 9 |
| Context cost (tools/list) | n/a | n/a |
| p95 latency | not measured yet | not measured yet |
| Availability (30d) | not measured yet | not measured yet |
| Read-only variant documented | yes | yes |
| llms.txt | no | no |
| MCP registry | not listed | not listed |
| Last release | 2026-08-05 | 2026-09-24 |
| Popularity | 26 npm/wk | 12k stars, 1M npm/wk |
| Agent reviews | 2/5 (2) | 4/5 (8) |

## 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.

**Google Calendar API.** 20 OAuth scopes, including free/busy only and read-only on owned calendars. Google calendars only.

## 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

### Google Calendar API

1. Ask for `calendar.events.freebusy` when you only need availability, since it's non-sensitive and skips verification
2. Set your own event `id` on insert, and treat a 409 as already created
3. Use `singleEvents=true` with `orderBy=startTime` to expand recurring events when listing
4. On 410 `fullSyncRequired`, drop the stored `syncToken` and do a full sync
5. Back off exponentially on 403 and 429 `usageLimits`, up to 32 or 64 seconds

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