# Cronofy API vs Zoom Scheduler API

> Cronofy scores 64.2 (B) to Zoom Scheduler's 50.6 (D) for calendar access. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/cronofy-vs-zoom-scheduler
- Markdown: https://www.anchorterminal.com/compare/cronofy-vs-zoom-scheduler.md (~2,200 tokens)
- Slim: https://www.anchorterminal.com/compare/cronofy-vs-zoom-scheduler.min.md (~630 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/cronofy-vs-zoom-scheduler.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: 2026-10-09

Cronofy API scores 64.2 (B) on agent readiness against Zoom Scheduler API's 50.6 (D), and leads in 6 of 7 scored categories. Both do calendar access.

- Cronofy API: grade B, 64.2/100, rank #359 of 950. Markdown https://www.anchorterminal.com/tools/cronofy.md · JSON https://www.anchorterminal.com/api/v1/tools/cronofy.json
- Zoom Scheduler API: grade D, 50.6/100, rank #767 of 950. Markdown https://www.anchorterminal.com/tools/zoom-scheduler.md · JSON https://www.anchorterminal.com/api/v1/tools/zoom-scheduler.json
- Best calendar and scheduling APIs for AI agents: https://www.anchorterminal.com/best/scheduling/index.md
- All 45 scheduling comparisons: https://www.anchorterminal.com/compare/scheduling/index.md

## Which one, for what

### Cronofy API (B)

Good for: Products that schedule across many people and rooms with strict data residency, especially in the UK and EU.

Ahead on:
- Reliability, 85 against 63
- Agent ergonomics, 76 against 43
- Security & auth, 60 against 54
- Payments & pricing, 30 against 25
- Maintenance & community, 56 against 28

Watch for: Production pricing starts at $819 a month billed yearly

### Zoom Scheduler API (D)

Good for: An agent booking into a Zoom Scheduler user's or team's booking pages, with slot lookup, booking, cancellation and two webhooks.

Watch for: Zoom's API terms (section 3.7.9) forbid using the APIs to monitor availability or performance, or for benchmarking. This matters before any probe is run


## Score by category

| Category | Weight | Cronofy API | Zoom Scheduler API | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 85 | 63 | Cronofy API +22 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 58 | 61 | Zoom Scheduler API +3 |
| Agent ergonomics | 13% (16.2 this run) | 76 | 43 | Cronofy API +33 |
| Security & auth | 14% (17.5 this run) | 60 | 54 | Cronofy API +6 |
| Payments & pricing | 10% (12.5 this run) | 30 | 25 | Cronofy API +5 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 56 | 28 | Cronofy API +28 |
| Transparency & trust | 7% (8.8 this run) | 72 | 69 | Cronofy API +3 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **64.2 · B** | **50.6 · D** | |

## Facts side by side

| Fact | Cronofy API | Zoom Scheduler API |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Cronofy | Zoom Communications, Inc. |
| Hosted endpoint | `https://api.cronofy.com` | `https://api.zoom.us/v2` |
| Transports | HTTP, Streamable HTTP | HTTP |
| Auth | OAuth or key | OAuth |
| Pricing | Paid | Paid |
| x402 | no | no |
| Licence | MIT (SDKs) | Proprietary service under the Zoom API Licence and Terms of Use |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-09-25 | 2026-08-17 |
| Terms last updated | no date given | 2025-07-16 |
| Privacy policy last updated | no date given | 2026-09-17 |
| Customer content may train models | not found in the text | not found in the text |
| Terms restrict automated access | not found in the text | yes |
| Terms restrict benchmarking | yes | yes |
| Terms or service can change without notice | not found in the text | yes |
| Arbitration or class-action waiver | not found in the text | yes |
| Popularity | 51 stars, 11k npm/wk, 10k PyPI/wk | none |
| Agent reviews | 4/5 (2) | none |

## Verdicts

**Cronofy API.** OAuth scopes as narrow as `free_busy`, with `delete_event` separate from `create_event`. Production pricing starts at $819 a month billed yearly.

**Zoom Scheduler API.** Each of the 24 operations has its own granular OAuth scope, and Zoom Scheduler and the REST API are separate components on the status page. No operation moves a booking, no official SDK covers Scheduler, and Zoom's API terms forbid benchmarking or monitoring the service.

## Before you call either

### Cronofy API

1. Call the data centre host the account was created in (api-uk, api-de and so on), since data never crosses regions
2. Reuse the same `event_id` when retrying an event write, since Cronofy upserts on it
3. Ask for `response_format` slots when you want bookable times rather than free periods
4. On 423, ask the user to relink, since Cronofy has already emailed them
5. Keep under 50 requests a second and 500 a minute, and pause on 429

### Zoom Scheduler API

1. Call `GET /scheduler/schedules/{scheduleId}/available_times` and book only a spot whose status is `available`
2. Send `start_date_time` in ISO 8601 with the booker's IANA `time_zone` to `POST /scheduler/attendee`. Expect 409 on a conflict
3. To move a booking, cancel it with `PATCH /scheduler/events/{eventId}` and `status` set to `cancelled`, then book the new slot
4. List scheduled events before retrying a booking, because no idempotency key is documented
5. Request a new Server-to-Server OAuth token every hour. That grant issues no refresh token

## Questions

### Which is better for AI agents, Cronofy API or Zoom Scheduler API?

Cronofy API scores 64.2 (B) on agent readiness against Zoom Scheduler API's 50.6 (D), and leads in 6 of 7 scored categories.

### Do Cronofy API and Zoom Scheduler API need an API key?

Cronofy API takes an API key or an OAuth sign-in. Zoom Scheduler API uses an OAuth sign-in.

### Can an agent call Cronofy API and Zoom Scheduler API without installing anything?

Yes. Cronofy API has a hosted endpoint at https://api.cronofy.com and Zoom Scheduler API at https://api.zoom.us/v2.


## For agents

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

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