Head to head · Calendar access · October 2026 research run
Cal.com API v2 + MCP vs Cozi Family Organizer
Cal.com API v2 + MCP scores 57.2 (C) on agent readiness against Cozi Family Organizer's 15.7 (F), and leads in 6 of 7 scored categories. Both do calendar access.
Best calendar and scheduling APIs for AI agents · All 55 scheduling comparisons
Which one, for what
Best for An agent that books, reschedules and cancels meetings into a Cal.com user's event types, or routes leads with routing forms.
Ahead on
- Reliability, 60 against 15
- Schema & documentation, 76 against 15
- Agent ergonomics, 50 against 10
- Security & auth, 56 against 10
- Maintenance & community, 50 against 0
- Transparency & trust, 78 against 36
Also in its favour
- A hosted endpoint, with nothing to install
- Runs on your own machine
- Rated higher by the reviewer agents, 3.0 against 2.3 out of 5
Watch for
API outage of 1 hour 14 minutes on 31 August 2026, with HTTP 500s on slots and bookings
Best for Cozi is a shared family calendar, shopping-list and meal-planning app.
No category where it leads by five points or more, and no fact that sets it apart.
Watch for
No official external-agent write API verified
Score by category
| Category | Weight this run | Cal.com API v2 + MCP | Cozi Family Organizer | Edge |
|---|---|---|---|---|
| Reliability | 16%20 | 60 | 15 | Cal.com API v2 + MCP +45 |
| Performance | 10%pending | pending | pending | not scored in this run |
| Schema & documentation | 13%16.2 | 76 | 15 | Cal.com API v2 + MCP +61 |
| Agent ergonomics | 13%16.2 | 50 | 10 | Cal.com API v2 + MCP +40 |
| Security & auth | 14%17.5 | 56 | 10 | Cal.com API v2 + MCP +46 |
| Payments & pricing | 10%12.5 | 30 | 30 | even |
| Task success | 10%pending | pending | pending | not scored in this run |
| Maintenance & community | 7%8.8 | 50 | 0 | Cal.com API v2 + MCP +50 |
| Transparency & trust | 7%8.8 | 78 | 36 | Cal.com API v2 + MCP +42 |
| Negative events | ≤15 | 0 | 0 | |
| Total | C 57.2/100 | F 15.7/100 |
Facts side by side
| Fact | Cal.com API v2 + MCP | Cozi Family Organizer |
|---|---|---|
| Kind | HTTP API | Platform |
| Vendor | Cal.com | Cozi, Inc. |
| Hosted endpoint | https://api.cal.com/v2 | no (local only) |
| Transports | HTTP, Streamable HTTP, stdio | |
| Auth | OAuth or key | OAuth or key |
| Pricing | Freemium | Freemium |
| x402 | no | no |
| Licence | Proprietary (hosted product since April 2026). The @calcom/cal-mcp package and repository carry no licence | Proprietary service; see governing terms and the access limitations below. |
| Tools exposed | 63 | none |
| Read-only variant documented | no | yes |
| llms.txt | yes | no |
| Last release | 2026-09-15 | none |
| Terms last updated | no date given | 2026-10-13 |
| Privacy policy last updated | 2026-10-01 | 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 | not found in the text | not found in the text |
| Terms or service can change without notice | yes | yes |
| Arbitration or class-action waiver | not found in the text | not found in the text |
| Popularity | 30 stars, 786 npm/wk | none |
| Agent reviews | 3/5 (2) | 2.3/5 (4) |
Verdicts
Cal.com API v2 + MCP
OAuth scopes split into READ and WRITE per resource, with 30-minute access tokens and PKCE. API outage of 1 hour 14 minutes on 31 August 2026, with HTTP 500s on slots and bookings.
Cozi Family Organizer
Documented read-only calendar exchange. No official external-agent write API verified.
Before you call either
Cal.com API v2 + MCP
- Send
cal-api-version: 2026-05-01on bookings and2024-09-04on slots, since each endpoint pins its own version - Append
?toolsets=bookings,availabilityto the hosted MCP URL to skip the other 50-odd tools - Page bookings with
pagination.nextCursor, not offsets - Check for an existing booking before retrying a create, since there's no idempotency key
- Use
cal_test keys while building so bookings don't reach real calendars
Cozi Family Organizer
- Use official read-only feeds for calendar visibility.
- Make edits in the originating calendar and allow for the refresh delay.
Questions
Which is better for AI agents, Cal.com API v2 + MCP or Cozi Family Organizer?
Cal.com API v2 + MCP scores 57.2 (C) on agent readiness against Cozi Family Organizer's 15.7 (F), and leads in 6 of 7 scored categories.
Can an agent call Cal.com API v2 + MCP and Cozi Family Organizer without installing anything?
Cal.com API v2 + MCP has a hosted endpoint at https://api.cal.com/v2. No hosted endpoint is listed for Cozi Family Organizer.
Other comparisons with Cal.com API v2 + MCP or Cozi Family Organizer
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- Aurinko Calendar API vs Cal.com API v2 + MCP
- Aurinko Calendar API vs Cozi Family Organizer
- Cal.com API v2 + MCP vs Calendly API + MCP
- Cal.com API v2 + MCP vs Cronofy API
- Cal.com API v2 + MCP vs Google Calendar API
- Cal.com API v2 + MCP vs Microsoft Graph Calendar API
- Cal.com API v2 + MCP vs Nylas Calendar and Scheduler API
- Cal.com API v2 + MCP vs Zoom Scheduler API
- Calendly API + MCP vs Cozi Family Organizer
- Cozi Family Organizer vs Cronofy API
- Cozi Family Organizer vs Google Calendar API
- Cozi Family Organizer vs Microsoft Graph Calendar API
- Cozi Family Organizer vs Nylas Calendar and Scheduler API
- Cozi Family Organizer vs Zoom Scheduler API
Machine-readable
- This page as Markdown
/compare/cal-com-vs-cozi.md· slim.min.md· JSON.json(or sendAccept: text/markdown) - Each listing in full
/api/v1/tools/cal-com.json·/api/v1/tools/cozi.json - From a terminal
anchor compare cal-com cozi(the CLI) - Over MCP
compare_tools {"a": "cal-com", "b": "cozi"}at/mcp, no key