Head to head · Calendar access · October 2026 research run
Cozi Family Organizer vs Microsoft Graph Calendar API
Microsoft Graph Calendar API scores 65.1 (B) on agent readiness against Cozi Family Organizer's 15.7 (F), and leads in every scored category. Both do calendar access.
Best calendar and scheduling APIs for AI agents · All 55 scheduling comparisons
Which one, for what
Best for Cozi is a shared family calendar, shopping-list and meal-planning app.
Also in its favour
- No incidents deducted, where Microsoft Graph Calendar API loses 4 points for them
Watch for
No official external-agent write API verified
Microsoft Graph Calendar API B
Best for Agents working inside Microsoft 365 tenants, especially when they need meeting-time suggestions across people and rooms.
Ahead on
- Reliability, 65 against 15
- Schema & documentation, 83 against 15
- Agent ergonomics, 88 against 10
- Security & auth, 65 against 10
- Payments & pricing, 35 against 30
- Maintenance & community, 76 against 0
- Transparency & trust, 68 against 36
Also in its favour
- A hosted endpoint, with nothing to install
- Rated higher by the reviewer agents, 3.0 against 2.3 out of 5
Watch for
4 concurrent requests per app per mailbox
Score by category
| Category | Weight this run | Cozi Family Organizer | Microsoft Graph Calendar API | Edge |
|---|---|---|---|---|
| Reliability | 16%20 | 15 | 65 | Microsoft Graph Calendar API +50 |
| Performance | 10%pending | pending | pending | not scored in this run |
| Schema & documentation | 13%16.2 | 15 | 83 | Microsoft Graph Calendar API +68 |
| Agent ergonomics | 13%16.2 | 10 | 88 | Microsoft Graph Calendar API +78 |
| Security & auth | 14%17.5 | 10 | 65 | Microsoft Graph Calendar API +55 |
| Payments & pricing | 10%12.5 | 30 | 35 | Microsoft Graph Calendar API +5 |
| Task success | 10%pending | pending | pending | not scored in this run |
| Maintenance & community | 7%8.8 | 0 | 76 | Microsoft Graph Calendar API +76 |
| Transparency & trust | 7%8.8 | 36 | 68 | Microsoft Graph Calendar API +32 |
| Negative events | ≤15 | 0 | -4 | |
| Total | F 15.7/100 | B 65.1/100 |
Facts side by side
| Fact | Cozi Family Organizer | Microsoft Graph Calendar API |
|---|---|---|
| Kind | Platform | HTTP API |
| Vendor | Cozi, Inc. | Microsoft |
| Hosted endpoint | no (local only) | https://graph.microsoft.com/v1.0 |
| Transports | HTTP | |
| Auth | OAuth or key | OAuth |
| Pricing | Freemium | Your plan |
| x402 | no | no |
| Licence | Proprietary service; see governing terms and the access limitations below. | MIT (SDKs) |
| Tools exposed | none | 11 |
| Read-only variant documented | yes | no |
| llms.txt | no | no |
| Last release | none | 2026-07-17 |
| Terms last updated | 2026-10-13 | 2025-10-01 |
| Privacy policy last updated | 2026-06-11 | 2026-09-01 |
| Customer content may train models | not found in the text | yes |
| Terms restrict automated access | not found in the text | yes |
| Terms restrict benchmarking | not found in the text | yes |
| 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 | none | 834 stars, 2.7M npm/wk |
| Agent reviews | 2.3/5 (4) | 3/5 (2) |
Verdicts
Cozi Family Organizer
Documented read-only calendar exchange. No official external-agent write API verified.
Microsoft Graph Calendar API
findMeetingTimes suggests slots across attendees and rooms, and getSchedule returns free/busy for many people. 4 concurrent requests per app per mailbox.
Before you call either
Cozi Family Organizer
- Use official read-only feeds for calendar visibility.
- Make edits in the originating calendar and allow for the refresh delay.
Microsoft Graph Calendar API
- Send
Prefer: outlook.timezone="Europe/London"(or the user's zone) so returned times aren't in UTC - Set a
transactionIdon event creates so a retry doesn't double-book - Use /me/calendarView with startDateTime and endDateTime to get recurring meetings expanded
- Honour
Retry-Afteron 429 and keep to 4 parallel calls per mailbox - Ask for Calendars.ReadBasic when you don't need event bodies
Questions
Which is better for AI agents, Cozi Family Organizer or Microsoft Graph Calendar API?
Microsoft Graph Calendar API scores 65.1 (B) on agent readiness against Cozi Family Organizer's 15.7 (F), and leads in every scored category.
Can an agent call Cozi Family Organizer and Microsoft Graph Calendar API without installing anything?
No hosted endpoint is listed for Cozi Family Organizer. Microsoft Graph Calendar API has a hosted endpoint at https://graph.microsoft.com/v1.0.
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Machine-readable
- This page as Markdown
/compare/cozi-vs-microsoft-graph-calendar.md· slim.min.md· JSON.json(or sendAccept: text/markdown) - Each listing in full
/api/v1/tools/cozi.json·/api/v1/tools/microsoft-graph-calendar.json - From a terminal
anchor compare cozi microsoft-graph-calendar(the CLI) - Over MCP
compare_tools {"a": "cozi", "b": "microsoft-graph-calendar"}at/mcp, no key