Cal.com API v2 + MCP vs Truto Unified Calendar API

Cal.com API v2 + MCP 50

63 tools on the hosted MCP (5), with a toolsets query parameter to load only the groups you need and catalogue meta-tools (find, describe and call an API operation) (+10). Cursor pagination with limit, and filters on status, attendee, event type, team and start, end, created and updated times (20). Error envelope without documented codes (8). No idempotency key on bookings found, and we couldn't read the hosted tools for readOnlyHint or destructiveHint (0). No official REST SDK in two languages (Atoms is React components), and every endpoint needs the right version header (7). Per the 1 October check, not re-read on 4 November. Total 50.

Truto Unified Calendar API 71

truto_exclude_fields, truto_ignore_remote_data, truto_key_by and response formats (unified, raw, normalized) size the reply (22 of 25). Query operators such as [gt] and [in], sort_by, limit and cursors, with a meta endpoint that says which filters each vendor supports (18 of 20). Errors name the HTTP status and say whether Truto or the provider failed, with the provider's message extracted (18 of 20). No idempotency key found for creates (5 of 20). Every call needs only the token and integrated_account_id; a CLI and the Link SDK exist, with no general API SDK found (8 of 15). 22 + 18 + 18 + 5 + 8 = 71.

Cal.com API v2 + MCP 80

Closed source since 14 April 2026. The Terms of Service were rewritten as version 2.0, effective 1 November 2026, naming Cal.com, Inc., a Delaware corporation, under Delaware law, and they say Cal.diy and Cal.com's other open-source releases are governed by their own licences (MIT for Cal.diy). Closed with clear terms (15, from 12). Privacy policy (20 August 2026) says nothing is used to train models, account data is kept while active with a 30-day export window after closure, and logs exclude personal data. DPA in the compliance portal (22). Platform deprecation dated 15 December 2025 and date-pinned API versions. The new terms promise prior notice by email or in product for updates that materially reduce a customer's rights, and name a periodic changelog for deprecations (14). Subprocessors are listed in the trust centre per the privacy policy, which we didn't open, and data sits in the US with EU residency on request (13). Privacy, DPA and trust readings are per the 1 October check, not re-read on 4 November. Total 64.

Truto Unified Calendar API 61

Closed service under terms naming Yin Yang Inc. (15 of 30). Truto says it stores no customer data and calls vendors live, logs are kept 30 or 90 days by plan, data is kept 15 days after termination, and a DPA is public (25 of 30). Deprecated admin endpoints are marked with no policy or dates (6 of 20). Enterprise customers can choose a data region and tokens can be stored regionally; no subprocessor list was found (8 of 20). 15 + 25 + 6 + 8 = 54.

Cal.com API v2 + MCP 35

The newest dated change found for the hosted API is the v6.9 changelog post of 15 September 2026, 50 days before this check, and cal.com hosts are paused so the blog wasn't re-read (20, from 30, cause time). One dated changelog post in the 90 days partly meets the three-entry line, so the earlier partial value is kept, pending the founder's rule on in-between values (5). The @calcom/cal-mcp repository's last commit is 0.0.6 on 22 May 2025, and calcom/cal.com now holds the Cal.diy fork, whose last version tag (v6.2.0) is dated 1 March 2026, so neither adds a release. A 4 November Cal.diy commit says @calcom/atoms is now published from a separate repository at 2.6.12; npm wasn't readable, so its dates are unchecked. Public blog changelog and support, no public issue tracker for the closed product (10). No current official REST SDKs, and the npm MCP package has sat at 0.0.6 since 22 May 2025 (5). The cal-mcp repository's test workflow has its test step commented out (0). Total 40.

Truto Unified Calendar API 50

No API changelog, so the last API change can't be dated; the official @truto/truto-link-sdk was published as 1.3.5 on 26 October 2026, which we take as the latest dated release (20 of 30, since it is the connection widget, not the calendar API). Six Link SDK versions since 8 August (10 of 20, for the same reason). Support through Slack on paid plans, with no public tracker (5 of 15). A CLI and the Link SDK are official, with no API client (10 of 15). Package health not checked (5 of 10). 20 + 10 + 5 + 10 + 5 = 50.

Cal.com API v2 + MCP 65

OpenStatus page at status.cal.com with App, Website and API components and an events log back to February 2024, per the 1 October reading (20). cal.com hosts are paused for this run under the terms of 1 November 2026, so the page wasn't re-read. In the readable part of the window, the 31 August outage (1 hour 14 minutes of HTTP 500s on /v2/slots and /v2/bookings, US East only) hit one region and two endpoints, and the 15 September event was a 1 hour 19 minute degradation of App and API. This run reads one region or a group of calls as partial, so both count as minor. 1 October to 4 November is unread and not credited (20, from 10). 120 requests a minute per key or OAuth token, raisable to 200 and then to 800 on request (15). No 429 behaviour, rate-limit headers or retry guidance in the docs or the OpenAPI spec (0). Enterprise lists "SLA guarantees" with no published figure or document, and a listed SLA nobody could read gives 0 in this run (0, from 5). API v2 is GA (10). Total 65.

Truto Unified Calendar API 77

Graded as a hosted service on the Unified Calendar API. Better Stack status page with components for api.truto.one health, ping and link-token endpoints and the static IP proxy, with incident history (20). The feed lists "APIs and Dashboard are down" on 29 October 2026 and delayed sync jobs and webhooks on 1 November, which counts as one major outage (10). Truto's own limit is 50 requests every 10 seconds per integrated account, in front of each vendor's (15). A vendor 429 comes back with Retry-After and normalised ratelimit-limit, -remaining and -reset headers, with no idempotency guidance for creates (12 of 15). The Enterprise plan lists an SLA guarantee (10). Generally available (10). 20 + 10 + 15 + 12 + 10 + 10 = 77.

Cal.com API v2 + MCP 30

No x402, MPP or L402 (0). Seat prices published ($12 and $28 a user a month billed yearly) but nothing per call or per booking (10). Free plan for one user with API access, no card (20). Browser signup, and OAuth clients need admin approval (0).

Truto Unified Calendar API 20

No x402, MPP or L402 (0). Plan prices per connector a year are public, with unlimited calls (10). A free 30-day sandbox is given after a work-email request reviewed within a business day (10 of 20). A person requests access or books a demo (0). 0 + 10 + 10 + 0 = 20.