# Cronofy API vs Truto Unified Calendar API (slim)

> Cronofy scores 67.5 (B) to Truto Unified Calendar's 60.4 (C) for calendar access. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/cronofy-vs-truto-calendar.md (~4,750 tokens) · this version ~2,680 tokens · JSON https://www.anchorterminal.com/compare/cronofy-vs-truto-calendar.json · canonical https://www.anchorterminal.com/compare/cronofy-vs-truto-calendar
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · MCP: https://www.anchorterminal.com/mcp · Updated: 2026-11-07
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)

Cronofy API scores 67.5 (B) on agent readiness against Truto Unified Calendar API's 60.4 (C), and leads in 6 of 7 scored categories. Truto Unified Calendar API leads on schema & documentation. Both do calendar access.

- Cronofy API: B 67.5, rank #320 of 1510 · https://www.anchorterminal.com/tools/cronofy.min.md
- Truto Unified Calendar API: C 60.4, rank #655 of 1510 · https://www.anchorterminal.com/tools/truto-calendar.min.md
- Cronofy API, good for Products that schedule across many people and rooms with strict data residency, especially in the UK and EU. Ahead on Reliability, 95 against 77; Agent ergonomics, 76 against 71; Security & auth, 60 against 52; Payments & pricing, 30 against 20; Maintenance & community, 71 against 50; Transparency & trust, 72 against 61. Also A hosted endpoint, with nothing to install.
- Truto Unified Calendar API, good for Software companies that need their product's agent to read and book across customers' Google, Outlook, Cal.com and Calendly accounts. Ahead on Schema & documentation, 75 against 58.

| Category | Cronofy API | Truto Unified Calendar API |
| --- | --- | --- |
| Reliability (16%) | 95 | 77 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 58 | 75 |
| Agent ergonomics (13%) | 76 | 71 |
| Security & auth (14%) | 60 | 52 |
| Payments & pricing (10%) | 30 | 20 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 71 | 50 |
| Transparency & trust (7%) | 72 | 61 |

| Fact (where they differ) | Cronofy API | Truto Unified Calendar API |
| --- | --- | --- |
| Vendor | Cronofy | Yin Yang Inc. |
| Hosted endpoint | `https://api.cronofy.com` | no (local only) |
| Transports | HTTP, Streamable HTTP |  |
| Auth | OAuth or key | API key |
| Licence | MIT (SDKs) | none |
| Last release | 2026-10-30 | 2026-10-26 |
| Privacy policy last updated | no date given | 2024-10-19 |
| Terms restrict benchmarking | yes | not found in the text |
| 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 |

Why the edge:
- Maintenance & community, Cronofy API +21: Cronofy API 71 (Cronofy's UI Elements, the JavaScript components it publishes for its API, carry a dated changelog in the docs with three code releases in October 2026, 1.68.0 (15 October, Romanian language support), 1.68.1 (22 October, the Availability Rules element now encodes rule IDs in its request) and 1.68.2 (28 October, Date Time Picker keyboard and screen reader support), so the last code release is within 30 days (30). pycronofy 2.1.2 (30 October) and 2.1.1 (25 September) change only packaging, 2.1.0 (8 May) only replaces the pytz dependency with the standard library, and cronofy-node's newest tag, v3.8.4 (15 September 2025), bumps axios. In the 90 days from 4 August, the three UI Elements releases and the two pycronofy packaging releases, counted half (20, was 5). Support through the docs, support pages and support@cronofy.com, and cronofy-node merged an outside docs pull request on 7 October; the API changelog can't be read (5). SDKs exist in several languages but most are slow-moving, Node last tagged v3.8.4 on 15 September 2025 and Ruby last tagged in 2023 (8). CI on the Node and Python SDKs, with Python 3.15 added on 30 October 2026 (8). 30+20+5+8+8 = 71.); 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.)
- Reliability, Cronofy API +18: Cronofy API 95 (Atlassian Statuspage at status.cronofy.com with the API, Scheduler, Meeting Agents and each calendar provider as components (20). history.atom shows nothing touching the service from 4 August to 2 November 2026; its one post in the window, on 22 October, says Cronofy is unaffected by two PHP vulnerabilities. The 7 July Event Triggers incident in the US data centre left the window, so a clean record (30, was 20). 50 requests a second and 500 in any 60 seconds by default (15). 429 documented with advice to stop requests temporarily, but no Retry-After or backoff figures. Event writes are upserts keyed on your `event_id`, so a repeat updates rather than duplicates (10). 99.99% uptime guarantee on Emerging and Growth, and an API SLA policy page (10). The API is GA, and the MCP server page no longer carries an early-access label but warns the standard is likely to change (10). 20+30+15+10+10+10 = 95.); 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.)
- Schema & documentation, Truto Unified Calendar API +17: Cronofy API 58 (No OpenAPI or other machine-readable contract found (0). llms.txt with about 35 to 40 links and Markdown copies of pages (10). Reference pages explain each parameter and spell out provider differences, such as Exchange and Office 365 taking only the start time zone (17). Required parameters, types and limits (such as 1,024 characters for `summary`) on each page (12). Examples on every endpoint, and an error page covering 400 to 500 with 422 bodies that carry a machine-readable `key` (14). `/v1` in the path. The changelog at changelog.cronofy.com is on a host whose robots.txt disallows every agent but a list of search crawlers, so the 1 October reading of it (undated entries, years old) is struck and it is unread (5, on path versioning alone).); Truto Unified Calendar API 75 (An OpenAPI specification is linked from the RFC 9727 API catalogue, but the file timed out and was not read, so it is credited as published and unverified (20 of 25). llms.txt and a Markdown sibling for every page (10). Parameter descriptions say what each does and what it falls back to, such as `end_time` defaulting to the month of `start_time` (15 of 20). Types, required marks and allowed values such as `focus_time` and `out_of_office` (13 of 15). One documented error shape with provider and Truto fields; few request examples on the reference pages read (12 of 15). Deprecated admin endpoints are marked, but no API changelog was found (5 of 15). 20 + 10 + 15 + 13 + 12 + 5 = 75.)
- Transparency & trust, Cronofy API +11: Cronofy API 72 (Closed service with terms naming Cronofy Limited (company 07878590) under English law, and MIT-licensed SDKs (15). The data management policy gives numbers. Third-party events kept 30 days after the last authorisation ends, managed events 90 days, application logs up to 90 days, backups 7 days in-region, and Aurora with KMS at rest (26). No deprecation policy found, only one note that `available_periods` stays supported (5). Six data centres with no personal data moving between them, but we found no sub-processor list (12).); 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.)
- Payments & pricing, Cronofy API +10: Cronofy API 30 (No x402, MPP or L402 (0). Plan prices and per-account overage ($1.39 and $0.69 an account a month) published without login (20). A free developer account exists, but the pricing page doesn't say whether a card is needed (10). Browser signup, and production needs a paid plan (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.)
- Security & auth, Cronofy API +8: Cronofy API 60 (Per-user OAuth with fine scopes, including `free_busy` alone, `read_only`, and `delete_event` separate from `create_event`. Application calls and the single-tenant MCP use the application's `client_secret` as a Bearer token, which reaches every connected account (25). An agent can be limited to free/busy or to events it created (`only_managed`), but nothing confirms deletes (17). Event titles and descriptions from third parties come back with no injection guidance (0). No operator audit log found (0). ISO 27001, 27018 and 27701, SOC 2 Type 2 and a public bug bounty policy. No security.txt, per the 30 September check (18).); Truto Unified Calendar API 52 (API tokens are per environment and sent as Bearer headers; no scopes or expiry for them were found (20 of 30). Per-account MCP servers can be limited to read methods or tags and set to expire, and the customer's connection form can restrict access to specific resources, but the REST token reaches every integrated account in its environment (14 of 20). Event titles, descriptions and attendee text from outside parties pass through, and no prompt-injection guidance was found (0). Plans keep request logs 30 or 90 days (10 of 15). SOC 2 is stated in a 2023 blog post, with no trust page, security.txt or disclosure policy found (8 of 20). 20 + 14 + 0 + 10 + 8 = 52.)