Cronofy

Cronofy is a scheduling and calendar API platform that provides a unified interface to Google Calendar, Microsoft 365 / Outlook, Exchange, and Apple iCloud. Its REST API powers two-way calendar sync, real-time availability and scheduling, smart invites, scheduling links, and push notifications for software teams embedding scheduling into their products.

Cronofy publishes 5 API contracts indexed on the APIs.io network, including Availability API, Calendars API, Events API, and 2 more. Tagged areas include Scheduling, Calendar, Availability, Booking, and Productivity.

Cronofy’s developer surface includes authentication, documentation, engineering blog, and 8 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

29.6/100 thin ▼ -7.4 Agent 18/100 agent aware Front door AI 4/6 moderate saas Full breakdown ↓
scored 2026-10-17 · rubric v0.24.0

AccessPaid

1 published contract

Scheduling Calendar Availability Booking Productivity

Kin Score

Kin Score How this is scored →
scored 2026-10-17 · rubric v0.24.0

Composite quality — 29.6/100 · thin

Contract Quality 9.7 / 19

Developer Ergonomics 4.8 / 15

Access Clarity 1.2 / 15

Operational Transparency 0.8 / 10

Contract Governance 0.0 / 9

Discoverability 5.0 / 8

Regulatory Posture 1.8 / 15

Create-or-Update Ergonomics 2.2 / 10

Agent readiness — 18/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/cronofy: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Workplace Collaboration App Marketplaces	builds-on	48.5	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

APIs 5

Individual APIs this provider publishes, each with its own machine-readable definition.

Cronofy Availability API

Availability queries and hosted real-time scheduling.

Cronofy Calendars API

Connected calendars, application calendars, and account identity.

Cronofy Events API

Reading, creating, updating, and deleting events plus free/busy.

Cronofy Push Notifications API

Notification channels for real-time calendar changes.

Cronofy Smart Invites API

Calendar invites tracked without calendar authorization.

Open Collections 7

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

API Collection

OPEN COLLECTION

Cronofy Availability API

OPEN COLLECTION

Cronofy Availability Calendars API

OPEN COLLECTION

Cronofy Availability Events API

OPEN COLLECTION

Cronofy Availability Push Notifications API

OPEN COLLECTION

Cronofy Availability Smart Invites API

OPEN COLLECTION

Cronofy API

OPEN COLLECTION

Scroll for all 7

Pricing Plans 1

Published pricing tiers and plan structures.

Cronofy Plans Pricing

4 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Cronofy Rate Limits

2 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Cronofy Finops

FINOPS

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Cronofy Authentication

http · 1 scheme

SECURITY

Cronofy Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Cronofy Agentic Access

16 operations · 10 acting

AGENTIC

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 1

Status, limits, changes, and where to get help

RateLimits

RateLimits

Commercial 2

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

Company 3

The organization behind the API

LinkedIn

Website

Website

Blog

Blog

Source (apis.yml)

aid: cronofy
url: https://raw.githubusercontent.com/api-evangelist/cronofy/refs/heads/main/apis.yml
name: Cronofy
kind: company
description: Cronofy is a scheduling and calendar API platform that provides a unified interface to Google Calendar, Microsoft
  365 / Outlook, Exchange, and Apple iCloud. Its REST API powers two-way calendar sync, real-time availability and scheduling,
  smart invites, scheduling links, and push notifications for software teams embedding scheduling into their products.
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: paid
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Paid
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-09-03'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/cronofy.png
tags:
- Scheduling
- Calendar
- Availability
- Booking
- Productivity
created: '2026-06-21'
modified: '2026-06-21'
specificationVersion: '0.23'
apis:
- aid: cronofy:cronofy-availability-api
  name: Cronofy Availability API
  description: Availability queries and hosted real-time scheduling.
  humanURL: https://docs.cronofy.com/developers/api/calendars/
  baseURL: https://api.cronofy.com/v1
  tags:
  - Availability
  properties:
  - type: OpenAPI
    url: openapi/cronofy-availability-api-openapi.yml
  - type: Documentation
    url: https://docs.cronofy.com/developers/api/calendars/
  - type: APIReference
    url: https://docs.cronofy.com/developers/api/
  - type: PostmanCollection
    url: collections/cronofy.postman_collection.json
  - type: OpenCollection
    url: collections/cronofy.opencollection.json
  - type: Documentation
    url: https://docs.cronofy.com/developers/api/events/
  - type: APIReference
    url: https://docs.cronofy.com/developers/api/events/free-busy/
  - type: Documentation
    url: https://docs.cronofy.com/developers/api/scheduling/
  - type: APIReference
    url: https://docs.cronofy.com/developers/api/scheduling/availability/
  - type: Documentation
    url: https://docs.cronofy.com/developers/api/smart-invites/
  - type: APIReference
    url: https://docs.cronofy.com/developers/api/smart-invites/create-smart-invite/
  - type: Documentation
    url: https://docs.cronofy.com/developers/api/scheduling/real-time-scheduling/
  - type: APIReference
    url: https://docs.cronofy.com/developers/api/scheduling/
  - type: Documentation
    url: https://docs.cronofy.com/developers/api/push-notifications/
  - type: APIReference
    url: https://docs.cronofy.com/developers/api/push-notifications/create-channel/
- aid: cronofy:cronofy-calendars-api
  name: Cronofy Calendars API
  description: Connected calendars, application calendars, and account identity.
  humanURL: https://docs.cronofy.com/developers/api/calendars/
  baseURL: https://api.cronofy.com/v1
  tags:
  - Calendar
  tags_raw:
  - Calendars
  properties:
  - type: OpenAPI
    url: openapi/cronofy-calendars-api-openapi.yml
  - type: Documentation
    url: https://docs.cronofy.com/developers/api/calendars/
  - type: APIReference
    url: https://docs.cronofy.com/developers/api/
  - type: PostmanCollection
    url: collections/cronofy.postman_collection.json
  - type: OpenCollection
    url: collections/cronofy.opencollection.json
  - type: Documentation
    url: https://docs.cronofy.com/developers/api/events/
  - type: APIReference
    url: https://docs.cronofy.com/developers/api/events/free-busy/
  - type: Documentation
    url: https://docs.cronofy.com/developers/api/scheduling/
  - type: APIReference
    url: https://docs.cronofy.com/developers/api/scheduling/availability/
  - type: Documentation
    url: https://docs.cronofy.com/developers/api/smart-invites/
  - type: APIReference
    url: https://docs.cronofy.com/developers/api/smart-invites/create-smart-invite/
  - type: Documentation
    url: https://docs.cronofy.com/developers/api/scheduling/real-time-scheduling/
  - type: APIReference
    url: https://docs.cronofy.com/developers/api/scheduling/
  - type: Documentation
    url: https://docs.cronofy.com/developers/api/push-notifications/
  - type: APIReference
    url: https://docs.cronofy.com/developers/api/push-notifications/create-channel/
- aid: cronofy:cronofy-events-api
  name: Cronofy Events API
  description: Reading, creating, updating, and deleting events plus free/busy.
  humanURL: https://docs.cronofy.com/developers/api/calendars/
  baseURL: https://api.cronofy.com/v1
  tags:
  - Event
  tags_raw:
  - Events
  properties:
  - type: OpenAPI
    url: openapi/cronofy-events-api-openapi.yml
  - type: Documentation
    url: https://docs.cronofy.com/developers/api/calendars/
  - type: APIReference
    url: https://docs.cronofy.com/developers/api/
  - type: PostmanCollection
    url: collections/cronofy.postman_collection.json
  - type: OpenCollection
    url: collections/cronofy.opencollection.json
  - type: Documentation
    url: https://docs.cronofy.com/developers/api/events/
  - type: APIReference
    url: https://docs.cronofy.com/developers/api/events/free-busy/
  - type: Documentation
    url: https://docs.cronofy.com/developers/api/scheduling/
  - type: APIReference
    url: https://docs.cronofy.com/developers/api/scheduling/availability/
  - type: Documentation
    url: https://docs.cronofy.com/developers/api/smart-invites/
  - type: APIReference
    url: https://docs.cronofy.com/developers/api/smart-invites/create-smart-invite/
  - type: Documentation
    url: https://docs.cronofy.com/developers/api/scheduling/real-time-scheduling/
  - type: APIReference
    url: https://docs.cronofy.com/developers/api/scheduling/
  - type: Documentation
    url: https://docs.cronofy.com/developers/api/push-notifications/
  - type: APIReference
    url: https://docs.cronofy.com/developers/api/push-notifications/create-channel/
- aid: cronofy:cronofy-push-notifications-api
  name: Cronofy Push Notifications API
  description: Notification channels for real-time calendar changes.
  humanURL: https://docs.cronofy.com/developers/api/calendars/
  baseURL: https://api.cronofy.com/v1
  tags:
  - Push Notifications
  properties:
  - type: OpenAPI
    url: openapi/cronofy-push-notifications-api-openapi.yml
  - type: Documentation
    url: https://docs.cronofy.com/developers/api/calendars/
  - type: APIReference
    url: https://docs.cronofy.com/developers/api/
  - type: PostmanCollection
    url: collections/cronofy.postman_collection.json
  - type: OpenCollection
    url: collections/cronofy.opencollection.json
  - type: Documentation
    url: https://docs.cronofy.com/developers/api/events/
  - type: APIReference
    url: https://docs.cronofy.com/developers/api/events/free-busy/
  - type: Documentation
    url: https://docs.cronofy.com/developers/api/scheduling/
  - type: APIReference
    url: https://docs.cronofy.com/developers/api/scheduling/availability/
  - type: Documentation
    url: https://docs.cronofy.com/developers/api/smart-invites/
  - type: APIReference
    url: https://docs.cronofy.com/developers/api/smart-invites/create-smart-invite/
  - type: Documentation
    url: https://docs.cronofy.com/developers/api/scheduling/real-time-scheduling/
  - type: APIReference
    url: https://docs.cronofy.com/developers/api/scheduling/
  - type: Documentation
    url: https://docs.cronofy.com/developers/api/push-notifications/
  - type: APIReference
    url: https://docs.cronofy.com/developers/api/push-notifications/create-channel/
- aid: cronofy:cronofy-smart-invites-api
  name: Cronofy Smart Invites API
  description: Calendar invites tracked without calendar authorization.
  humanURL: https://docs.cronofy.com/developers/api/calendars/
  baseURL: https://api.cronofy.com/v1
  tags:
  - Smart Invites
  properties:
  - type: OpenAPI
    url: openapi/cronofy-smart-invites-api-openapi.yml
  - type: Documentation
    url: https://docs.cronofy.com/developers/api/calendars/
  - type: APIReference
    url: https://docs.cronofy.com/developers/api/
  - type: PostmanCollection
    url: collections/cronofy.postman_collection.json
  - type: OpenCollection
    url: collections/cronofy.opencollection.json
  - type: Documentation
    url: https://docs.cronofy.com/developers/api/events/
  - type: APIReference
    url: https://docs.cronofy.com/developers/api/events/free-busy/
  - type: Documentation
    url: https://docs.cronofy.com/developers/api/scheduling/
  - type: APIReference
    url: https://docs.cronofy.com/developers/api/scheduling/availability/
  - type: Documentation
    url: https://docs.cronofy.com/developers/api/smart-invites/
  - type: APIReference
    url: https://docs.cronofy.com/developers/api/smart-invites/create-smart-invite/
  - type: Documentation
    url: https://docs.cronofy.com/developers/api/scheduling/real-time-scheduling/
  - type: APIReference
    url: https://docs.cronofy.com/developers/api/scheduling/
  - type: Documentation
    url: https://docs.cronofy.com/developers/api/push-notifications/
  - type: APIReference
    url: https://docs.cronofy.com/developers/api/push-notifications/create-channel/
common:
- type: AgenticAccess
  url: agentic-access/cronofy-agentic-access.yml
- type: DomainSecurity
  url: security/cronofy-domain-security.yml
- type: Authentication
  url: authentication/cronofy-authentication.yml
- type: GitHubOrganization
  url: https://github.com/cronofy
- type: LinkedIn
  url: https://www.linkedin.com/company/cronofy
- type: Website
  url: https://www.cronofy.com
- type: Documentation
  url: https://docs.cronofy.com/developers/
- type: Plans
  url: plans/cronofy-plans-pricing.yml
- type: RateLimits
  url: rate-limits/cronofy-rate-limits.yml
- type: FinOps
  url: finops/cronofy-finops.yml
- url: https://www.cronofy.com/blog
  type: Blog
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for providers

9 MCP tools reach this

find_providersBrowse and filter every provider in the catalog.
get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools →

Call it yourself

curl for this page

This provider

curl "https://apis.io/api/v1/providers/cronofy"

All providers

curl "https://apis.io/api/v1/providers?limit=25"

Every operation they expose

curl "https://apis.io/api/v1/providers/cronofy/operations?limit=25"

How their score was established

curl "https://apis.io/api/v1/providers/cronofy/evidence"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.