established · -0.7 capabilitymarket resourcedomain

Calendar

Score 24.4 / 100 97 providers +125 via APIs 167 APIs Search apis.io →
Business capabilities this tag reaches
Consumer Travel, Events & Local Services 3 Data & Reference Information Services 1 Travel Revenue & Yield Management 1 Patient Access Management 1 Payments & Card Management 1 Application Communications 1
Variants seen in the corpus: CalendarsCalendar

Providers using this tag (97)

Ranked by API Evangelist rating — Exemplar and Strong are expanded by default.

Exemplar 9 Complete, well-documented, and agent-ready
NylasCommunicationsContactsEmail2 APIs93.9Amazon WorkMailAmazon Web ServicesBusiness CommunicationEmail3 APIs72.1Microsoft OutlookContactsEmailEnterprise2 APIs70.8Google WorkspaceCollaborationEmailProductivity12 APIs70.7ChronarySchedulingAI AgentsWebhook1 API67.8EventwrenAgentsMCPEvent3 APIs89.7Microsoft 365ProductivityCollaborationEmail7 APIs76.1CycleCalcsAstronomySpaceScienceEphemeris1 API70.4Chili PiperSchedulingLead RoutingMeetingsSales19 APIs68.1
Strong 9 Solid coverage with minor gaps
AddEventIntegrationMarketingSoftware-as-a-Service1 API65.2Microsoft ExchangeCollaborationContactsEmail6 APIs64.9Google CalendarAvailabilityEventGoogle9 APIs64.6workwae-comCompanyEmailContacts1 API55.8ComingUp TodayCompanyFamily OrganizationList1 API55.7CalendarificPublic APIsHolidaysWorldwide1 API55.4Business BoxCompanyBookingPayments1 API54.7YoxelCompanyIntegrationEmail1 API54.6Microsoft BookingsBookingSchedulingAppointmentsMicrosoft Graph2 APIs59.7
Developing 10 Usable, with meaningful gaps to close
BusyBoardSchedulingPrivacyFree1 API51.3crosswalkAI AgentsMessage boardsEmail1 API48.3API Calendrier Marocain | Jours Fériés & Ouvrables REST + SDK PythonHolidaysMoroccoBusiness Days2 APIs45.5Reclaim.aiArtificial IntelligenceSchedulingProductivity1 API41.8AllMyMeetingsSyncArtificial IntelligenceProductivity1 API39.8CoinMarketCalCryptocurrencyEventData1 API39.5MeetsMoreCompanyMarketplaceLocal ServicesHome Services2 APIs48.0CalendlyAppointmentsAutomationBooking1 API47.5Holiday APIHolidaysPublic HolidaysObservances1 API46.0Checkiday - National Holiday and Event APIHolidaysEventObservances1 API43.7
Thin 21 Limited public surface area
bankday-devCompanyFinancePayments1 API38.6meettempi-comCompanySchedulingArtificial Intelligence1 API37.2SavvyCalSchedulingAppointmentsAvailability1 API36.7Zoho MailEmailMailCollaborationMessaging1 API35.9BrutForce TechnologiesCompanyIntegrationStartups35.0DayPilotSchedulerGantt ChartUI Components1 API34.6AlfredArtificial IntelligenceProductivityEmail1 API33.6AddCalEvent ManagementSoftware-as-a-ServiceIntegration31.6CalendarBridgeCompanySchedulingIntegration1 API31.4CronofySchedulingAvailabilityBooking1 API30.2AkiflowProductivityTask ManagementTime Blocking1 API30.0Acuity SchedulingAppointment SchedulingBookingScheduling1 API29.6LawToolBoxLegal TechMatter ManagementMicrosoft 3652 APIs29.6fruuxSyncContactsTask1 API27.9CalendarMCPArtificial IntelligenceMCPGoogle Calendar2 APIs27.4AmieCompanyConsumerProductivity27.3GeometryArtificial IntelligenceDateJSONRAG2 APIs27.3ZimbraEmailCollaborationMessaging1 API26.2Cal.comProductivitySchedulingOpen Source1 API37.7DaycalSchedulingAI AssistantProductivity1 API34.0LumaEventEvent ManagementTicketingCommunity1 API33.9
Emerging 23 Early or largely undocumented
TickTickCompanyProductivityTask Management25.5NorishCompanyRecipesMeal PlanningGroceries1 API24.7SpurwingSchedulingAppointmentsBooking1 API23.7Consistency CalendarArtificial IntelligenceProductivityGoal-SettingHabit-Formation1 API22.9Mediakreativ UGCompanyCalDAVSync1 API22.1Giornata MondialeCompanyEducationCulture1 API21.2Higgs HubEmail1 API20.0Fantastical (Flexibits)CompanyProductivitymacOS19.8SupafaxCompanyEmailAI Assistant18.6CalfeedProductivitySchedulingWeb App18.4Blockit AICompanyArtificial IntelligenceSchedulingProductivity18.2CalensyncSyncAutomationSoftware-as-a-Service1 API16.8TownCompanyArtificial IntelligenceAgentsPersonal Assistant15.5CronCompanyConsumerScheduling13.5CabinetCompanySchedulingExecutive Assistant12.8SaturnCompanySchedulingConsumer11.0Event SynopticEventLos AngelesEntertainment2 APIs25.7VelaCompanySchedulingArtificial IntelligenceAI Agents18.9ZcalSchedulingBookingMeetings1 API18.3DoodleSchedulingMeetingsGroup Polls1 API17.9PlainlyKit — Date APICompanyDateFree1 API13.6UK Bank HolidaysPublic APIs1 API13.6QuietaFamily CoordinationKids ActivitiesWall Mode1 API11.4
Minimal 25 Almost no public developer surface
Daily CalendarCompanyPanchangIndian1 API9.9Hebrew CalendarPublic APIs1 API7.3Hindu CalendarHindu CalendarFestivalsVrats7.1RadicaleCompanyCalDAVCardDAVOpen Source1 API6.7Church CalendarPublic APIs1 API4.3HunchfulFamilyArtificial IntelligenceProductivity1 API4.3LectServePublic APIs1 API4.3Namedays CalendarPublic APIs1 API4.3Russian CalendarPublic APIs1 API3.6Czech Namedays CalendarPublic APIs1 API3.3TimeBlocksCompanySchedulingProductivity3.0AcompliCompanyEmailMobileProductivity2.6BlendcalendarSchedulingArtificial IntelligenceIntegration2.2ClockwiseArtificial IntelligenceSchedulingFocus Time1 API0.0IRLCompanySocialMessagingEvent0.0Woven SoftwareCompanySchedulingProductivity0.0AWSTCompanyProductivitySchedulingDocument Management10.9BaikalCompanyOpen SourceCardDAV8.5Nager.DatePublic APIs1 API4.3Non-Working DaysPublic APIs1 API4.3Public HolidaysPublic APIs1 API4.3Festivo Public HolidaysPublic APIs1 API3.8Non-Working DaysPublic APIs1 API3.6ScoopCompanyFuture Of WorkHybrid WorkWorkplace Scheduling3.0Gowri PanchangamAstrologyTamilTime‑classification2.2

APIs with this tag (166)

Ranked by the provider's API Evangelist rating — the Kin Score is scored per provider, not per API, so every API of a provider shares its band. How the rating works →

Exemplar 25 Complete, well-documented, and agent-ready
Nylas Calendar APIThe Nylas Calendar API allows you to create and manage calendars, and access the events they contain. Nylas...93.9Eventwren Posts APIPost event listings to Eventwren from an AI agent: submit an event listing for moderation ($1 per event, re...89.7ActiveCampaign Calendars APIThe Calendars API from ActiveCampaign — 2 operation(s) for calendars.81.1Alpaca Calendar APIThe Calendar API from Alpaca — 2 operation(s) for calendar.77.0Microsoft 365 Calendar APIMicrosoft Graph v1.0 Calendar workload, from the first-party OpenAPI module Microsoft publishes in microsof...76.1Microsoft Graph APIUnified REST API providing a single endpoint to access data and intelligence across Microsoft 365, Microsof...76.1APIVerve Calendar APIThe Calendar API from APIVerve — 5 operation(s) for calendar.73.9ZnanyLekarz Calendars APISimple operations on the calendar belonging to the address72.7AlphaAI Calendar APIScheduled US macro releases (FOMC, CPI, jobs, GDP, PCE…).72.2Sifflet Calendars APIThe Calendars API from Sifflet — 2 operation(s) for calendars.71.4Google Calendar APICreate and manage calendars, events, and attendees.70.7Microsoft Calendar APIAccess and manage Outlook calendar events70.5CycleCalcs MCP ServerHosted stateless Streamable HTTP MCP server exposing 11 astronomy tools backed by the v2 REST endpoints. To...70.4Microsoft Office 365 Calendar APIAccess and manage Outlook calendar events, calendars, and calendar groups. Supports scheduling, meeting man...70.1Outlook Calendar APIAccess and manage calendar events, meeting requests, and calendar groups.70.1Outlook Mail APIAPI for accessing and managing email, calendar, contacts, and tasks in Outlook.70.1Unified.to Calendar APIThe calendar API from Unified.to — 11 operation(s) for calendar.69.4Cisco XDR Calendars APIThe Calendars API from Cisco XDR — 3 operation(s) for calendars.68.9Google Calendars APIOperations related to Calendars68.9Conduyt Calendar APIThe Calendar API from Conduyt — 1 operation(s) for calendar.68.6Conduyt Calendars APIInternal calendar and appointment management68.6postproxy-dev Calendar APIPublic scheduled-posts calendar68.3Chronary Calendars APIThe Calendars API from Chronary — 4 operation(s) for calendars.67.8HighLevel Calendars APIDocumentation for Calendars API66.9Nordlet Calendar APIThe calendar API from Nordlet — 7 operation(s) for calendar.66.7
Strong 32 Solid coverage with minor gaps
AddEvent Calendars APIThe Calendars API from AddEvent — 2 operation(s) for calendars.65.2Microsoft Exchange Calendars APIOperations for managing calendars64.9Aidelly AI Calendar APIThe Calendar API from Aidelly AI — 5 operation(s) for calendar.64.8AccuLynx Calendar APIManage company calendars and their appointments.64.7Google Calendar Calendars APIThe Calendars API from Google Calendar — 6 operation(s) for calendars.64.6Zoho CalendarThe Zoho Calendar API provides REST endpoints to customize calendar features, allowing you to manage calend...63.7Bentley Systems Calendars APICalendars resources for the iTwin Schedules API.63.32s Calendar APIThe calendar API from 2s — 4 operation(s) for calendar.62.7Fivexer Calendar APIThe calendar API from Fivexer — 1 operation(s) for calendar.61.4Forward Email Calendars APIAlias calendars management endpoints (CalDAV) >[!NOTE] > Unlike other API endpoints, these require [Authent...61.3ThetaData Calendar APIThe Calendar API from ThetaData — 3 operation(s) for calendar.61.3Clear Street Calendar APIAccess clocks and financial calendars for market sessions and events.60.7EODHD Calendar APICalendar events including earnings, IPOs, splits, dividends, and trends60.7EODHD Economic Events Calendar APIProvides a global economic calendar of macroeconomic releases including country, event name, scheduled time...60.7Convo Calendar APIUpcoming events from your connected Google or Outlook calendar60.0BuildWorkPro Calendar APIScheduled events derived from project phases, tasks and bid deadlines.59.9Charthop Calendar APIThe calendar API from Charthop — 10 operation(s) for calendar.59.9FOLIO Calendar APIThe Calendar API from FOLIO — 4 operation(s) for calendar.58.6Wispr AI Calendar APIThe Calendar API from Wispr AI — 6 operation(s) for calendar.57.7KISI Calendars APIThe Calendars API from KISI — 1 operation(s) for calendars.57.6Coach Watts Calendar APIThe Calendar API from Coach Watts — 1 operation(s) for calendar.57.5Zoom Calendar APIThe Zoom Calendar API enables developers to manage calendar events, automate scheduling, sync across platfo...57.1Astrocal Calendars APIThe Calendars API from Astrocal — 7 operation(s) for calendars.56.5Akeda Calendar APIМодуль calendar (события, занятость и внешняя синхронизация)56.4Microsoft Project Calendars APIManage enterprise calendars56.3unipile-com Calendars APICalendars management56.1Blue Prism Calendars APIThe Calendars API from Blue Prism — 8 operation(s) for calendars.55.9DataQuoll Calendars APIIndustry calendars for NSW, VIC, QLD, WA, SA, TAS, ACT and NT: RDOs, public holidays, school holidays and s...55.8ComingUp Today Calendars APIThe Calendars API from ComingUp Today — 6 operation(s) for calendars.55.7Everbridge Calendars APIEB Suites - Calendars Management55.5Yoxel Calendars APIEach account connected to Aurino can have zero or more calendars, and each calendar has a collection of ind...54.6Apptoto Calendars APIThe Calendars API from Apptoto — 1 operation(s) for calendars.54.3
Developing 46 Usable, with meaningful gaps to close
Ritten Calendar APIThe calendar API from Ritten — 2 operation(s) for calendar.54.2Kumospace Calendar APIThe Calendar API from Kumospace — 7 operation(s) for calendar.54.1openephemeris-com Calendar APIMark the turning of the wheel. Cross-quarter days, exact moon phases, and lunar standstills. **10 units per...54.1SoftSync AI Calendar APIThe Calendar API from SoftSync AI — 3 operation(s) for calendar.54.0FXMacroData Calendar APIStandalone economic and policy release calendar endpoint spanning announcements and central-bank decision t...53.8Deadsimple Email Calendar APIThe Calendar API from Deadsimple Email — 8 operation(s) for calendar.53.7SAP BI Tools Calendars APIManage calendar events and tasks used for planning workflows and scheduling in SAP Analytics Cloud.53.7SIC Clearing Day Calendar APIScheduling information for the electronic payment services provided by SIX Interbank Clearing Ltd - clearin...53.4roic-ai Calendar APIDated company event resources such as the earnings calendar.53.2Clio Calendars APICalendars contain Calendar Entries. All Clio accounts contain one firm Calendar ("AccountCalendar"), person...51.7Attrove Calendars APIThe Calendars API from Attrove — 2 operation(s) for calendars.51.6VaultRE Calendar APIOperations related to calendar events50.9KolayIK Calendar APIThe Calendar API from KolayIK — 5 operation(s) for calendar.50.8Court Delta Calendar APIThe Calendar API from Court Delta — 1 operation(s) for calendar.50.6commodities.sh Calendar APIThe Calendar API from commodities.sh — 1 operation(s) for calendar.50.4Fulcra Calendars APIThe calendars API from Fulcra — 2 operation(s) for calendars.50.4CCP Games Calendar APIThe Calendar API from CCP Games — 3 operation(s) for calendar.49.6Chatinbox Calendar APIThe Calendar API from Chatinbox — 1 operation(s) for calendar.49.4Trakt Calendars APIUpcoming and recently aired schedules for shows, episodes, and movies.48.6Clearstreet8e71 Calendar APIAccess clocks and financial calendars for market sessions and events.48.4Nittei Scheduler APINittei is MeetsMore's self-hosted calendar and scheduler server, written in Rust (Axum + SQLx + PostgreSQL)...48.0wakato-io Calendar APIThe Calendar API from wakato-io — 2 operation(s) for calendar.47.9Moment Calendar APIThe Calendar API from Moment — 1 operation(s) for calendar.47.7ASAP Calendar APIAgenda: native events (recurrence, attendees, invitations) and the read-only projection of every dated dead...47.5TreasurySpring Calendar APIGet Calendar information47.5EarningsCall APIProvides earnings call transcripts, audio, slide decks, and event data.47.0EarningsCall Calendar APIThe Calendar API from EarningsCall — 1 operation(s) for calendar.47.0GuestReady Calendar APIThe calendar API from GuestReady — 2 operation(s) for calendar.46.9Kairon Calendar APIThe calendar API from Kairon — 2 operation(s) for calendar.45.8DATPAQ Calendar APIMonth, day, and range calendars with optional public-holiday overlays45.5EVE Online Calendar APIThe Calendar API from EVE Online — 6 operation(s) for calendar.45.2shirabe-dev Calendar API暦情報の取得45.2Aiera Calendar APIThe Calendar API from Aiera — 3 operation(s) for calendar.44.9CrunchDAO Calendar APIThe calendar API from CrunchDAO — 2 operation(s) for calendar.44.6Statistics Finland Calendar APIThe Calendar API from Statistics Finland — 1 operation(s) for calendar.44.6Reonic Calendars APIReonic-hosted calendars only. External calendar integrations (Google, Microsoft) are visible inside the Reo...44.5Hostaway Calendar APIRead and update the per-listing availability and nightly pricing calendar. Supports per-day retrieval, batc...44.4airbnb Calendar APIOperations for managing listing availability, pricing, and calendar synchronization across platforms.44.1Mantic Calendar APIThe calendar API from Mantic — 5 operation(s) for calendar.42.5Magic Moment Calendars APIThe calendars API from Magic Moment — 4 operation(s) for calendars.42.4Reclaim.ai Calendars APIThe calendars API from Reclaim.ai — 20 operation(s) for calendars.41.8Xignite Earnings Calendar APICompany earnings announcement dates and earnings calendar data from the earningscalendar.xignite.com service.41.8Xignite Global Holidays APIExchange trading hours, market holidays, and calendar data for global exchanges from the globalholidays.xig...41.8Bitrix24 Calendar APIThe Calendar API from Bitrix24 — 21 operation(s) for calendar.41.7Bitrix24 REST APITenant-scoped REST API for managing CRM entities, deals, leads, tasks, calendars, telephony, disk files, us...41.7University of Warsaw Calendar APIAcademic calendar events41.0
Thin 36 Limited public surface area
bankday-dev Calendars APIThe Calendars API from bankday-dev — 1 operation(s) for calendars.38.6FiatDock Calendar APIThe Calendar API from FiatDock — 1 operation(s) for calendar.38.2Charter Captain Calendar APIThe Calendar API from Charter Captain — 3 operation(s) for calendar.38.1Cal.com Calendars APIThe Calendars API from Cal.com — 9 operation(s) for calendars.37.7Cal.com REST API v2REST API providing full programmatic control over Cal.com resources including calendars, event types, booki...37.7Indian Institute of Technology Bombay Calendar APIThe calendar API from Indian Institute of Technology Bombay — 11 operation(s) for calendar.37.7EPFL Memento Events APIEPFL's public events and agenda API, serving the Memento calendar — events, mementos, registrations, domain...37.6Purdue Events Calendar API (Localist tenant)Purdue's public events calendar at events.purdue.edu serves a live JSON events API on the Localist v2 contr...37.0FilingAPI Calendar APIThe Calendar API from FilingAPI — 3 operation(s) for calendar.36.6CoSchedule MCP ServerRemote MCP (Model Context Protocol) server that lets Claude and ChatGPT read a user's CoSchedule calendars,...35.9FinanceKey Calendars APIThe Calendars API from FinanceKey — 21 operation(s) for calendars.35.8UF Events Calendar (LiveWhale tenancy)The UF events calendar runs on LiveWhale Calendar. calendar.ufl.edu CNAMEs to ufl-prod.lwcal.com — again a ...35.4Crosby News Calendar APIThe Calendar API from Crosby News — 1 operation(s) for calendar.35.3Guesty Calendars APIListing availability and pricing34.9Fantasy Pundit Calendar APIAccount-free league calendar subscription.34.3Luma Calendars APIThe Calendars API from Luma — 25 operation(s) for calendars.33.9Planning Center Calendar APIChurch calendaring, events, and facility resources.33.9DalalOS APIDalalOS API as documented publicly: 47 operations. Contract generated from the documentation by API Evangel...33.5Stalwart HTTP overview APIStalwart HTTP overview API as documented publicly: 19 operations. Contract generated from the documentation...32.6Sonarr Calendar APIThe Calendar API from Sonarr — 4 operation(s) for calendar.32.5Dapta APIDapta API as documented publicly: 35 operations. Contract generated from the documentation by API Evangelis...32.3Dynamite Circle Calendar APIThe Calendar API from Dynamite Circle — 1 operation(s) for calendar.32.1Cornell Events Calendar API (Localist) — tenantThe Cornell events calendar at events.cornell.edu answers a live JSON API at /api/2/events, and the data is...32.0Fountain Hire API v2REST API for the Fountain Hire product, covering applicants (create, retrieve, update, delete, list, latest...31.9Shanghai Jiao Tong University Calendar APICalendar event synchronisation into the campus calendar.31.8Cronofy Calendars APIConnected calendars, application calendars, and account identity.30.2Webex Hybrid Services APIManage Webex Hybrid Calendar, Hybrid Call Service, Hybrid Message, Video Mesh nodes, and other connectors t...29.7Acuity Scheduling REST API v1REST API for managing appointments, appointment types, clients, calendars, availability, intake forms, prod...29.6AegeanBot Calendar APIThe Calendar API from AegeanBot — 2 operation(s) for calendar.28.5D2L Brightspace Calendar APICourse calendar events.28.3Eshway Calendar APIThe calendar API from Eshway — 6 operation(s) for calendar.28.1EDI Central Bank Calendar APICentral bank meeting and announcement calendar via the GetLatestCentralBankCalendar endpoint.27.3EDI Economic Calendar APIForward-looking economic calendar events via the GetLatestEconomicCalendar endpoint.27.3TableCheck Calendar APIThe calendar API from TableCheck — 1 operation(s) for calendar.27.3Hospitable Calendar APINightly availability, pricing, and restrictions per property.26.8PetExec Calendar APICompany-wide and per-owner reservation calendars by date range.26.6
Emerging 11 Early or largely undocumented
Fly Frugal Calendar APIThe Calendar API from Fly Frugal — 1 operation(s) for calendar.25.8GroupWise Web Services (SOAP)Server-side SOAP protocol for reading and writing a GroupWise user's mailbox, spoken directly to the GroupW...25.6Norish Recipe APIThe HTTP API each Norish instance serves under /api/v1, covering a public health check plus authenticated r...24.71gateway Calendar APIThe Calendar API from 1gateway — 1 operation(s) for calendar.24.3Uplisting Calendar APIAvailability, prices, and restrictions per property and date.23.4Vetspire Schedule & Appointments APIGraphQL operations over the Schedule domain - list appointments for a location and date range, read provide...21.4Giornata Mondiale Calendar APIThe Calendar API from Giornata Mondiale — 1 operation(s) for calendar.21.2Horoscope API Calendar APILocation-based daily calendar and Sun/Moon data.19.4Is It Deprecated Calendar APIThe Calendar API from Is It Deprecated — 1 operation(s) for calendar.16.4UK Bank HolidaysBank holidays in England and Wales, Scotland and Northern Ireland13.6Dentrix Appointments & Scheduling APIRead the schedule and book, reschedule, or cancel appointments. In the Dentrix Developer Program this maps ...11.1
Minimal 16 Almost no public developer surface
HireVue Coordinate (Scheduling) APIAutomated interview scheduling and coordination across candidate and interviewer calendars. Supports self-s...9.2CEPS Events ListingsCEPS maintains a public calendar of policy events, conferences, task force meetings, roundtables and webina...8.2Hebrew CalendarConvert between Gregorian and Hebrew, fetch Shabbat and Holiday times, etc7.3LEAP Calendar APIModeled calendar/diary and appointment-scheduling surface, evidenced by production Marketplace scheduling i...5.3Church CalendarCatholic liturgical calendar4.3LectServeProtestant liturgical calendar4.3Nager.DatePublic holidays for more than 90 countries4.3Namedays CalendarProvides namedays for multiple countries4.3Non-Working DaysSimple REST API for checking working, non-working or short days for Russia, CIS, USA and other4.3Public HolidaysData on national, regional, and religious holidays via API4.3Festivo Public HolidaysFastest and most advanced public holiday and observance service on the market3.8Non-Working DaysDatabase of ICS files for non working days3.6Russian CalendarCheck if a date is a Russian holiday or not3.6Examity Appointments (Scheduling) APICreate, reschedule, and cancel proctoring appointments for a test-taker against a registered exam, and quer...3.5Czech Namedays CalendarLookup for a name and returns nameday date3.3Clockwise REST APIREST API for the Clockwise AI calendar optimization platform, providing programmatic access to focus time m...0.0

Companies reaching this through an API (124)

These companies publish an API, specification or operation carrying “Calendar” but do not classify their business under it. Listed unranked and kept out of the count above, because one tagged operation is not a statement about what a company does.

1gateway 2s AccuLynx ActiveCampaign AegeanBot Aidelly AI Aiera Airbnb Akeda Alpaca AlphaAI APIVerve Apptoto ASAP Astrocal Attrove Bentley Systems Bitrix24 Blue Prism BuildWorkPro CCP Games CEPS (Centre for European Policy Studies) Charter Captain Charthop Chatinbox Cisco Collaboration Hybrid Solutions Cisco XDR Clear Street Clearstreet8e71 Clio Coach Watts commodities.sh Conduyt Convo Cornell University CoSchedule Court Delta Crosby News CrunchDAO D2L Brightspace DalalOS Dapta DataQuoll DATPAQ Deadsimple Email Dentrix Dynamite Circle EarningsCall EODHD EPFL
Show all 124 companies ↓
Eshway EVE Online Everbridge Examity Exchange Data International Fantasy Pundit FiatDock FilingAPI FinanceKey Fivexer Fly Frugal FOLIO Forward Email Fountain Fulcra FXMacroData Google GuestReady Guesty HighLevel HireVue Horoscope API Hospitable Hostaway Indian Institute of Technology Bombay Is It Deprecated Kairon KISI KolayIK Kumospace LEAP Magic Moment Mantic Microsoft Microsoft Office Microsoft Office 365 Microsoft Project Moment Nordlet Novell openephemeris-com PetExec Planning Center postproxy-dev Purdue University Reonic Ritten roic-ai SAP BI Tools Shanghai Jiao Tong University shirabe-dev Sifflet SIX SoftSync AI Sonarr Stalwart Statistics Finland TableCheck ThetaData Trakt TreasurySpring Unified.to unipile-com University of Florida University of Warsaw Uplisting VaultRE Vetspire wakato-io Wispr AI Xignite ZnanyLekarz Zoho Zoom

Score breakdown

Frequency
66.2
log-scaled weighted occurrences
Breadth
1.2
spread across providers
Quality lift
29.6
mean composite of providers using it
Cohesion
11.1
strength of nearest seed neighbor

Related tags

Scheduling 54 co-occurrences Meetings 22 co-occurrences Mail 16 co-occurrences Contacts 37 co-occurrences Productivity 40 co-occurrences Availability 17 co-occurrences Email 36 co-occurrences Task 34 co-occurrences

Where this tag comes from

Api tag162
Provider tag97
Openapi tag99
Openapi op tag360

Cohort brief

Auto-generated

The 83 providers in the APIs.io catalog tagged Calendar, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.

Providers
83
of 97 in the catalog
Mean Kin Score
31.5
+7.4 vs catalog 24.1
Mean Agent Readiness
20.2
+6.1 vs catalog 14.1
Spread
0–93.9
median 27.3 · σ 22.9
How the 83 split by band
Exemplar 9Strong 8Developing 10Thin 17Emerging 21Minimal 18
Facet averages, against the whole catalog
FacetThis cohortCatalogDifferenceScored
Contract Quality 28.5 18.6 +9.9 83
Access Clarity 38.4 30 +8.4 83
Developer Ergonomics 30.5 24.5 +6 83
Operational Transparency 19 13.2 +5.8 83
Contract Governance 12.9 9.7 +3.2 83
Discoverability 60.4 59.1 +1.3 83

A facet is averaged over the members that carry it, not over the whole cohort — the “Scored” column is that count. Averaging an absent facet as zero would score our own coverage gaps as the providers’ posture.

What this cohort publishes
ArtifactThis cohortCatalogDifference
MCP server (any) 28% 18% +10
MCP server (first-party) 28% 16% +12
Agent Skills 0% 0% 0
OAuth scopes 13% 13% 0
Security 100% 99% +1
Arazzo workflows 5% 1% +4
Governance rules 48% 36% +12

mcp_pct counts any mcp/ artifact including ones API Evangelist derived from the provider OpenAPI; mcp_first_party_pct counts only servers the provider publishes. Prefer the latter.

Top by Kin Score
  1. 1 Nylas 93.9
  2. 2 Eventwren 89.7
  3. 3 Microsoft 365 76.1
  4. 4 Amazon WorkMail 72.1
  5. 5 Microsoft Outlook 70.8
  6. 6 Google Workspace 70.7
  7. 7 CycleCalcs 70.4
  8. 8 Chili Piper 68.1
  9. 9 Chronary 67.8
  10. 10 AddEvent 65.2
Top by Agent Readiness
  1. 1 Eventwren 75
  2. 2 Nylas 59.6
  3. 3 Chili Piper 56.3
  4. 4 Cal.com 51.9
  5. 5 CycleCalcs 51.8
  6. 6 Luma 49.9
  7. 7 Daycal 49
  8. 8 Calendly 48.1
  9. 9 SavvyCal 48.1
  10. 10 Google Calendar 44.6
All 97 members of this roster resolve to a provider in the catalog; 83 carry a score (86%). The figures above describe the scored members only.
Coverage caveat. 59 of 83 scored members had under half their catalog-attributable points satisfied at all (catalog_earned / catalog_max < 0.5). They are INCLUDED in the mean above. A large share here means the cohort mean is partly a measurement of how far our enrichment reached, not only of how these providers publish.Generated from the catalog build of 14 November 2026, across 41591 providers, using the same computation served by the APIs.io cohort API. Briefs are published for rosters of 5 or more scored providers; below that a distribution is not meaningful.

Work with this as data

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MCP server

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https://apis.io/mcp

Tools for tags

7 MCP tools reach this
  • find_tagsBrowse and filter every tag in the catalog.
  • get_cohortThis tag as a scored cohort — every provider carrying it, with scores.
  • cohort_statsPRO — the distribution across this tag: mean, median, band split, adoption rates.
  • cohort_rankingsPRO — the leaderboard, on composite AND agent-readiness axes.
  • 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.
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