Applications › Calendar & Contacts

Calendar & Contacts

What 7 leading Calendar & Contacts apps are built on: the providers each one ships in its code or lists as an integration, grouped by layer and capability, and joined to the catalog.

7 reference apps 49 providers 17 observed in code 32 declared only 98.0% in the catalog 43.1 mean Kin Score 19 with a verified MCP server
How to read this. observed the integration ships in the app (SDK in a dependency file, source code, or an Android build analysis). declared the app names the integration itself (README, integrations page, store listing). Every row links the source it was read from. Providers not yet in the catalog are marked queued for profiling. Blueprint by API Evangelist, CC BY-NC-SA 4.0. Capabilities marked Turbo EA come from Turbo EA Capabilities by Vincent Verdet, CC BY 4.0 (notice); those marked API Evangelist extension are CC BY-NC-SA 4.0.

domain layer 6 capabilities
Mailbox & Calendar Sync 17 providers · AE-150.80 · API Evangelist extension

Mailbox & Calendar Sync capability

ProviderEvidenceAppsKin ScoreAgent readinessMCP
Google Calendar observed [1] [2] [3] DAVx5, Fantastical, Morgen, Notion Calendar 48.8 developing 20.7 agent-aware verified
iCloud / FaceTime declared [1] [2] [3] DAVx5, Fantastical, Morgen 55.2 strong 31.9 agent-ready none found
Zoho (CalDAV) declared [1] [2] DAVx5, Morgen 63.5 strong 33.0 agent-ready verified
Yahoo (CalDAV) declared [1] [2] DAVx5, Morgen 41.4 developing 16.2 agent-aware none found
Fastmail declared [1] [2] DAVx5, Morgen 38.1 thin 17.6 agent-aware none found
Nextcloud (CalDAV) declared [1] [2] DAVx5, Morgen 31.3 thin 19.0 agent-aware none found
fruux (CalDAV) declared [1] [2] DAVx5, Morgen 29.3 thin 0.0 human-only —
Google Contacts observed [1] DAVx5 45.6 developing 24.6 agent-aware verified
Outlook Calendar / Outlook Email declared [1] Morgen 65.9 strong 48.6 agent-ready verified
Exchange declared [1] Fantastical 58.7 strong 30.5 agent-ready none found
Microsoft 365 declared [1] Fantastical 39.4 developing 23.9 agent-aware verified
mailbox.org declared [1] DAVx5 23.4 emerging 30.6 agent-ready unknown
GMX (mail) declared [1] DAVx5 19.0 emerging 2.9 human-only none found
Posteo declared [1] DAVx5 16.5 emerging 0.0 human-only none found
Infomaniak declared [1] DAVx5 14.6 emerging 13.7 agent-aware verified
Baikal declared [1] DAVx5 9.5 minimal 2.5 human-only —
Radicale declared [1] DAVx5 7.6 minimal 2.5 human-only —
Video Calling 8 providers · AE-150.60 · API Evangelist extension

Video Calling capability

ProviderEvidenceAppsKin ScoreAgent readinessMCP
Webex declared [1] [2] [3] Fantastical, Morgen, Notion Calendar 64.1 strong 61.1 agent-ready verified
Microsoft Teams declared [1] [2] [3] Fantastical, Morgen, Notion Calendar 56.2 strong 34.2 agent-ready none found
Zoom declared [1] [2] [3] Fantastical, Morgen, Notion Calendar 56.2 strong 55.2 agent-ready verified
Google Meet declared [1] [2] [3] Fantastical, Morgen, Notion Calendar 27.7 thin 17.2 agent-aware none found
Whereby declared [1] Notion Calendar 52.2 developing 20.7 agent-aware none found
Doxy.me declared [1] Notion Calendar 24.3 emerging 0.0 human-only —
Around declared [1] Notion Calendar 0.0 minimal 0.0 human-only none found
BlueJeans queued for profiling declared [1] Notion Calendar — — —
Personal Task & To-Do Lists 3 providers · AE-923 · API Evangelist extension
ProviderEvidenceAppsKin ScoreAgent readinessMCP
Todoist declared [1] [2] Fantastical, Morgen 55.7 strong 22.6 agent-aware verified
Google Tasks declared [1] Morgen 47.0 developing 27.1 agent-aware none found
Microsoft To Do declared [1] Morgen 37.0 thin 19.6 agent-aware none found
Project Management 4 providers · BC-900.30 · Turbo EA

Project Management capability

ProviderEvidenceAppsKin ScoreAgent readinessMCP
ClickUp declared [1] Morgen 72.5 exemplar 57.0 agent-ready verified
Notion declared [1] Morgen 67.2 exemplar 54.9 agent-ready verified
Linear declared [1] Morgen 38.1 thin 35.5 agent-ready verified
Obsidian declared [1] Morgen 34.3 thin 30.2 agent-ready none found
Knowledge Management 1 providers · BC-830 · Turbo EA

Knowledge Management capability

ProviderEvidenceAppsKin ScoreAgent readinessMCP
Notion declared [1] Notion Calendar 67.2 exemplar 54.9 agent-ready verified
Weather & Environment 1 providers · AE-230.10 · API Evangelist extension

Weather & Environment capability

ProviderEvidenceAppsKin ScoreAgent readinessMCP
AccuWeather declared [1] Fantastical 42.6 developing 25.5 agent-aware none found

common layer 8 capabilities
Social & Federated Login 7 providers · AE-160.10.30 · API Evangelist extension
ProviderEvidenceAppsKin ScoreAgent readinessMCP
GitHub observed [1] Monica 81.8 exemplar 63.4 agent-ready verified
LinkedIn observed [1] Monica 74.8 exemplar 44.4 agent-ready none found
Microsoft (Azure) observed [1] Monica 60.0 strong 26.4 agent-aware none found
Facebook observed [1] Monica 42.7 developing 28.2 agent-aware none found
Google sign-in observed [1] Monica 36.8 thin 19.6 agent-aware none found
Keycloak observed [1] Monica 35.3 thin 17.6 agent-aware none found
Kanidm observed [1] Monica 10.4 minimal 0.0 human-only none found
Observability Management 2 providers · BC-4220.20 · Turbo EA

Observability Management capability

ProviderEvidenceAppsKin ScoreAgent readinessMCP
Sentry observed [1] Monica 80.6 exemplar 50.2 agent-ready verified
Laravel Nightwatch observed [1] Monica 71.2 exemplar 39.6 agent-ready verified
Search and Discovery Management 2 providers · BC-830.20.30 · Turbo EA
ProviderEvidenceAppsKin ScoreAgent readinessMCP
Meilisearch observed [1] Monica 52.0 developing 24.4 agent-aware verified
Typesense observed [1] Monica 38.8 thin 47.9 agent-ready verified
Base Map Tiles 1 providers · AE-120.20.10 · API Evangelist extension
ProviderEvidenceAppsKin ScoreAgent readinessMCP
Mapbox observed [1] Monica 47.7 developing 45.8 agent-ready verified
Forward Geocoding 1 providers · AE-120.10.10 · API Evangelist extension
ProviderEvidenceAppsKin ScoreAgent readinessMCP
LocationIQ observed [1] Monica 5.6 minimal 0.0 human-only none found
Image Processing & Optimisation 1 providers · AE-170.30.10 · API Evangelist extension
ProviderEvidenceAppsKin ScoreAgent readinessMCP
Uploadcare observed [1] Monica 37.1 thin 33.7 agent-ready none found
WhatsApp & OTT Messaging 1 providers · AE-150.20.20 · API Evangelist extension
ProviderEvidenceAppsKin ScoreAgent readinessMCP
Telegram observed [1] Monica 38.0 thin 19.6 agent-aware none found
Workflow Automation & iPaaS 1 providers · AE-910 · API Evangelist extension
ProviderEvidenceAppsKin ScoreAgent readinessMCP
Zapier declared [1] Morgen 73.7 exemplar 66.2 agent-ready verified

Reference apps

Fantastical commercial

https://flexibits.com/fantastical

0 observed · 10 declared
  • declared lists AccuWeather as an integration source
  • declared lists Exchange as an integration source
  • declared lists Google Calendar as an integration source
  • declared lists Google Meet as an integration source
  • declared lists iCloud / FaceTime as an integration source
  • declared lists Microsoft 365 as an integration source
  • declared lists Microsoft Teams as an integration source
  • declared lists Todoist as an integration source
  • declared lists Webex as an integration source
  • declared lists Zoom as an integration source

Read from: integrations page

Morgen commercial

https://www.morgen.so/

0 observed · 20 declared
  • declared lists Apple Calendar / iCloud / Apple Reminders as an integration source
  • declared lists ClickUp as an integration source
  • declared lists Fastmail as an integration source
  • declared lists fruux (CalDAV) as an integration source
  • declared lists Google Calendar as an integration source
  • declared lists Google Meet as an integration source
  • declared lists Google Tasks as an integration source
  • declared lists Linear as an integration source
  • declared lists Microsoft Teams as an integration source
  • declared lists Microsoft To Do as an integration source
  • declared lists Nextcloud (CalDAV) as an integration source
  • declared lists Notion as an integration source
  • declared lists Obsidian as an integration source
  • declared lists Outlook Calendar / Outlook Email as an integration source
  • declared lists Todoist as an integration source
  • declared lists Webex as an integration source
  • declared lists Yahoo (CalDAV) as an integration source
  • declared lists Zapier as an integration source
  • declared lists Zoho (CalDAV) as an integration source
  • declared lists Zoom as an integration source

Read from: integrations page

Notion Calendar commercial

https://www.notion.com/product/calendar

0 observed · 10 declared
  • declared lists Around as an integration source
  • declared lists BlueJeans as an integration source
  • declared lists Doxy.me as an integration source
  • declared lists Google Calendar as an integration source
  • declared lists Google Meet as an integration source
  • declared lists Microsoft Teams as an integration source
  • declared lists Notion as an integration source
  • declared lists Webex as an integration source
  • declared lists Whereby as an integration source
  • declared lists Zoom as an integration source

Read from: integrations page

DAVx5 open-source-saas

https://github.com/bitfireAT/davx5-ose

2 observed · 12 declared
  • observed ships the Google Calendar SDK or integration code source
  • observed ships the Google Contacts SDK or integration code source
  • declared lists Baikal as an integration source
  • declared lists Fastmail as an integration source
  • declared lists fruux as an integration source
  • declared lists GMX (mail) as an integration source
  • declared lists iCloud as an integration source
  • declared lists Infomaniak as an integration source
  • declared lists mailbox.org as an integration source
  • declared lists Nextcloud as an integration source
  • declared lists Posteo as an integration source
  • declared lists Radicale as an integration source
  • declared lists Yahoo as an integration source
  • declared lists Zoho as an integration source

Read from: Android build analysis (Exodus Privacy, reports.exodus-privacy.eu.org), dependency manifest, documentation, source code

Monica self-hosted

https://github.com/monicahq/monica

15 observed · 0 declared
  • observed ships the Facebook SDK or integration code source
  • observed ships the GitHub SDK or integration code source
  • observed ships the Google sign-in SDK or integration code source
  • observed ships the Kanidm SDK or integration code source
  • observed ships the Keycloak SDK or integration code source
  • observed ships the Laravel Nightwatch SDK or integration code source
  • observed ships the LinkedIn SDK or integration code source
  • observed ships the LocationIQ SDK or integration code source
  • observed ships the Mapbox SDK or integration code source
  • observed ships the Meilisearch SDK or integration code source
  • observed ships the Microsoft (Azure) SDK or integration code source
  • observed ships the Sentry SDK or integration code source
  • observed ships the Telegram SDK or integration code source
  • observed ships the Typesense SDK or integration code source
  • observed ships the Uploadcare SDK or integration code source

Read from: dependency manifest, source code

Radicale self-hosted

https://github.com/Kozea/Radicale

0 observed · 0 declared

    Read from: source code

    Where these apps are listed

    See also the shared layer under every category.