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OneCalKeeper.sh
Freemium

Free to start with no credit card required.

 Freemium

Hosted Pro costs $5; self-hosting is free and includes every Pro feature.

Android, iOS, Web Web, Self-hosted
  • Real-time sync across Google, Outlook and iCloud
  • Control over which event details are copied
  • Works with Google, Outlook, iCloud, Fastmail and CalDAV as source or destination
  • Privacy controls hide event details in the copies
  • Requires granting a third-party service access to your calendars
  • Hosted only, with no self-hosted option
  • iCal and ICS links can only be pulled, not written to
  • Self-hosting requires registering your own Google and Microsoft sign-in apps
Downloadable app, Hosted service Web application, Self-hosted, Hosted service
Closed source Open source
License not stated License: AGPL-3.0
Account needed Not stated if an account is needed
Not stated if it works offline Not stated if it works offline

Checked October 2, 2026

Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.