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Keeper.shOneCal
Freemium

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

 Freemium

Free to start with no credit card required.

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