Compare software

OneCalendarGoogle Calendar
Free

Free to download from the app stores.

 Free

Free with a Google account.

Windows, macOS, Android, iOS Web
  • Supports Google, Outlook, Exchange, iCloud, CalDAV and many other providers
  • Available on Android, iPhone, iPad, Mac and Windows
  • Free to use
  • Syncs across devices
  • Closed source
  • No Linux version
  • Requires a Google account
  • Data is stored on Google's servers
Downloadable app Web application, Hosted service
Closed source Closed source
License not stated License not stated
Not stated if an account is needed Account needed
Works offline Not stated if it works offline

Checked October 2, 2026

Checked September 23, 2026

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