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Google Calendar vs OneCalendar: catalog facts
Google Calendar	OneCalendar
Free Free with a Google account.	Free Free to download from the app stores.
Web	Windows, macOS, Android, iOS
Free to use Syncs across devices	Supports Google, Outlook, Exchange, iCloud, CalDAV and many other providers Available on Android, iPhone, iPad, Mac and Windows
Requires a Google account Data is stored on Google's servers	Closed source No Linux version
Web application, Hosted service	Downloadable app
Closed source	Closed source
License not stated	License not stated
Account needed	Not stated if an account is needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 2, 2026

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