Compare software

Google Calendar vs Calendar 366: catalog facts
Google Calendar	Calendar 366
Free Free with a Google account.	Freemium Subscriptions are sold through the App Store; check the site for current pricing.
Web	macOS, iOS
Free to use Syncs across devices	Events and tasks shown together in one calendar Natural-language event entry
Requires a Google account Data is stored on Google's servers	Apple platforms only Pricing details are not stated on the homepage
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	Not stated if it 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.