Compare software

Calendar 366 vs OneCalendar: catalog facts
Calendar 366	OneCalendar
Freemium Subscriptions are sold through the App Store; check the site for current pricing.	Free Free to download from the app stores.
macOS, iOS	Windows, macOS, Android, iOS
Events and tasks shown together in one calendar Natural-language event entry	Supports Google, Outlook, Exchange, iCloud, CalDAV and many other providers Available on Android, iPhone, iPad, Mac and Windows
Apple platforms only Pricing details are not stated on the homepage	Closed source No Linux version
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

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