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Calendar 366 vs Itsycal: catalog facts
Calendar 366	Itsycal
Freemium Subscriptions are sold through the App Store; check the site for current pricing.	Free Free download from the developer's website.
macOS, iOS	macOS
Events and tasks shown together in one calendar Natural-language event entry	Uses the events already in the Mac Calendar app Extensive keyboard controls, including Vim motions
Apple platforms only Pricing details are not stated on the homepage	macOS only, version 11 or later Depends on Calendar app accounts for event sync
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 24, 2026

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