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

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