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Calendar 366 vs Calendars by Readdle: catalog facts
Calendar 366	Calendars by Readdle
Freemium Subscriptions are sold through the App Store; check the site for current pricing.	Free Free to download from the App Store and as a Mac download.
macOS, iOS	macOS, iOS
Events and tasks shown together in one calendar Natural-language event entry	Natural language event creation Calendars and tasks in one view
Apple platforms only Pricing details are not stated on the homepage	Apple platforms only No Windows or Android 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	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 1, 2026

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