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Calendr vs Calendar 366: catalog facts
Calendr	Calendar 366
Free The open-source software is available without a license fee. Hosting, hardware and…	Freemium Subscriptions are sold through the App Store; check the site for current pricing.
macOS	macOS, iOS
Supports quick event entry with natural-language dates.	Events and tasks shown together in one calendar Natural-language event entry
Requires macOS calendar access for event integration.	Apple platforms only Pricing details are not stated on the homepage
Downloadable app	Downloadable app
Open source	Closed source
License: MIT	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 September 22, 2026	Official website Full listing and sources Checked October 2, 2026

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