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Calendr vs Itsycal: catalog facts
Calendr	Itsycal
Free The open-source software is available without a license fee. Hosting, hardware and…	Free Free download from the developer's website.
macOS	macOS
Supports quick event entry with natural-language dates.	Uses the events already in the Mac Calendar app Extensive keyboard controls, including Vim motions
Requires macOS calendar access for event integration.	macOS only, version 11 or later Depends on Calendar app accounts for event sync
Downloadable app	Downloadable app
Open source	Closed source
License: MIT	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 September 22, 2026	Official website Full listing and sources Checked September 24, 2026

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