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Calendr vs Dato: catalog facts
Calendr	Dato
Free The open-source software is available without a license fee. Hosting, hardware and…	Paid One-time purchase on the App Store with updates included.
macOS	macOS
Supports quick event entry with natural-language dates.	Calendar, events and world clocks in one menu bar item Fullscreen meeting notifications
Requires macOS calendar access for event integration.	macOS only Paid app
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.