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Calendr vs BusyCal: catalog facts
Calendr	BusyCal
Free The open-source software is available without a license fee. Hosting, hardware and…	Paid Costs $49.99 USD after a free 14-day trial, and is also included in Setapp.
macOS	macOS, iOS
Supports quick event entry with natural-language dates.	Works with iCloud, Google, Exchange and CalDAV Highly customizable views including a Year Planner
Requires macOS calendar access for event integration.	Apple platforms only Paid after the trial
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 September 23, 2026

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