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OneCalendar vs BusyCal: catalog facts
OneCalendar	BusyCal
Free Free to download from the app stores.	Paid Costs $49.99 USD after a free 14-day trial, and is also included in Setapp.
Windows, macOS, Android, iOS	macOS, iOS
Supports Google, Outlook, Exchange, iCloud, CalDAV and many other providers Available on Android, iPhone, iPad, Mac and Windows	Works with iCloud, Google, Exchange and CalDAV Highly customizable views including a Year Planner
Closed source No Linux version	Apple platforms only Paid after the trial
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
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 September 23, 2026

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