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OneCalendar vs KashCal: catalog facts
OneCalendar	KashCal
Free Free to download from the app stores.	Free Free and open source with no ads.
Windows, macOS, Android, iOS	Android
Supports Google, Outlook, Exchange, iCloud, CalDAV and many other providers Available on Android, iPhone, iPad, Mac and Windows	iCloud calendar sync on Android Works with Nextcloud, Fastmail and other CalDAV servers
Closed source No Linux version	Android only Calendar only, no task or contact management in the app
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: Apache-2.0
Not stated if an account is needed	No account 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 October 2, 2026

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