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