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Rainlendar vs OneCalendar: catalog facts
Rainlendar	OneCalendar
Freemium Lite is free; a Pro licence costs 9.95 EUR.	Free Free to download from the app stores.
Windows, macOS, Linux	Windows, macOS, Android, iOS
Calendar and tasks always visible on the desktop Skinnable, with a skin tutorial and API reference	Supports Google, Outlook, Exchange, iCloud, CalDAV and many other providers Available on Android, iPhone, iPad, Mac and Windows
Some features need the paid Pro edition Closed source	Closed source No Linux version
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	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.