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Rainlendar vs Microsoft Outlook: catalog facts
Rainlendar	Microsoft Outlook
Freemium Lite is free; a Pro licence costs 9.95 EUR.	Freemium Free app and account available; Microsoft 365 plans add paid features and Office apps.
Windows, macOS, Linux	Windows, macOS, Android, iOS, Web
Calendar and tasks always visible on the desktop Skinnable, with a skin tutorial and API reference	Email, calendar and contacts for multiple accounts in one app Available on desktop, mobile and web
Some features need the paid Pro edition Closed source	Closed source and tied to Microsoft services Some features, including Copilot, require a paid plan
Downloadable app	Downloadable app, Web application
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	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.