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Microsoft Outlook vs Rainlendar: catalog facts
Microsoft Outlook	Rainlendar
Freemium Free app and account available; Microsoft 365 plans add paid features and Office apps.	Freemium Lite is free; a Pro licence costs 9.95 EUR.
Windows, macOS, Android, iOS, Web	Windows, macOS, Linux
Email, calendar and contacts for multiple accounts in one app Available on desktop, mobile and web	Calendar and tasks always visible on the desktop Skinnable, with a skin tutorial and API reference
Closed source and tied to Microsoft services Some features, including Copilot, require a paid plan	Some features need the paid Pro edition Closed source
Downloadable app, Web application	Downloadable app
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 2, 2026

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