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eM Client vs Rainlendar: catalog facts
eM Client	Rainlendar
Freemium Free licence for personal, non-commercial use with up to two accounts; Personal from…	Freemium Lite is free; a Pro licence costs 9.95 EUR.
Windows, macOS, Android, iOS	Windows, macOS, Linux
Handles Gmail, Microsoft 365, Outlook, Exchange and plain IMAP without plugins Email, calendar, tasks, contacts, notes and chat in one polished window	Calendar and tasks always visible on the desktop Skinnable, with a skin tutorial and API reference
No Linux version The free licence is capped at two accounts and forbids any commercial use	Some features need the paid Pro edition Closed source
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License not stated
Account needed	No account needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 20, 2026	Official website Full listing and sources Checked October 2, 2026

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