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eM Client vs The Bat!: catalog facts
eM Client	The Bat!
Freemium Free licence for personal, non-commercial use with up to two accounts; Personal from…	Paid Commercial software from Ritlabs; prices are not listed on the product page.
Windows, macOS, Android, iOS	Windows
Handles Gmail, Microsoft 365, Outlook, Exchange and plain IMAP without plugins Email, calendar, tasks, contacts, notes and chat in one polished window	Optional encryption of the local message base Blocks tracking pixels and malicious code in mail
No Linux version The free licence is capped at two accounts and forbids any commercial use	Windows only Commercial license required
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License not stated
Account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 20, 2026	Official website Full listing and sources Checked September 23, 2026

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