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Claws Mail vs eM Client: catalog facts
Claws Mail	eM Client
Free Free and open source under the GPL 3.0 or later.	Freemium Free licence for personal, non-commercial use with up to two accounts; Personal from…
Windows, macOS, Linux	Windows, macOS, Android, iOS
Opens and searches enormous mail folders without stalling Plugins for PGP, spam filtering, RSS and calendars ship with it	Handles Gmail, Microsoft 365, Outlook, Exchange and plain IMAP without plugins Email, calendar, tasks, contacts, notes and chat in one polished window
Composes plain text by default; HTML mail sending is deliberately limited The interface is functional and looks like it was designed in 2004	No Linux version The free licence is capped at two accounts and forbids any commercial use
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0-or-later	License not stated
No account needed	Account needed
Works offline	Works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 20, 2026

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