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eM Client vs Betterbird: catalog facts
eM Client	Betterbird
Freemium Free licence for personal, non-commercial use with up to two accounts; Personal from…	Free Free and open source, funded by donations.
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	Fixes and features Thunderbird has not shipped, listed openly in a comparison table Installs next to Thunderbird and runs on the same profile, so switching back is trivial
No Linux version The free licence is capped at two accounts and forbids any commercial use	A small volunteer project riding on someone else’s release train The Mac build ships in English only and needs a language pack for anything else
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: MPL-2.0
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 20, 2026

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