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Betterbird vs eM Client: catalog facts
Betterbird	eM Client
Free Free and open source, funded by donations.	Freemium Free licence for personal, non-commercial use with up to two accounts; Personal from…
Windows, macOS, Linux	Windows, macOS, Android, iOS
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	Handles Gmail, Microsoft 365, Outlook, Exchange and plain IMAP without plugins Email, calendar, tasks, contacts, notes and chat in one polished window
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	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: MPL-2.0	License not stated
No account needed	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.