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Thunderbird vs Betterbird: catalog facts
Thunderbird	Betterbird
Free Free forever, funded by donations.	Free Free and open source, funded by donations.
Windows, macOS, Linux, Android	Windows, macOS, Linux
Unified inbox across every account, or each account kept separate, your choice Mail, calendar, contacts and tasks in one application rather than four	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
The interface carries a lot of history and can feel dense next to a webmail tab Major ESR releases have historically been disruptive for add-ons and settings	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
Open source	Open source
License: MPL-2.0	License: MPL-2.0
No 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.