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Betterbird vs Balsa: catalog facts
Betterbird	Balsa
Free Free and open source, funded by donations.	Free Free and open source under the GPL.
Windows, macOS, Linux	Linux
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	Lightweight native GTK interface Fits in with the GNOME desktop
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	Linux only Smaller feature set than full PIM suites
Downloadable app	Downloadable app
Open source	Open source
License: MPL-2.0	License: GPL-2.0-or-later
No account needed	No account needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 20, 2026	Official website Full listing and sources Checked September 24, 2026

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