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Betterbird vs The Bat!: catalog facts
Betterbird	The Bat!
Free Free and open source, funded by donations.	Paid Commercial software from Ritlabs; prices are not listed on the product page.
Windows, macOS, Linux	Windows
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	Optional encryption of the local message base Blocks tracking pixels and malicious code in mail
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	Windows only Commercial license required
Downloadable app	Downloadable app
Open source	Closed source
License: MPL-2.0	License not stated
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 23, 2026

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