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Betterbird vs Pegasus Mail: catalog facts
Betterbird	Pegasus Mail
Free Free and open source, funded by donations.	Free Free to use; the developer accepts donations.
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	Free with no paid tier Decades of continuous development
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 Traditional interface and slow release pace
Downloadable app	Downloadable app
Open source	Closed source
License: MPL-2.0	License not stated
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 23, 2026

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