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Pegasus Mail vs Betterbird: catalog facts
Pegasus Mail	Betterbird
Free Free to use; the developer accepts donations.	Free Free and open source, funded by donations.
Windows	Windows, macOS, Linux
Free with no paid tier Decades of continuous development	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
Windows only Traditional interface and slow release pace	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
Closed source	Open source
License not stated	License: MPL-2.0
No account needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 20, 2026

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