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BlueMail vs Betterbird: catalog facts
BlueMail	Betterbird
Freemium The client is free to download. Some features are reserved for paid plans.	Free Free and open source, funded by donations.
Windows, macOS, Linux, iOS	Windows, macOS, Linux
One inbox covers many accounts across Windows, macOS, Linux, Android and iOS with a consistent interface and shared…	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
It is closed source, some features need a paid plan, and its handling of account credentials has drawn…	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
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 20, 2026

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