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Betterbird vs Meron: catalog facts
Betterbird	Meron
Free Free and open source, funded by donations.	Free Free and open source under the AGPL-3.0 licence.
Windows, macOS, Linux	Windows, macOS, Linux, Android, iOS
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	Kanban board view for organising mail Chat-style threads in a unified inbox
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	Conversation-style layout differs from traditional mail clients Newer project with a smaller user base
Downloadable app	Downloadable app
Open source	Open source
License: MPL-2.0	License: AGPL-3.0-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 October 1, 2026

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