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Meron vs Thunderbird: catalog facts
Meron	Thunderbird
Free Free and open source under the AGPL-3.0 licence.	Free Free forever, funded by donations.
Windows, macOS, Linux, Android, iOS	Windows, macOS, Linux, Android
Kanban board view for organising mail Chat-style threads in a unified inbox	Unified inbox across every account, or each account kept separate, your choice Mail, calendar, contacts and tasks in one application rather than four
Conversation-style layout differs from traditional mail clients Newer project with a smaller user base	The interface carries a lot of history and can feel dense next to a webmail tab Major ESR releases have historically been disruptive for add-ons and settings
Downloadable app	Downloadable app
Open source	Open source
License: AGPL-3.0-or-later	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 October 1, 2026	Official website Full listing and sources Checked September 20, 2026

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