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Twobird vs Meron: catalog facts
Twobird	Meron
Free No pricing is listed on the homepage.	Free Free and open source under the AGPL-3.0 licence.
macOS	Windows, macOS, Linux, Android, iOS
Notes, reminders and to-dos inside the inbox Collaborative notes within conversations	Kanban board view for organising mail Chat-style threads in a unified inbox
Site gives few details on supported platforms and email providers	Conversation-style layout differs from traditional mail clients Newer project with a smaller user base
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: AGPL-3.0-or-later
Not stated if an account is needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 1, 2026

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