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Meron vs Aerion: catalog facts
Meron	Aerion
Free Free and open source under the AGPL-3.0 licence.	Free Free and open source under the Apache 2.0 licence.
Windows, macOS, Linux, Android, iOS	Windows, macOS, Linux
Kanban board view for organising mail Chat-style threads in a unified inbox	Built with Wails instead of Electron for lower resource use Direct IMAP and SMTP connection with mail stored locally
Conversation-style layout differs from traditional mail clients Newer project with a smaller user base	Young project with a smaller feature set than established clients Tracking protection is described as basic
Downloadable app	Downloadable app
Open source	Open source
License: AGPL-3.0-or-later	License: Apache-2.0
No account needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 1, 2026

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