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Meron vs Spark Mail: catalog facts
Meron	Spark Mail
Free Free and open source under the AGPL-3.0 licence.	Freemium Free for individuals; paid plans add AI features and team tools.
Windows, macOS, Linux, Android, iOS	Windows, macOS, Android, iOS
Kanban board view for organising mail Chat-style threads in a unified inbox	Automatic inbox categorization cuts down on manual sorting AI-drafted replies can speed up routine email responses
Conversation-style layout differs from traditional mail clients Newer project with a smaller user base	AI and team features are gated behind a paid plan Some categorization requires manual correction over time
Downloadable app	Downloadable app
Open source	Closed source
License: AGPL-3.0-or-later	License not stated
No account needed	Not stated if an account is 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 September 22, 2026

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