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Spike vs Meron: catalog facts
Spike	Meron
Freemium Free for individuals; paid plans add AI and team features.	Free Free and open source under the AGPL-3.0 licence.
Windows, macOS, Android, iOS	Windows, macOS, Linux, Android, iOS
Chat-style layout can make long threads easier to follow AI features aim to help with organizing and responding faster	Kanban board view for organising mail Chat-style threads in a unified inbox
Chat-style format is a matter of preference and not for everyone Advanced AI and team features require a paid plan	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 September 22, 2026	Official website Full listing and sources Checked October 1, 2026

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