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Spike vs Spark Mail: catalog facts
Spike	Spark Mail
Freemium Free for individuals; paid plans add AI and team features.	Freemium Free for individuals; paid plans add AI features and team tools.
Windows, macOS, Android, iOS	Windows, macOS, Android, iOS
Chat-style layout can make long threads easier to follow AI features aim to help with organizing and responding faster	Automatic inbox categorization cuts down on manual sorting AI-drafted replies can speed up routine email responses
Chat-style format is a matter of preference and not for everyone Advanced AI and team features require a paid plan	AI and team features are gated behind a paid plan Some categorization requires manual correction over time
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License not stated
Not stated if an account is 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 September 22, 2026	Official website Full listing and sources Checked September 22, 2026

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