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Mimestream vs Spark Mail: catalog facts
Mimestream	Spark Mail
Paid Paid app with a free trial available to download.	Freemium Free for individuals; paid plans add AI features and team tools.
macOS	Windows, macOS, Android, iOS
Native Mac interface Full support for Gmail labels, categories and filters	Automatic inbox categorization cuts down on manual sorting AI-drafted replies can speed up routine email responses
Works only with Gmail accounts Mac only, requires macOS 12 or newer	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
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 September 23, 2026	Official website Full listing and sources Checked September 22, 2026

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