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Spark Mail vs Kiwi for Gmail: catalog facts
Spark Mail	Kiwi for Gmail
Freemium Free for individuals; paid plans add AI features and team tools.	Paid Paid after a free trial, and can be cancelled at any time.
Windows, macOS, Android, iOS	Windows, macOS
Automatic inbox categorization cuts down on manual sorting AI-drafted replies can speed up routine email responses	Gmail and Google Workspace in dedicated desktop windows Quick access to Docs, Sheets, Slides and Drive
AI and team features are gated behind a paid plan Some categorization requires manual correction over time	Only works with Gmail and Google Workspace Paid after the trial
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	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 September 23, 2026

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