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Spark Mail vs Shortwave: catalog facts
Spark Mail	Shortwave
Freemium Free for individuals; paid plans add AI features and team tools.	Freemium Free to start with no credit card required, with paid options for more features.
Windows, macOS, Android, iOS	Windows, macOS, Android, iOS
Automatic inbox categorization cuts down on manual sorting AI-drafted replies can speed up routine email responses	AI filters written in plain English Drafts replies that match your writing style
AI and team features are gated behind a paid plan Some categorization requires manual correction over time	Built for Gmail accounts Relies on a hosted AI service that processes your mail
Downloadable app	Downloadable app, Hosted service
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.