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Spark Mail vs Slashy: catalog facts
Spark Mail	Slashy
Freemium Free for individuals; paid plans add AI features and team tools.	Freemium Pricing is not listed on the homepage; a sales demo can be booked.
Windows, macOS, Android, iOS	macOS, iOS
Automatic inbox categorization cuts down on manual sorting AI-drafted replies can speed up routine email responses	Drafts replies in the user's own voice Handles meeting scheduling and follow-ups
AI and team features are gated behind a paid plan Some categorization requires manual correction over time	Built around Gmail rather than any mail provider Pricing is not clearly stated on the site
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 October 2, 2026

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