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Spark Mail vs Polymail: catalog facts
Spark Mail	Polymail
Freemium Free for individuals; paid plans add AI features and team tools.	Paid Paid plans with a free trial.
Windows, macOS, Android, iOS	macOS, iOS
Automatic inbox categorization cuts down on manual sorting AI-drafted replies can speed up routine email responses	Read tracking and follow-up reminders inside email Several inboxes in one place
AI and team features are gated behind a paid plan Some categorization requires manual correction over time	Requires a paid subscription after the trial Read tracking may not suit privacy-minded recipients
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 October 2, 2026

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