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Polymail vs Spark Mail: catalog facts
Polymail	Spark Mail
Paid Paid plans with a free trial.	Freemium Free for individuals; paid plans add AI features and team tools.
macOS, iOS	Windows, macOS, Android, iOS
Read tracking and follow-up reminders inside email Several inboxes in one place	Automatic inbox categorization cuts down on manual sorting AI-drafted replies can speed up routine email responses
Requires a paid subscription after the trial Read tracking may not suit privacy-minded recipients	AI and team features are gated behind a paid plan Some categorization requires manual correction over time
Downloadable app, Hosted service	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 October 2, 2026	Official website Full listing and sources Checked September 22, 2026

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