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Polymail vs Shortwave: catalog facts
Polymail	Shortwave
Paid Paid plans with a free trial.	Freemium Free to start with no credit card required, with paid options for more features.
macOS, iOS	Windows, macOS, Android, iOS
Read tracking and follow-up reminders inside email Several inboxes in one place	AI filters written in plain English Drafts replies that match your writing style
Requires a paid subscription after the trial Read tracking may not suit privacy-minded recipients	Built for Gmail accounts Relies on a hosted AI service that processes your mail
Downloadable app, Hosted service	Downloadable app, Hosted service
Closed source	Closed source
License not stated	License not stated
Account needed	Account 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 23, 2026

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