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Shortwave vs Polymail: catalog facts
Shortwave	Polymail
Freemium Free to start with no credit card required, with paid options for more features.	Paid Paid plans with a free trial.
Windows, macOS, Android, iOS	macOS, iOS
AI filters written in plain English Drafts replies that match your writing style	Read tracking and follow-up reminders inside email Several inboxes in one place
Built for Gmail accounts Relies on a hosted AI service that processes your mail	Requires a paid subscription after the trial Read tracking may not suit privacy-minded recipients
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 September 23, 2026	Official website Full listing and sources Checked October 2, 2026

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