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Polymail vs Spike: catalog facts
Polymail	Spike
Paid Paid plans with a free trial.	Freemium Free for individuals; paid plans add AI and team features.
macOS, iOS	Windows, macOS, Android, iOS
Read tracking and follow-up reminders inside email Several inboxes in one place	Chat-style layout can make long threads easier to follow AI features aim to help with organizing and responding faster
Requires a paid subscription after the trial Read tracking may not suit privacy-minded recipients	Chat-style format is a matter of preference and not for everyone Advanced AI and team features require a paid plan
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.