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Shortwave vs Spike: catalog facts
Shortwave	Spike
Freemium Free to start with no credit card required, with paid options for more features.	Freemium Free for individuals; paid plans add AI and team features.
Windows, macOS, Android, iOS	Windows, macOS, Android, iOS
AI filters written in plain English Drafts replies that match your writing style	Chat-style layout can make long threads easier to follow AI features aim to help with organizing and responding faster
Built for Gmail accounts Relies on a hosted AI service that processes your mail	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 September 23, 2026	Official website Full listing and sources Checked September 22, 2026

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