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Shortwave vs Kiwi for Gmail: catalog facts
Shortwave	Kiwi for Gmail
Freemium Free to start with no credit card required, with paid options for more features.	Paid Paid after a free trial, and can be cancelled at any time.
Windows, macOS, Android, iOS	Windows, macOS
AI filters written in plain English Drafts replies that match your writing style	Gmail and Google Workspace in dedicated desktop windows Quick access to Docs, Sheets, Slides and Drive
Built for Gmail accounts Relies on a hosted AI service that processes your mail	Only works with Gmail and Google Workspace Paid after the trial
Downloadable app, Hosted service	Downloadable app
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 September 23, 2026

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