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Microsoft Outlook vs Shortwave: catalog facts
Microsoft Outlook	Shortwave
Freemium Free app and account available; Microsoft 365 plans add paid features and Office apps.	Freemium Free to start with no credit card required, with paid options for more features.
Windows, macOS, Android, iOS, Web	Windows, macOS, Android, iOS
Email, calendar and contacts for multiple accounts in one app Available on desktop, mobile and web	AI filters written in plain English Drafts replies that match your writing style
Closed source and tied to Microsoft services Some features, including Copilot, require a paid plan	Built for Gmail accounts Relies on a hosted AI service that processes your mail
Downloadable app, Web application	Downloadable app, Hosted service
Closed source	Closed source
License not stated	License not stated
Not stated if an account is 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.