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Mimestream vs Shortwave: catalog facts
Mimestream	Shortwave
Paid Paid app with a free trial available to download.	Freemium Free to start with no credit card required, with paid options for more features.
macOS	Windows, macOS, Android, iOS
Native Mac interface Full support for Gmail labels, categories and filters	AI filters written in plain English Drafts replies that match your writing style
Works only with Gmail accounts Mac only, requires macOS 12 or newer	Built for Gmail accounts Relies on a hosted AI service that processes your mail
Downloadable app	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 September 23, 2026

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