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Mailplane vs Kiwi for Gmail: catalog facts
Mailplane	Kiwi for Gmail
Paid Paid license; the current version 4 download is for existing license holders.	Paid Paid after a free trial, and can be cancelled at any time.
macOS	Windows, macOS
Handles many Gmail accounts in one window Menu bar notifier with quick archive and reply	Gmail and Google Workspace in dedicated desktop windows Quick access to Docs, Sheets, Slides and Drive
Mac only and limited to Google accounts New version 5 not yet released; version 4 is for existing license holders	Only works with Gmail and Google Workspace Paid after the trial
Downloadable app	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 October 2, 2026	Official website Full listing and sources Checked September 23, 2026

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