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Kiwi for Gmail vs Thunderbird: catalog facts
Kiwi for Gmail	Thunderbird
Paid Paid after a free trial, and can be cancelled at any time.	Free Free forever, funded by donations.
Windows, macOS	Windows, macOS, Linux, Android
Gmail and Google Workspace in dedicated desktop windows Quick access to Docs, Sheets, Slides and Drive	Unified inbox across every account, or each account kept separate, your choice Mail, calendar, contacts and tasks in one application rather than four
Only works with Gmail and Google Workspace Paid after the trial	The interface carries a lot of history and can feel dense next to a webmail tab Major ESR releases have historically been disruptive for add-ons and settings
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: MPL-2.0
Account needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 20, 2026

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