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Kiwi for Gmail vs Checker Plus for Gmail: catalog facts
Kiwi for Gmail	Checker Plus for Gmail
Paid Paid after a free trial, and can be cancelled at any time.	Free Free to use, with optional donations unlocking extra features.
Windows, macOS	Browser extension
Gmail and Google Workspace in dedicated desktop windows Quick access to Docs, Sheets, Slides and Drive	Handles several Gmail accounts from one popup without opening tabs Desktop notifications with actions, including archive and delete
Only works with Gmail and Google Workspace Paid after the trial	Requires broad access to your Gmail account Closed source, with optional paid donations unlocking extras
Downloadable app	Browser extension
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 22, 2026

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