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Checker Plus for Gmail vs Kiwi for Gmail: catalog facts
Checker Plus for Gmail	Kiwi for Gmail
Free Free to use, with optional donations unlocking extra features.	Paid Paid after a free trial, and can be cancelled at any time.
Browser extension	Windows, macOS
Handles several Gmail accounts from one popup without opening tabs Desktop notifications with actions, including archive and delete	Gmail and Google Workspace in dedicated desktop windows Quick access to Docs, Sheets, Slides and Drive
Requires broad access to your Gmail account Closed source, with optional paid donations unlocking extras	Only works with Gmail and Google Workspace Paid after the trial
Browser extension	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 September 22, 2026	Official website Full listing and sources Checked September 23, 2026

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