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Mailbutler vs Right Inbox: catalog facts
Mailbutler	Right Inbox
Paid Subscription service with a 14-day free trial.	Paid Paid plans required for full functionality.
macOS, Browser extension	Browser extension
Works inside Apple Mail and Gmail Mail merge with scheduled sending	Combines send-later, reminders, and tracking in a single Gmail extension Used by a large base of professionals as a lightweight Gmail add-on
Email tracking reveals recipient activity, which some recipients object to Requires a subscription after the trial	Works only within Gmail, not other webmail or desktop clients Full feature set requires a paid plan
Downloadable app, Browser extension	Browser extension
Closed source	Closed source
License not stated	License not stated
Account needed	Not stated if an account is 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.