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Boomerang for Gmail vs Right Inbox: catalog facts
Boomerang for Gmail	Right Inbox
Free Can be added to Gmail for free; the homepage does not list paid tiers.	Paid Paid plans required for full functionality.
Browser extension	Browser extension
Send-later scheduling inside Gmail Email reminders	Combines send-later, reminders, and tracking in a single Gmail extension Used by a large base of professionals as a lightweight Gmail add-on
Only works with Gmail and Google Workspace Requires granting access to your Gmail account	Works only within Gmail, not other webmail or desktop clients Full feature set requires a paid plan
Browser extension	Browser extension
Closed source	Closed source
License not stated	License not stated
Account needed	Not stated if an account is needed
Needs internet	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.