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Inbox Zero vs MailMaestro: catalog facts
Inbox Zero	MailMaestro
Freemium Free to start, with paid and sales-led plans for more use.	Freemium Free to start with paid plans for more use and for teams.
Web	Web, Browser extension
Automatic labelling and pre-drafted replies Bulk unsubscribe and cold email blocking	Works inside Outlook and Gmail rather than a separate app Drafts replies and summarizes long threads
Supports Google and Microsoft accounts only Mobile apps are not yet available	Gmail support depends on the Chrome extension Email content is processed by a cloud AI service
Web application, Hosted service	Hosted service, Browser extension
Open source	Closed source
License not stated	License not stated
Account needed	Not stated if an account is needed
Needs internet	Needs internet
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 1, 2026

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