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Inbox Zero vs Mailstrom: catalog facts
Inbox Zero	Mailstrom
Freemium Free to start, with paid and sales-led plans for more use.	Paid Paid service with a free trial that needs no credit card.
Web	Web
Automatic labelling and pre-drafted replies Bulk unsubscribe and cold email blocking	Bulk delete and unsubscribe across thousands of messages Works with Gmail and other providers
Supports Google and Microsoft accounts only Mobile apps are not yet available	Requires granting a third-party service access to your mailbox Paid after the trial
Web application, Hosted service	Hosted service
Open source	Closed source
License not stated	License not stated
Account needed	Account needed
Needs internet	Needs internet
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 2, 2026

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