Inbox Zero is an open-source AI assistant for Gmail and Outlook that sorts and labels every incoming email, pre-drafts replies in your own voice, blocks cold emails, and lets you bulk-unsubscribe and archive the mail you never read. It works inside Gmail or Outlook, or in its own fast, keyboard-first email app for the web, Mac, Windows and iPhone. The email app is free; the AI assistant plans start at $18 per month with a 7-day trial. The code is open source and the service is SOC 2 Type 2 certified. Its email client launched on Product Hunt on 18 October 2026.

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