What is Inbox Zero Mail?

Inbox Zero Mail is an open-source email client for Gmail and Outlook that unifies multiple accounts in one fast, keyboard-first inbox on web, Mac, Windows, and iPhone.

Is Inbox Zero free to use?

The email client is free to use, with an optional AI add-on available for $20 per month.

Is Inbox Zero open source?

Yes, Inbox Zero is open-source.

Which email providers does Inbox Zero support?

Inbox Zero Mail supports Gmail and Outlook.

Inbox Zero

Open-source Superhuman alternative

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Listing details

HiCyou directory record

Listed

Listed website: getinboxzero.com
Directory record created: Oct 19, 2026
Last record update: Oct 19, 2026

Listing information

Overview
7 key features
4 use cases

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What is Inbox Zero

Inbox Zero Mail is an open-source email client for Gmail and Outlook, available on web, Mac, Windows, and iPhone. It offers a fast, keyboard-first experience that unifies all your accounts into a single inbox. Its optional AI add-on sorts incoming email and drafts replies in your voice, and includes features like private team comments, Slack alerts, and contextual information from your tools.

Key Features

Open-source email client for Gmail and Outlook

All accounts unified in one inbox on web, Mac, Windows, and iPhone

Fast, keyboard-first interface

AI-powered email sorting and reply drafting in your voice (paid add-on)

Private team comments on emails

Slack alerts and AI context from connected tools

Email automation, bulk unsubscribe, and cold email blocking

Use Cases

Managing multiple email accounts in a single unified inbox
Reducing time spent triaging and replying to email with AI assistance
Collaborating with teammates privately on email threads
Cleaning up inboxes through bulk unsubscribe and cold email blocking

Why do startups need this tool?

Inbox Zero combines a free, open-source email client with an affordable AI add-on, making it easy for startups to streamline email handling across Gmail and Outlook accounts without heavy licensing costs. Team comments and Slack alerts also help founders and small teams collaborate on email more efficiently.