Inbox Zero

Inbox Zero review and pricing: a free, open-source email app for Gmail and Outlook with optional AI sorting and drafts, with Superhuman as an alternative.

free tierWeb, Mac, Windows, iPhone, Android

Visit Inbox Zero

Overview

Inbox Zero is a free email app for Gmail and Outlook, with paid AI that sorts your mail and drafts replies. The app runs on the web, Mac, Windows, iPhone and Android.

The AI labels every email, leaves a draft reply in your voice on mail that needs one, blocks cold email and bulk-unsubscribes from newsletters you never read. Higher plans add a meeting notetaker and Slack.

Its AI assistant, web and desktop apps are open source, and you can self-host them. We haven't used it for this page; it relies on Inbox Zero's pricing page, homepage, privacy policy and terms.

Best for

Gmail or Outlook users who get more email than they can answer and want a free client with optional AI drafts.

Skip it if

Skip it if you use an email provider other than Gmail or Outlook, or don't want email content sent to outside AI services.

Pricing

Email appFree

$0; email app for Gmail and Outlook on web, desktop and mobile.

One inbox for Gmail and Outlook accounts

Starter$18/user/mo

Billed annually, or $20/user/mo monthly; 7-day free trial.

Sorts and labels email
Drafts replies in your voice
Cold email blocker
Bulk unsubscribe and archive

Plus$28/user/mo

Billed annually, or $35/user/mo monthly; 7-day free trial; 2 email accounts per user.

AI meeting notetaker
Slack and app integrations
Unlimited knowledge base

Professional$42/user/mo

Billed annually, or $50/user/mo monthly; 7-day free trial.

Team-wide analytics
Priority support
Dedicated onboarding manager

EnterpriseCustom

Sales quote.

SSO and SCIM
On-premise deployment

The Inbox Zero email app is free; AI plans are $18, $28 or $42 per user a month billed annually ($20, $35 or $50 monthly), with a 7-day free trial. Checked Oct 20, 2026 on the official pricing page.

Pros

Free email app. The mail app is free on web, desktop and iPhone; the AI is optional.
Drafts in your voice. Replies are pre-written from your email history and calendar.
Open source. The AI assistant, web and desktop apps are open source, and you can self-host them.
Inbox cleanup. Bulk unsubscribe, bulk archive and a cold email blocker are built in.

Cons

Email goes to outside AI. Its privacy policy says subject lines, body text and sender details may be shared with third-party AI services, which it bars from training on them.
Gmail and Outlook only. It connects Google and Microsoft email accounts, so other providers are left out.
Terms can change at once. Its terms say revisions take effect as soon as they're posted.

How it compares

Inbox Zero and Superhuman both sort mail and draft replies. Superhuman Mail starts at $25 per member a month billed yearly; Inbox Zero's app is free, and its AI starts at $18 per user billed annually.

Pick Inbox Zero for a free client or self-hosting. Pick Superhuman if you'd rather pay for one polished app.

Quick start

Sign up free at getinboxzero.com.
Connect your Gmail or Outlook account.
Keep the suggested categories or create your own.
Review the drafted replies before sending.
Start a 7-day trial if you want the AI plans.

Verdict

Inbox Zero is our pick for Gmail and Outlook users who want a free email app with optional AI drafts. Try the AI on the 7-day trial first. Skip it if you use another provider or won't send email to outside AI services.