Inbox Zero vs Superhuman Mail

Inbox Zero

• Gmail and Outlook users who want mail sorted and replies drafted for them
• Teams that prefer open source software they can inspect or self-host
• Clearing newsletters and cold outreach out of a crowded inbox

Superhuman Mail

• People on Gmail or Outlook who work through a high volume of email
• Teams that want to share and comment on threads instead of forwarding them
• Sales teams on HubSpot, Salesforce or Pipedrive (Business plan and up)

Inbox Zero

• There is no free plan for the hosted service: every plan starts with a 7-day trial that needs a credit card.
• It supports Gmail, Google Workspace and Microsoft Outlook accounts only.
• The AI meeting notetaker, Slack and app integrations, email digests and auto-filed attachments start at Plus.
• The free Inbox Zero Tabs browser extension works with Gmail only, and the mobile apps leave some settings to the web app.

Superhuman Mail

• There is no free plan, and the pricing page does not mention a free trial.
• Built for Gmail and Outlook accounts; the vendor lists no other email providers.
• Auto Drafts, Ask AI and the HubSpot, Salesforce and Pipedrive integrations are not included in Starter.
• Starter and Business stop at 25 seats; single sign-on and SCIM are Enterprise only.

Inbox Zero

AI labels and plain-English rules

Incoming mail is sorted into categories such as To Reply, Newsletter, Marketing and Cold Email. You can add categories of your own and describe in plain English how the assistant should handle mail.

Pre-drafted replies

Emails that need a response get a draft written in your tone, based on your email history and calendar, waiting in the inbox for you to review and send.

Bulk unsubscribe and archive

Shows which senders you never read so you can unsubscribe from and archive them in one click. A cold email blocker and email analytics are part of every plan.

Optional email client

A keyboard-first client for Gmail and Outlook on web, desktop and iPhone, with a split inbox, a command palette, several accounts in one inbox and team comments that are never sent as email.

Chat from Slack and Telegram

The assistant can be reached from Slack or Telegram to read mail, draft replies and manage the inbox. The pricing page lists the Slack integration from the Plus plan.

Open source and self-hosting

The code is public on GitHub, with the web and desktop email client under the AGPL license. The docs cover self-hosting with Docker, on Vercel, AWS or Kubernetes.

Superhuman Mail

Split Inbox

Divides the inbox into separate tabs, for example mail from teammates, VIPs or specific tools, so each stream can be worked through on its own.

Keyboard shortcuts and Snippets

Most actions have a keyboard shortcut, and Snippets insert saved phrases, paragraphs or whole emails as you type.

Superhuman AI

Write with AI, Instant Reply, Auto Summarize and Auto Labels are on every plan. Auto Drafts, Ask AI and the Mail MCP server need Business or Enterprise.

Reminders, snooze and send later

Set a follow-up reminder that fires if nobody replies by a chosen time, snooze threads until they are needed and schedule when a message is sent.

Shared conversations and comments

Share a live view of a thread with teammates, comment on it, work on shared drafts and see when a colleague is already replying.

Calendar and scheduling

See the day's or week's calendar next to an email, create events, share availability and send booking links, with Zoom, Google Meet and Microsoft Teams links.

Inbox Zero

• Starter$18

  per user / month, billed annually; $20 billed monthly

  Sorts and labels every email, drafts replies in your voice, blocks cold emails, bulk unsubscribe and archive, email analytics and pre-meeting briefings.

• Plus$28

  per user / month, billed annually; $35 billed monthly

  Adds 2 email accounts per user, the AI meeting notetaker, Slack and app integrations, email digests, auto-filed attachments and an unlimited knowledge base.

• Professional$42

  per user / month, billed annually; $50 billed monthly

  Everything in Plus, plus team-wide analytics, priority support and a dedicated onboarding manager.

• EnterpriseCustom

  SSO, SCIM, on-premise deployment and a dedicated account manager, arranged with the sales team.

Superhuman Mail

• Starter$25

  per member / month, billed annually ($30 billed monthly)

  Split Inbox, Snippets, core AI writing and summaries, calendar and booking links, and team sharing. Up to 25 seats.

• Business$33

  per member / month, billed annually ($40 billed monthly)

  Everything in Starter, plus Auto Drafts, Ask AI, the Mail MCP server, CRM integrations and Recent Opens. Up to 25 seats.

• EnterpriseCustom

  Everything in Business, plus single sign-on, SCIM provisioning, audit logs, team analytics and unlimited seats.

Inbox Zero

• Annual discount

  Save up to 20% with annual billing

  Annual billing lowers Starter from $20 to $18, Plus from $35 to $28 and Professional from $50 to $42 per user a month. The pricing FAQ puts the saving at up to 20%.

• Education

  Student discount on request

  The pricing FAQ says students can email the company to have a discounted plan set up. The size of the discount is not published.

• Nonprofit

  Nonprofit and open-source project discounts

  The same FAQ answer covers nonprofits and open-source projects, which can email for a discounted plan. No rate is published.

Superhuman Mail

• Annual discount

  17% off with annual billing

  The pricing page shows 17% off for annual billing: Starter is $25 per member a month billed annually against $30 billed monthly, and Business is $33 against $40.