Open Source Superhuman Alternatives
A curated collection of the 2 best open source alternatives to Superhuman.
The best open source alternative to Superhuman is Inbox Zero. If that doesn't suit you, we've compiled a ranked list of other open source Superhuman alternatives to help you find a suitable replacement. Other interesting open source alternative to Superhuman is UnInbox.
Superhuman alternatives are mainly Email & Communication but may also be AI Interaction & Interfaces or Collaboration & Communication. Browse these if you want a narrower list of alternatives or looking for a specific functionality of Superhuman.
An AI email assistant that organizes your inbox, pre-drafts replies and unsubscribes in bulk, for anyone losing hours to email.
Inbox Zero is a self-hostable assistant that works the inbox for you. It organizes incoming mail, pre-drafts replies in your own tone and style, manages your calendar and files attachments, with the stated mission of leaving you more time for the work that email keeps interrupting.
Rules are written in plain English rather than filter syntax, so you describe how the assistant should handle a kind of message and it applies that description. You can also talk to it from Slack or Telegram, which means triage does not require opening another tab.
Most of the rest of the product is aimed at mail you never asked for.
- Reply Zero: tracks the messages waiting on you and the ones you are waiting on.
- Bulk unsubscriber: one click unsubscribes from and archives the newsletters you never open.
- Cold email blocker: filters unsolicited outreach out of the inbox automatically.
- Meeting briefs: pulls context from mail and calendar into a briefing before each meeting.
- Smart filing: saves attachments to Google Drive or OneDrive without being asked.
The stack is Next.js, Prisma, Tailwind and Upstash in a Turborepo. Self-hosting goes through a CLI with a one-time setup wizard and a start command, needing Docker and Node 24 or later, and a hosted version exists for people who would rather not run it themselves. Analytics over your own email habits are built in.
Open source email built for teams, with shared spaces, per-conversation workflow statuses and unlimited addresses, for anyone drowning in shared inboxes.
The first email was sent almost 45 years ago, before the mobile telephone existed, and the experience has barely moved since while the volume has exploded. UnInbox keeps the universal protocol and retires the inbox around it, so a team stops forwarding messages to each other to work out who is answering.
Conversations live in shared spaces that a whole team can read, comment on and reply to from one address. It runs alongside existing email infrastructure or replaces it entirely, and the web app is a TypeScript project built on Next.js with a Hono public API and MySQL behind Drizzle.
Collaboration is native here rather than bolted on afterwards.
- Shared spaces: a team comments on a conversation and replies from a shared address instead of forwarding it.
- Workflow statuses: each conversation carries a status, so everyone can see whether it has been dealt with.
- Unlimited addresses: support, sales, billing and any other address a team invents point at the same place.
- Sender screening: unknown senders are screened before they land in front of the team.
- Conversation notes: context is written on the conversation itself rather than in a side channel.
Running it locally needs Node.js 20 or later, pnpm 9 or later and Docker. Clone it, copy the example environment file, bring up the containers, push the schema and start the dev server. Self-hosting in production is possible but takes extra manual configuration for email, which the Discord community documents. The license is AGPLv3, and cloning into a private repository requires a commercial license.
