What is UnInbox used for?

UnInbox is an email platform for teams that adds shared conversations, notes and a new-sender screener on top of existing email, positioned as an alternative to Hey, Front and Missive. It is a good fit for running a shared support or sales inbox and collaborating on email threads inside a team.

Is UnInbox open source?

Yes. UnInbox is open source under a custom licence. Its source code is on GitHub at un/inbox and is written mainly in TypeScript.

Yes. UnInbox is open source, so the software itself is free to use under the terms of its own licence. A managed cloud version is also available.

Can I self-host UnInbox?

Yes. UnInbox can be self-hosted on your own server or infrastructure.

What is UnInbox an alternative to?

UnInbox is an open-source alternative to HEY, Front, Missive and Spike. Other open-source alternatives to HEY include Inbox Zero, Tuta and Forward Email.

Is UnInbox actively maintained?

The most recent commit to UnInbox was on 11 February 2026. The project has 1.8k stars on GitHub.

UnInbox: open-source alternative to HEY, Front, Missive

About UnInbox

UnInbox is an open-source communication platform that reimagines email for teams and professionals. Its README argues that email has changed little since the late 1970s while volume and noise have grown, so it builds a modern layer on top of email rather than trying to replace it. The project lists Hey, Front and Missive as products it is an alternative to.

Features described as native include team collaboration, conversation notes and a new-sender screener. It is built to work with your current email infrastructure or to replace it entirely, and the maintainers say email is only the start of a broader communication infrastructure. A hosted app is live at app.uninbox.com, and the team asks users to join its Discord for updates and feedback.

The stack is TypeScript with Next.js and React for the web app, Hono for the public API, Tailwind CSS and tRPC for type-safe APIs. The repository metadata lists the license as Other, so check the license file for the exact terms. It is positioned as open communication infrastructure that teams can build on.

Key features

Shared team conversations over email
Conversation notes for collaboration
New sender screener
Works with existing email infrastructure
Public API built with Hono
Type-safe tRPC architecture

Good fit for

→Running a shared support or sales inbox
→Collaborating on email threads inside a team

Built with: TypeScript; Next.js; React
Tags: email; team-inbox; collaboration; shared-inbox; nextjs; typescript; communication; hey-alternative

UnInbox: questions and answers

What is UnInbox used for?: UnInbox is an email platform for teams that adds shared conversations, notes and a new-sender screener on top of existing email, positioned as an alternative to Hey, Front and Missive. It is a good fit for running a shared support or sales inbox and collaborating on email threads inside a team.
Is UnInbox open source?: Yes. UnInbox is open source under a custom licence. Its source code is on GitHub at un/inbox and is written mainly in TypeScript.
Is UnInbox free?: Yes. UnInbox is open source, so the software itself is free to use under the terms of its own licence. A managed cloud version is also available.
Can I self-host UnInbox?: Yes. UnInbox can be self-hosted on your own server or infrastructure.
What is UnInbox an alternative to?: UnInbox is an open-source alternative to HEY, Front, Missive and Spike. Other open-source alternatives to HEY include Inbox Zero, Tuta and Forward Email.
Is UnInbox actively maintained?: The most recent commit to UnInbox was on 11 February 2026. The project has 1.8k stars on GitHub.