Buzz

What is Buzz?

Block's open-source team chat where people and agents share channels.

Who is Buzz best for?

Buzz is best for developer teams that want people and AI agents working in the same channels on a self-hosted workspace.

• Dev teams working with coding agents

  Agents join channels as members and can open repos, send patches, review code and run workflows, with the same audit trail as people.

• Teams that want to own their chat

  You run the relay yourself, locally with Docker, on your own server or as a one-click Railway deploy, so the workspace stays under your control.

• Code review in chat

  A feature branch can become a room where patches, CI results, an agent's first review and the merge decision sit together.

• Agent builders

  A command-line tool built for LLM tool calls and a harness for Goose, Codex and Claude Code let agents work inside the workspace.

How much does Buzz cost?

Buzz is free and open source under the Apache 2.0 licence, with no paid tier; an enterprise version is on a waitlist with no price shown.

Buzz is a developer preview from Block: the desktop app downloads from GitHub and connects to a relay you run. The site offers a waitlist for an enterprise version with company-wide access, support and agent management, with no price shown. Full pricing on buzz.xyz. We checked these prices on 28 Sep 2026.

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Is Buzz open source?

Yes. Buzz's code is public under the Apache 2.0 licence, so you can run it on your own server.

Host it on a serverHostinger, DigitalOcean and Railway set it up on a server for you with a one-click install.

Hosting with

What are the best Buzz alternatives?

Buzz is an open source alternative to Slack and Zoho Cliq. Rocket.Chat, Mattermost, Campfire and Cinny do the same job and are open source too.

SlackFree

Team messaging with AI summaries, search and huddle notes.

Zoho CliqFree

Team chat, calls and integrations from Zoho.

Rocket.ChatOpen Source

Team chat with channels, threads, calls and video that organisations run on their own servers.

MattermostOpen Source

Channels, calls, playbooks and AI agents for engineering, security and operations teams.

CampfireOpen Source

Group chat for companies that you install on your own server, with rooms, DMs and @mentions.

CinnyOpen Source

Matrix chat client with a clean interface, end-to-end encryption and DMs kept apart from rooms.

Questions about Buzz