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Alternatives

Best Slack alternatives for developer teams

Eight real options for engineering teams leaving Slack, with honest trade-offs for each, including where Slack still wins.

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Shortlist

How we picked

Every tool here is in active use by engineering teams today. We looked at what developers actually ask for when they leave Slack: fast navigation, threads that don’t get lost, integrations with their code tools, docs, and whether they can self-host. We list Hasarak first because it’s ours, and we’ve tried to be straight about where it falls short.

Where Slack still wins

Slack’s app directory is enormous, huddles are convenient, and Slack Connect makes channels with customers and vendors easy. If those matter most to your team, staying on Slack is reasonable.

1. Hasarak

Best for engineering teams that want chat, docs and their AI tools in one workspace.

Where it's strong

  • A built-in MCP server that any MCP client can sign in to with OAuth
  • Pages: docs edited together, with tables, images and Mermaid diagrams, next to the channel
  • One inbox for mentions, thread replies and DMs
  • @ai answers in threads with your own ChatGPT or Cursor account
  • Vim keys in the Minimal style; your own tools connect through one HTTP endpoint

Where it falls short

  • No voice or video calls
  • Web app only for now; desktop and mobile apps aren't released yet
  • Hosted only; no self-hosting
  • A small connector catalog compared with Slack's app directory
  • No importer for Slack history yet

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2. Mattermost

Best for organizations that must self-host for security or compliance.

Where it's strong

  • Open source, runs on-premises or air-gapped
  • Familiar, Slack-like channels and threads
  • Enterprise compliance, audit and high-availability options

Where it falls short

  • You run, upgrade and back up the server yourself
  • Paid plans are sold through sales, and the free Entry edition has usage limits
  • No official terminal client

Hasarak vs Mattermost, side by side

3. Zulip

Best for async-heavy teams and open-source communities.

Where it's strong

  • Topics inside channels keep parallel discussions readable
  • Open source, in Zulip's cloud or self-hosted
  • Thorough keyboard shortcuts and a terminal client (zulip-terminal)
  • Sponsored plans for open-source projects

Where it falls short

  • The topic model takes some getting used to
  • No docs or wiki next to chat

Hasarak vs Zulip, side by side

4. Rocket.Chat

Best for teams that need self-managed chat plus customer-facing omnichannel.

Where it's strong

  • Self-managed, including air-gapped deployments
  • Omnichannel: live chat and messaging channels in one queue
  • Voice, video, end-to-end encryption and Matrix federation

Where it falls short

  • Broad feature set means more to configure
  • Hosted commercial plans go through sales

Hasarak vs Rocket.Chat, side by side

5. Element

Best for teams that need end-to-end encryption and federation (Matrix).

Where it's strong

  • End-to-end encrypted by default
  • Federated: talk across organizations without a central provider
  • Open source; business plans run on your own infrastructure

Where it falls short

  • Running a homeserver and bridges is real work
  • Fewer work integrations than mainstream tools

Hasarak vs Element, side by side

6. Google Chat

Best for companies already on Google Workspace.

Where it's strong

  • Included with Workspace, inside Gmail
  • Works closely with Drive, Calendar and Meet

Where it falls short

  • Feels like a sidebar to Gmail for heavy chat users
  • No terminal client

Hasarak vs Google Chat, side by side

7. Microsoft Teams

Best for companies already on Microsoft 365, especially meeting-heavy ones.

Where it's strong

  • Included with Microsoft 365 Business plans, or as an add-on
  • Strong meetings, calling and Office integration

Where it falls short

  • Heavy for quick written back-and-forth
  • Partial keyboard navigation and no terminal client

Hasarak vs Microsoft Teams, side by side

8. Discord

Best for small teams that live in voice, or also run a public community.

Where it's strong

  • Excellent voice channels and screen sharing
  • Free for most uses

Where it falls short

  • Built for communities, not work: no docs, light work integrations
  • Workspace admin and compliance features are limited

Hasarak vs Discord, side by side

Questions

What is the best Slack alternative for developers?

For teams that want docs next to chat and an MCP server for their AI tools, Hasarak. For self-hosting, Mattermost or Zulip. For encryption and federation, Element. If you're on Google Workspace or Microsoft 365, Google Chat or Teams may already be paid for.

Is there a free Slack alternative?

Several. Hasarak, Zulip and Twist have free plans, Discord is free for most uses, and Mattermost, Rocket.Chat and Element publish free self-hosted editions. Each free tier has its own limits, so check them against your team's size.

What is the best self-hosted Slack alternative?

Mattermost, Zulip, Rocket.Chat and Element (Matrix) are the main self-hosted options. Hasarak is hosted only.

Is there a Slack alternative with a terminal client?

Zulip has an official one, zulip-terminal. Hasarak's terminal client is in development and not released yet. For Slack itself there are only community clients.

Is there a Slack alternative with an MCP server?

Yes. Every Hasarak workspace is an MCP server that any MCP client can add by URL and sign in to with OAuth. Slack also has an MCP server, but it only accepts clients built on a registered Slack app.

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