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Mattermost is an open source, on-prem Slack-alternative.

It offers modern communication from behind your firewall, including messaging and file sharing across PCs and phones with archiving and instant search.

All team communication in one place, searchable and accessible anywhere

Please see the features pages of the Mattermost website for images and further description of the functionality listed below:

Sharing Messaging and Files

  • Send messages, comments, files and images across public, private and 1-1 channels
  • Personalize notifications for unreads and mentions by channel and keyword
  • Use #hashtags to tag and find messages, discussions and files

Archiving and Search

  • Import Slack user accounts and channel archives
  • Search public and private channels for historical messages and comments
  • View recent mentions of your name, username, nickname, and custom search terms

Anywhere Access

  • Use Mattermost from web-enabled PCs and phones
  • Attach sound, video and image files from mobile devices
  • Define team-specific branding and color themes across your devices

Self-Host Ready

  • Host and manage dozens of teams from a single Mattermost server
  • Easily manage your Mattermost server using a web-based System Console
  • Script setup and maintenance using Mattermost command line tools

Learn More

Follow us on Twitter at @MattermostHQ, or talk to the core team on our daily builds server via this invite link.

Installing Mattermost

Latest stable release of Mattermost is available from, including binary distribution, and from install guides below.

If you use Docker, you can install Mattermost in a single-container preview in one line.

Quick Start Install for Product Evaluation

  • Local Machine Install with Docker - Explore product functionality using a single-container Docker install on a local machine, including Mac OSX, Ubuntu, or Arch Linux). Optionally set up email and upgrade your instance using DockerHub.

  • AWS EBS Install with Docker - Explore product functionality using a single-container Docker install for Amazon Web Services Elastic Beanstalk. Optionally set up email and upgrade your instance using DockerHub.

Development Install

  • Developer Machine Setup - Setup your local machine development environment using Docker on Mac OSX or Ubuntu. Pull the latest stable release or pull the latest code from our development build.

Build Status

Production Deployment

Prior to production installation, please review Mattermost system requirements.

  • Production Install on Ubuntu 14.04 - Install Mattermost for production environments.

  • GitLab Mattermost Production Installation - Install Mattermost for production environments bundled with GitLab, a leading open source Git repository, using an omnibus package for Ubuntu 12.04, Ubuntu 14.04, Debian 7, Debian 8, and CentOS 6 (and RedHat/Oracle/Scientific Linux 6), CentOS 7 (and RedHat/Oracle/Scientific Linux 7).

For technical questions and answers, please visit the Troubleshooting Forum.

Get Involved with Mattermost

Joining the Mattermost community is a great way to build relationships with other talented and like-minded professionals, increase awareness of the interesting work you are doing, and sharpen your skills. Here are some of the ways that you can make a difference in the Mattermost ecosystem:




  • Blog about your Mattermost experiences and use cases, either on your personal blog, the Mattermost forum, or contribute a guest post to the Mattermost blog. If you write about Mattermost. please contact our community team at for help promoting your content.
  • Tweet to share with your community and friends why you use Mattermost. Follow @MattermostHQ on Twitter and conversations on #mattermost.


  • As with most open source projects, Mattermost documentation is maintained in a public repository. You can propose changes by submitting pull requests (no programming skills required). We highly welcome you to add improvements, write guides and tutorials, and expand on sections.
  • Prior to contributing, please review Mattermost Documentation Guidelines, which include standards on writing Mattermost documentation for a global audience, who might not use English as their first language.


Check out some projects for connecting to Mattermost:

Have other ideas or suggestions?

If there’s some other way you’d like to contribute, please contact us at We’d love to meet you!


Open source Slack-alternative in Golang and React - Mattermost







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