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Mattermost logo horizontal.svg
Mattermost UI.png
Developer(s)Mattermost Inc
Initial releaseOctober 2, 2015; 3 years ago (2015-10-02)
Stable release
Repository Edit this at Wikidata
Written inGo[1][2]
Available in11 languages
LicenseMIT License for compiled versions produced by Mattermost, Inc.[3], AGPLv3 for most server-side source code[3] (Apache License 2.0 for Admin Tools and Configuration Files)[3], and Apache License 2.0 for the rest[4]

Mattermost is an open-source, self-hostable online chat service. It is designed as an internal chat for organisations and companies, and mostly markets itself as an alternative to Slack.[5]

The code was originally proprietary, as Mattermost was used as an internal chat tool inside SpinPunch, a game developer studio, but was later open-sourced.[5] The 1.0 was released on October 2, 2015.[6]

The project is maintained and developed by Mattermost Inc.[7] The company generates funds by selling support services and additional features that aren't in the open-source edition.

There are desktop clients for Windows, MacOS, and Linux and mobile apps for iOS and Android.

In the media Mattermost is mostly regarded as an alternative to the more popular Slack.[8][9][10][11] It also got integrated into GitLab as "GitLab Mattermost",[12] although in the mean time GitLab acquired Gitter,[13] another popular chat tool.


  1. ^ Baker, Jason (2017-08-17). "5 open source alternatives to Slack for team chat". Retrieved 2019-04-12.
  2. ^ Henrique, Gustavo (2019-01-27). "10 tools written in Go that every developer needs to know • Gustavo Henrique". Gustavo Henrique. Retrieved 2019-04-12.
  3. ^ a b c "Mattermost's License". 2018-08-01. Retrieved 2018-12-16.
  4. ^ "Mattermost's License". 2018. Retrieved 2018-12-16.
  5. ^ a b "Why we made Mattermost an open source Slack-alternative | Mattermost". Retrieved 2018-10-21.
  6. ^ "Open source Slack-alternative reaches 1.0: Self-host ready, Slack-compatible, MIT licensed - Mattermost Private Cloud Messaging". Mattermost Private Cloud Messaging. 2015-10-02. Retrieved 2018-10-21.
  7. ^ "Crunchbase". Retrieved 2018-10-21.
  8. ^ "Quelloffene Slack-Alternative zum Selbsthosten: Mattermost 1.0 in der Kurzvorstellung". t3n News (in German). Retrieved 2018-10-21.
  9. ^ "Mattermost - Open-Source-Alternative zu Slack". (in German). 2015-10-23. Retrieved 2018-10-21.
  10. ^ "Five Open-Source Slack Alternatives » okTurtles Blog". Retrieved 2018-10-21.
  11. ^ Shaw, Russley (2017-05-09). "Which Chat Platform Should I Use?". Russley Shaw. Retrieved 2018-10-21.
  12. ^ "GitLab Mattermost, an open source on-premises Slack alternative". GitLab. 2015-08-18. Retrieved 2018-10-21.
  13. ^ "GitLab acquires software chat startup Gitter, will open-source the code". VentureBeat. 2017-03-15. Retrieved 2018-10-21.