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Mattermost logo horizontal.svg
Mattermost UI.png
Developer(s)Mattermost Inc
Initial releaseOctober 2, 2015; 5 years ago (2015-10-02)
Stable release
Server5.36.0 / June 16, 2021; 0 days ago (2021-06-16)[1]
Mobile1.44.0 / June 16, 2021; 0 days ago (2021-06-16)[2]
Desktop4.6.2 / January 25, 2021; 4 months ago (2021-01-25)[3]
Repository Edit this at Wikidata
Written inGo,[4][5] JavaScript[6]
Available in16 languages
LicenseMIT License for "Mattermost Team Edition" Linux binary server compiled by Mattermost, Inc.,[7] AGPLv3 for uncompiled Mattermost server source code,[7] (Apache License 2.0 for Admin Tools and Configuration Files),[7] and Apache License 2.0 for the rest[8]

Mattermost is an open-source, self-hostable online chat service with file sharing, search, and integrations. It is designed as an internal chat for organisations and companies, and mostly markets itself as an open-source alternative to Slack[9][10] and Microsoft Teams.


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.[10] The 1.0 was released on October 2, 2015.[11]

The project is maintained and developed by Mattermost Inc.[12] 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.[13][14][15][16] It was also integrated into GitLab as "GitLab Mattermost",[17] although in 2017 GitLab acquired Gitter,[18] another popular chat tool. In 2021 GitLab sold Gitter.

Adoption among non-profits[edit]

Mattermost was adopted in the tech/non-profit sector that was in need to move away from limitations of corporate services, and praised for its bridging to IRC channels.[citation needed] It has been as default public channel by organizations like Coko Foundation since 2017,[19] but also tested for community use by Wikimedia as Wikimedia Chat on Wikimedia Cloud Services as of late summer 2020.[20]

See also[edit]


  1. ^ "Mattermost Changelog". Mattermost. Retrieved 2020-11-15.
  2. ^ "Releases". GitHub. Retrieved 2020-11-15.
  3. ^ "Releases". GitHub. Retrieved 2020-11-15.
  4. ^ Baker, Jason (2017-08-17). "5 open source alternatives to Slack for team chat". Retrieved 2019-04-12.
  5. ^ Henrique, Gustavo (2019-01-27). "10 tools written in Go that every developer needs to know • Gustavo Henrique". Gustavo Henrique. Retrieved 2019-04-12.
  6. ^ Finley, Klint (2016-03-16). "Open Sourcers Race to Build Better Versions of Slack". Wired. ISSN 1059-1028. Archived from the original on 2017-03-09. Retrieved 2019-07-15.
  7. ^ a b c "Mattermost's License". 2018-08-01. Retrieved 2018-12-16.
  8. ^ "Mattermost's License". 2018. Retrieved 2018-12-16.
  9. ^ Asay, Matt (2019-02-06). "How open source Mattermost is sneaking up on Slack's messaging empire". TechRepublic. Archived from the original on 2019-07-15. Retrieved 2019-07-15.
  10. ^ a b "Why we made Mattermost an open source Slack-alternative | Mattermost". Retrieved 2018-10-21.
  11. ^ "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.
  12. ^ "Crunchbase". Retrieved 2018-10-21.
  13. ^ "Quelloffene Slack-Alternative zum Selbsthosten: Mattermost 1.0 in der Kurzvorstellung". t3n News (in German). Retrieved 2018-10-21.
  14. ^ "Mattermost - Open-Source-Alternative zu Slack". (in German). 2015-10-23. Retrieved 2018-10-21.
  15. ^ "Five Open-Source Slack Alternatives » okTurtles Blog". Retrieved 2018-10-21.
  16. ^ Shaw, Russley (2017-05-09). "Which Chat Platform Should I Use?". Russley Shaw. Retrieved 2018-10-21.
  17. ^ "GitLab Mattermost, an open source on-premises Slack alternative". GitLab. 2015-08-18. Retrieved 2018-10-21.
  18. ^ "GitLab acquires software chat startup Gitter, will open-source the code". VentureBeat. 2017-03-15. Retrieved 2018-10-21.
  19. ^ "Getting Started with Coko". Coko. 2017-06-16. Retrieved 2021-03-06.
  20. ^ Sarabadani, Amir (2020-09-18). "Introducing Wikimedia Chat!". Diff. Retrieved 2021-03-06.

External links[edit]