Work · alternatives · 2026

24 alternatives to Mattermost 1.0

Open Source Slack Alternative Reaches 1.0

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Mattermost 1.0 launched in 2015; newer entries below may have overtaken it.

1. 1
   Mattermost▲126

   Open source, on-premises, Slack alternative

   2015 · mattermost.com · its alternatives →

2. 2
   Mattermost 1.0▲219

   Open source Slack alternative

   2015 · mattermost.com · its alternatives →

3. 3
   Slack 4.0▲472

   A snappier, more efficient Slack desktop experience

   2019 · slack.com · its alternatives →

4. 4
   Slack▲85

   Be less busy. Real-time messaging, archiving & search.

   2014 · slack.com · its alternatives →

5. 5
   Feedback Friday by Matter for Slack▲171

   Recognize teammates with Kudos, feedback, & rewards in Slack

   2021 · matterapp.com · its alternatives →

6. 6
   Slack Overflow▲230

   A programmer's best friend, now in Slack.

   2015 · github.com · its alternatives →

7. 7
   Posts 2.0▲240

   Glorious paragraph creator from Slack

   2015 · its alternatives →

8. 8
   Slaask for Mobile▲86

   A Slack integration to "Slack" with your mobile users.

   2016 · get.slaask.com · its alternatives →

9. 9SM
   Slack Meets GitHub Issues▲373

   Last year I gave in to the temptation of doing my own startup and quit my job, just like many others have done on this site. Since then, I’ve severely changed my lifestyle and reduced my living costs to a crazy low figure and worked my ass off for the last 8 months to achieve this: www.openloopz.com I have written more about it on Medium here: http://goo.gl/JN03yf I knew from the start the odds were stacked against me. I’m almost 36, I have a family and I live in the North East of England where - without wanting to sound negative - the opportunities are few and far between…

   2015 · its alternatives →

10. 10
    Node.js Messenger▲140

    A small alternative to Slack

    2017 · totaljs.com · its alternatives →

11. 11
    Slack▲93

    Platform for team communication

    2015 · slack.com · its alternatives →

12. 12
    Slack It▲185

    A bookmarklet to share links in Slack with one click

    2015 · slackit.jazzychad.net · its alternatives →

13. 13
    Total.js Messenger▲181

    A small, open-source alternative to Slack

    2017 · totaljs.com · its alternatives →

14. 14
    Slack 2.0▲14

    New and improved Slack

    2016 · slack.com · its alternatives →

15. 15
    Paperbot (Reloaded)▲144

    Slack meets Pocket

    2016 · paperbot.ai · its alternatives →

16. 16
    Spaces▲133

    Slack's first acquisition: all-in-one documents for teams

    2014 · slack.com · its alternatives →

17. 17
    Kifi for Slack▲168

    Get links messaged on Slack in Google Search results

    2016 · kifi.com · its alternatives →

18. 18
    DiggBot for Slack▲140

    Discover the best of the web, right in Slack

    2016 · digg.com · its alternatives →

19. 19
    Slack Gitsin▲115

    A beautiful Slack command line interface

    2016 · github.com · its alternatives →

20. 20
    Slackiq▲61

    Slackiq integrates Slack and Sidekiq.

    2015 · github.com · its alternatives →

21. 21
    Suggestion Sam▲104

    A modern day suggestion box for Slack

    2016 · suggestionsam.com · its alternatives →

22. 22
    Radio Slack▲93

    Collaborative jukebox for Slack

    2016 · github.com · its alternatives →

23. 23
    Slinky▲110

    Your slack links — organized!

    2016 · its alternatives →

24. 24
    GoSquared & Slack▲143

    Traffic spikes and user notifications sent straight to Slack

    2015 · gosquared.com · its alternatives →

Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →