Work · alternatives · 2026

24 alternatives to Mattermost

Open source, on-premises, Slack alternative

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

1. 1
   Mattermost 1.0▲219

   Open source Slack alternative

   2015 · mattermost.com · its alternatives →

2. 2
   Mattermost 1.0▲7

   Open Source Slack Alternative Reaches 1.0

   2015 · mattermost.com · its alternatives →

3. 3
   Matterwiki▲227

   A simple, beautiful, and open source wiki for teams

   2017 · nishantarora.org · its alternatives →

4. 4
   Matterhorn▲163

   Simple and light-weight project management tool

   2015 · matterhorn.io · its alternatives →

5. 5
   Slack▲85

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

   2014 · slack.com · its alternatives →

6. 6
   StackForest▲173

   A curated directory of tools and services for professionals.

   2017 · stackforest.com · its alternatives →

7. 7
   Matter▲185

   A new magazine built on Medium

   2014 · medium.com · its alternatives →

8. 8
   Slinky▲110

   Your slack links — organized!

   2016 · its alternatives →

9. 9
   Frontends▲93

   A community for front-end developers

   2014 · its alternatives →

10. 10
    Contentful▲108

    The API-driven CMS: Manage content once, publish it anywhere

    2014 · contentful.com · its alternatives →

11. 11
    Contentify▲70

    a real-time collaborative content manager on top of Github

    2014 · thyb.github.io · its alternatives →

12. 12
    Slack Gitsin▲115

    A beautiful Slack command line interface

    2016 · github.com · its alternatives →

13. 13
    Idealist▲202

    Keep track of your startup ideas

    2015 · apps.apple.com · its alternatives →

14. 14
    Lighthouse▲144

    Real-time monitoring and alerts for Slack administrators

    2016 · its alternatives →

15. 15
    Fustr▲144

    Discover new startups faster

    2017 · fustr.com · its alternatives →

16. 16
    Fosshub▲79

    An open source for free and open source tools

    2015 · fosshub.com · its alternatives →

17. 17
    Agora▲180

    Discover the most discussed ideas and issues on Slack 💡

    2017 · agora.co · its alternatives →

18. 18
    SlackCatchup▲134

    Catch up all the unread across your Slack teams in one place

    2016 · its alternatives →

19. 19
    Total.js Messenger▲181

    A small, open-source alternative to Slack

    2017 · totaljs.com · its alternatives →

20. 20
    Feedback Friday by Matter for Slack▲171

    Recognize teammates with Kudos, feedback, & rewards in Slack

    2021 · matterapp.com · its alternatives →

21. 21
    Limitless▲90

    A productivity companion for Chrome

    2013 · chromewebstore.google.com · its alternatives →

22. 22
    Hello Tech Pros: Getting Things Done with Slack, Todoist and YouTube▲58

    Francesco D'Alessio on Productivity

    2016 · gadgetsprimer.com · its alternatives →

23. 23
    HiveFlux + Slack▲93

    Real-time task management meets real-time communication

    2015 · blog.hiveflux.com · its alternatives →

24. 24
    Perma▲150

    A better way to get things done ✅

    2016 · per.ma · 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 →