Open-source, self-hosted Slack alternative with channels, direct messages, threads, voice calls and bots.
Open sourceTechnical setup
Free alternative to
Code activity
- Stars
- 39,557
- Forks
- 9,093
- Open issues & PRs
- 1,106
- Last commit
- today
- Latest release
- 4 days ago
Details
- Type
- Open source
- Written in
- TypeScriptGoJavaScriptSCSS
- Platforms
- Self-hosted · Windows · Mac · Linux · Android · iPhone · Web
- Ease of use
- Technical setup
Pros
- Slack-like, with data on your company's servers
- Mobile apps
Cons
- You have to host the server yourself
- Some admin features are paid only
Use Mattermost instead of
SlackChannels, threads, voice calls and bots, with all data on your company's server and no 90-day history cap.
How is the 95/100 "Health" score calculated?
Dorabot computes it weekly from public GitHub data; it is not a review of software quality: 40 points for code freshness (a commit in the last 30 days earns full points), 25 points for popularity by stars, 20 points for a recent release, 15 points for the ratio of open issues to stars. 80+ is Good, 60–79 Fair, below 60 Weak.
FAQ
Is Mattermost free?
Yes. Mattermost is open source and free for personal and commercial use.
Which platforms does Mattermost run on?
Mattermost is available for self-hosting on your own server, Windows, Mac, Linux, Android, iPhone and Web.
What can I use Mattermost instead of?
Mattermost is a free alternative to Slack.
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