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Mattermost
mattermost · v6.3.1
3
8.0
Open-source, self-hosted Slack-alternative
brew install --cask mattermost 269
30-day installs
817
90-day installs
4.3K
365-day installs
Install trend
Trust Score 3/10
✗ Open source (NOASSERTION) +0
✗ Active development +0
✓ Licensed +1
✗ No auto-updates +0
✓ Not deprecated +1
✓ Established (>1yr) +1
✗ Low installs +0
Version History
v6.3.13d ago6.3.0→6.3.1
2mo ago6.2.2→6.3.0
3mo ago6.2.1→6.2.2
4mo ago6.2.0→6.2.1
5mo ago6.1.2→6.2.0
5mo ago6.1.0→6.1.2
Review
Mar 10, 2026Mattermost is an open-source, self-hosted alternative to Slack, offering secure communication and collaboration features. It's ideal for teams seeking control over their data and environment.
Mattermost provides a communication platform for teams to collaborate securely.
Maturity: The project is mature with active development and a strong community, though it has some open issues.
Community: Hacker News discussions highlight its strengths as an open-source Slack alternative but also mention issues like message limits.
Pros
- + Self-hosted for full control over data
- + Open-source with active community support
- + Customizable to meet specific needs
Cons
- - No auto-update feature
- - Message limits can be restrictive
Community Mentions
hackernews
hackernews
hackernews
hackernews
hackernews
Positive sentiment Negative sentiment Neutral / unknown