Mattermost
February 22, 2026
What it is
Mattermost is team chat: channels, DMs, integrations, and file sharing. Self-hosted; optional SSO and compliance features.
Usage
Team communication; bots and integrations; threads and search; optional GitLab/Jira integrations; on-prem compliance.
Pros and cons
| Pros | Cons |
|---|---|
| Self-hosted, data ownership | Fewer integrations than Slack |
| Slack-like UX | Requires hosting and maintenance |
| SSO and compliance options | |
| Open source core |
Alternatives
Slack, Discord, Matrix. Why Mattermost: Self-hosted Slack alternative with control over data.
Links
- Homepage: https://mattermost.com/
- Documentation: https://docs.mattermost.com/
- Source: https://github.com/mattermost/mattermost