“A practical Slack replacement for teams with compliance or on-premises requirements.”
At a glance
| Replaces | Slack, Microsoft Teams |
|---|---|
| Open-source license | AGPL-3.0 / open core |
| Privacy | On-premises deployment keeps sensitive team data under organizational control. |
| Lightweight signal | Can consolidate chat and incident workflows in one controlled service. |
| Community health | Large company-backed project |
| Platforms | Web, Windows, macOS, Linux, Android, iOS |
On-premises deployment keeps sensitive team data under organizational control.
Can consolidate chat and incident workflows in one controlled service.
Large company-backed project. Verify current releases and open issues in the source repository before critical deployment.
Should you switch to Mattermost?
A practical Slack replacement for teams with compliance or on-premises requirements. A successful migration starts with a small real project, not a feature checklist. Test the files, integrations, shortcuts, and collaboration steps you use every week before removing the existing tool.
Open source gives you inspectable code and a path away from vendor lock-in, but it does not eliminate tradeoffs. Support may be community-led, some commercial file formats may be imperfect, and self-hosted options require security updates and backups. Use the official website and source repository above to confirm current compatibility.