Team chat
Mattermost
Self-hosted team chat used by security-conscious organisations.
proprietary self-hostable Mattermost Inc. · USChannels, threads, calls and playbooks; free to self-host, or cloud-hosted by the US company.
Website ↗ Source ↗ Plan “Team chat” with it
How you can run it
| Way | Where the data lives | Price basis | Verdict |
|---|---|---|---|
| Host it myself | your own server or hardware | free | green — You run it yourself: no data leaves your own infrastructure. |
| Hosted outside Europe | servers outside Europe | ≈ €9/mo per seat | red — Hosted outside Europe: your data sits under non-European jurisdiction. |
Facts
| Company / project | Mattermost Inc. (US) |
|---|---|
| Licence | proprietary |
| Self-hosting footprint | 1024 MB RAM · 1 vCPU · 5 GB — small deployment: a household or a team of up to ~20 people |
| Commonly replaces | Slack, Microsoft Teams |
| Upstream (awesome-selfhosted-data) | 38,978 stars · updated 2026-09-03 · Go, Docker, K8S |
| Provenance | curated, verified 2026-09-04 |
Machine-readable: /api/tools/mattermost.json. Something wrong? Tell us.