Mattermost
App in the BluixApps catalog
What it is
Mattermost is the self-hosted Slack alternative built for organizations with security, sovereignty, or compliance constraints. Real-time messaging, channels, threads, file sharing, voice/video calls, integrated CI/CD playbooks, and a deep integration model — all running on your infrastructure.
Used by US Department of Defense, financial institutions, and regulated industries for the same reason European businesses pick it: data residency and on-prem control.
What it's for
- Internal team chat — drop-in Slack replacement, same workflow, your servers
- Cross-org collaboration — shared channels between organizations with full audit trail
- DevOps playbooks — incident response, on-call workflows, runbook execution from chat
- Compliance-bound communications — financial, healthcare, government use cases requiring data residency
- Air-gapped environments — defense, classified, isolated networks
Who it's for
- Defense & government teams under data residency mandates that prohibit US-based SaaS chat
- Financial services with PCI / SOC 2 / internal compliance needs on chat content + audit
- Healthcare orgs subject to HIPAA on internal communications; need verified residency + audit log
- DevOps teams wanting playbook-driven incident response with full Mattermost Playbooks integration
- Air-gapped industrial / OT environments — defense, energy, manufacturing where internet egress is restricted
Why teams pick Mattermost over alternatives
- Open source (MIT for the Team Edition core, commercial enterprise add-ons)
- Data sovereignty — full control of where messages live, who has access
- Compliance certifications — FedRAMP, HIPAA-ready, ISO 27001
- Slack-compatible workflow — easy team migration from Slack
- DevOps-native — playbooks, GitHub / Jenkins / Jira deep integrations
- Open API + webhooks for custom integrations
- Active LTS releases for production stability
Integrations
- DevOps tools — GitHub, GitLab, Jenkins, Jira, ServiceNow, PagerDuty, Datadog, Grafana
- Slack-compatible bots — most Slack bot APIs work with minimal adjustment
- Identity — OAuth (Google, GitHub, Microsoft), LDAP, SAML, AD integration
- Webhooks — bidirectional HTTP triggers for arbitrary external systems
- Voice + video — built-in WebRTC calls; Plugin Marketplace adds full conferencing
- File storage — S3-compatible object storage backend for messages and uploads
- E2E encryption — plugin (Enterprise tier) for highest-sensitivity rooms
Notable users & community
- 30k+ GitHub stars
- Production-deployed at US DoD, NASA, Samsung, financial regulators, EU government agencies
- Active forum + Discord + monthly community webinars; LTS support model for enterprise
- Public roadmap, predictable release cadence
- Backed by Mattermost Inc. (US-based) with strong open-core commercial sustainability
Tips & operations
- Use LTS branch in production — Team Edition LTS = 12+ months of security patches; mainline can have breaking changes
- Offload file storage to S3-compatible — local
filestore/grows fast; mount MinIO / S3 from day one for scale - Wire SMTP early — invite, password reset, notifications all silently break without it; common day-one stumble
- Set up push notification proxy — official
mattermost-mobileiOS / Android apps need the proxy to reach APNs/FCM - Postgres tuning —
max_connections >= 100for active teams; default100is OK for small but throttles at scale - Plugin Marketplace ON only behind RBAC — random users installing arbitrary plugins is a real risk; admin-gate it
What we ship in BluixApps
- Docker compose: Mattermost Team Edition + Postgres + email gateway
- Pinned
mattermost/mattermost-team-edition:9.11.0(LTS), tracking the LTS branch - HTTPS via Let's Encrypt — WebRTC / push notification endpoints correctly configured
- Admin user created via first-run wizard; we surface the initial setup URL in the install report
- File storage at
/mattermost/data— sized per VPS allocation, optional S3-compatible backend - Backup hook covers Postgres + file storage volume
Get this app — pick a BluixApps plan
Same catalog. Scaling tenant isolation, white-label and support tier.
| Tier | Tenants | Catalog | Support | White-label | Monthly | |
|---|---|---|---|---|---|---|
| Stacks | 1 | 19 curated stacks | Standard | — | $19/mo | DetailDeploy |
| Starter | 10 | Full catalog | Standard | +$15–25/mo | $49/mo | DetailDeploy |
| Pro | 25 | Full catalog | Priority bugfix | +$15–25/mo | $149/mo | DetailDeploy |
| Growth | 100 | Full catalog | Priority bugfix | +$15–25/mo | $349/mo | DetailDeploy |
| Scale | 500 | Full catalog | 7-day window | +$15–25/mo | $799/mo | DetailDeploy |
| Enterprise | Unlimited | Full catalog | Priority 7-day | Bundled | $1,499/mo | DetailDeploy |
