Mattermost
Self-hosted team messaging for developers
FreeOpen SourceOther7 impressions
Mattermost is a free alternative to Slack.
Mattermost is a self-hosted, secure team messaging and collaboration platform for mission-critical workflows.
- for
- Enterprises, government, and critical-infrastructure teams needing data sovereignty.
- pricing
- contact sales · free trial
- license
- open source
- v11.10.3-rc14 days ago
- v12.0.0-rc211 days ago
- v11.11.113 days ago
Key features
- Secure Messaging & Collaboration — Channel-based chat with searchable history, per-channel permissions, and priority messages.
- Workflow Automation — Playbook-driven incident response, change management and compliance with conditional checklists and SLA timers.
- Human-Machine Teaming — Sovereign AI agents that summarize alerts, act on them, and integrate with any LLM you choose.
- Audio & Screenshare — 1-to-1 and group calls with screen sharing, live transcription and AI summaries on your own calls server.
- Project Management Boards — Kanban, table, calendar and gallery boards linked to conversations for task tracking.
- Federation & Interoperability — Secure message federation across Mattermost servers and real-time bridges to Teams, Matrix and XMPP.
Use cases
- Secure incident response channels for security operations centers
- Air-gapped collaboration for classified government missions
- Real-time DevSecOps alerts and playbooks integrated with CI/CD tools
- Cross-agency project management with fine-grained access controls
Mattermost vs alternatives
 Slack |  Rocket.Chat |  Zulip | ||
|---|---|---|---|---|
| Best for | Zero-trust, air-gapped team collaboration | Teams happy with a hosted chat app | Self-hosted chat with omnichannel features | Topic-threaded team chat |
| Pricing | Contact sales | Subscription | Free | Free |
| DevHunt upvotes | 0 | 0 | 0 | 0 |
| Launched | — | — | — | — |
- Mattermost vs Slack: Slack is a hosted SaaS with a large app directory; Mattermost can be self-hosted.
- Mattermost vs Rocket.Chat: Rocket.Chat adds livechat and omnichannel inboxes; both are open source.
- Mattermost vs Zulip: Zulip threads every message by topic; Mattermost uses Slack-style channels.
Mattermost FAQ
Can Mattermost run in air-gapped environments?+
Yes, it supports fully disconnected installations for classified and restricted networks.
What AI models can I use with Mattermost agents?+
You can integrate any LLM you choose, including self-hosted models, via the bring-your-own-LLM feature.
How does Mattermost ensure data sovereignty?+
All data, models and keys remain on your infrastructure, whether on-prem, private cloud or sovereign public cloud.
Is there a trial available?+
Mattermost offers a 1-hour trial environment for technical evaluation.
What authentication methods are supported?+
SAML, LDAP/AD, SCIM provisioning, MFA with hardware keys and magic-link guest access.
Summarized by DevHunt from mattermost.com · Oct 4, 2026. Details may change; check the official site.
About this listing
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