Mattermost
Reviewed by Alexis Morain · Updated July 26, 2026
Mattermost is an open-source, self-hostable team messaging tool, an alternative to Slack. Free plan, Professional at $10/user/month.
The most solid open-source, self-hostable alternative to Slack, ideal for organizations that require full control of their data, with a strong developer focus.
- Open source and self-hostable (data stays under control)
- Free Starter plan with unlimited users
- Self-hosting requires your own administration
Mattermost is an open-source messaging and collaboration platform, built to be self-hosted. It's the go-to alternative to Slack for organizations that want to keep control of their data, especially in tech, defense, and the public sector.
What is Mattermost used for?
Mattermost offers channel-based messaging, file sharing, calls, and strong integration with development tools (GitHub, GitLab, CI/CD). Its main draw: self-hosting, which lets you install the platform on your own servers, including in Europe, with full control over security and compliance. A workflows and playbooks layer also serves DevOps teams.
Mattermost or Slack?
Compared to Slack or Microsoft Teams, both closed SaaS, Mattermost bets on open source and sovereignty. Compared to Rocket.Chat or Zulip, other self-hostable solutions, it stands out for its enterprise robustness and developer focus. For anyone who requires conversations to stay on their own infrastructure, it's a solid choice.
How much does Mattermost cost?
The Starter plan is free when self-hosted, with unlimited users and history. The Professional plan costs $10/user/month (SSO, AD/LDAP, MFA), the same price in the cloud or self-hosted. The Enterprise and Enterprise Advanced offers are quote-based, with high availability, compliance exports, and 24/7 SLA.
Pros & Cons
- Open source and self-hostable (data stays under control)
- Free Starter plan with unlimited users
- Strong integration with development tools
- Can be hosted in Europe for compliance
- Self-hosting requires your own administration
- Less mainstream than Slack or Teams
- Enterprise features reserved for paid plans
Key features of Mattermost
Channel messaging
Conversations organized by team or project
Self-hosting
Installation on your own servers
Dev integrations
GitHub, GitLab, CI/CD, webhooks
Playbooks
Workflows for DevOps teams
Mattermost pricing
Mattermost's Starter plan is free when self-hosted, with unlimited users and history, making it a full messaging tool at no cost. The Professional plan costs $10/user/month (SSO, AD/LDAP, MFA), the same price in the cloud or self-hosted. The Enterprise and Enterprise Advanced offers are quote-based, with high availability, compliance exports, and 24/7 SLA.
Free plan / trial
Starter plan: full self-hosted messaging, with unlimited users and history, without enterprise features (SSO, AD/LDAP, MFA).
Starter
Unlimited users · Unlimited history · Full messaging
$0 self-hosted
Professional
SSO · AD/LDAP, MFA · Cloud or self-hosted
$10 per user/month
Enterprise
High availability · Compliance exports · 24/7 SLA
Custom pricing
Enterprise Advanced
Advanced security · Large organizations · Extended support
Custom pricing
Pricing verified on July 12, 2026
Try MattermostWho is Mattermost for?
Best for
- Organizations requiring control of their data
- Tech and DevOps teams
- Public sector and defense (sovereignty)
Not recommended for
- Small teams wanting a turnkey SaaS with no admin work
- Needing a mainstream tool with no infrastructure
Want to try Mattermost?
Head to the official site and the current offer.
Frequently asked questions about Mattermost
Is Mattermost free?▼
Mattermost or Slack?▼
Can Mattermost be hosted in Europe?▼
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